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Chen Y, Ma Y, Qin J, Wei X, Yang Y, Yuan Y, Yan F, Huo X, Han L. Blood pressure variability predicts poor outcomes in acute stroke patients without thrombolysis: a systematic review and meta-analysis. J Neurol 2024; 271:1160-1169. [PMID: 38036920 DOI: 10.1007/s00415-023-12054-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 10/07/2023] [Accepted: 10/09/2023] [Indexed: 12/02/2023]
Abstract
BACKGROUND Stroke is a significant medical condition, and blood pressure stands out as the most prevalent treatable risk factor associated with it. Researches link blood pressure variability (BPV) with stroke; however, the specific relationship between with the outcomes of stroke patients remains unclear. As blood pressure variability and mean blood pressure are interrelated, it remains uncertain whether BPV adds additional information to understanding the outcome of acute stroke patients. OBJECTIVE To systematically review studies investigating the association between blood pressure variability and prognosis in acute stroke patients. METHODS Embase, PubMed, Web of Science, and the Cochrane Library were searched for English language full-text articles from the inception to 1 January 2023. Stroke patients aged ≥ 18 years were included in this analysis. Stroke types were not restricted. RESULTS This meta-analysis shows that higher systolic blood pressure variability is linked to a higher risk of poor outcome, including function disability, mortality, early neurological deterioration, and stroke recurrence, among acute stroke patients without thrombolysis. A higher diastolic blood pressure variability is linked with to a higher risk of mortality and functional disability. CONCLUSIONS This review reveals that blood pressure variability is a novel and clinically relevant risk factor for stroke patients' outcome. Future studies should investigate how best to measure and define BPV in acute stroke. Larger studies are warranted to provide more robust evidence in this area.
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Affiliation(s)
- Yajing Chen
- Evidence-Based Nursing Centre, School of Nursing, Lanzhou University, Lanzhou, Gansu Province, China
| | - Yuxia Ma
- Evidence-Based Nursing Centre, School of Nursing, Lanzhou University, Lanzhou, Gansu Province, China.
- The First Clinical Medical College of Lanzhou University, Lanzhou, 730030, Gansu Province, China.
| | - Jiangxia Qin
- Evidence-Based Nursing Centre, School of Nursing, Lanzhou University, Lanzhou, Gansu Province, China
| | - Xiaoqin Wei
- Evidence-Based Nursing Centre, School of Nursing, Lanzhou University, Lanzhou, Gansu Province, China
| | - Yiyi Yang
- Evidence-Based Nursing Centre, School of Nursing, Lanzhou University, Lanzhou, Gansu Province, China
| | - Yue Yuan
- Evidence-Based Nursing Centre, School of Nursing, Lanzhou University, Lanzhou, Gansu Province, China
| | - Fanghong Yan
- Evidence-Based Nursing Centre, School of Nursing, Lanzhou University, Lanzhou, Gansu Province, China
| | - Xiaoning Huo
- The Third People's Hospital of Lanzhou, No.130 Jianlan New Village, Lanzhou, Gansu Province, China
| | - Lin Han
- Evidence-Based Nursing Centre, School of Nursing, Lanzhou University, Lanzhou, Gansu Province, China.
- Department of Nursing, Gansu Provincial Hospital, No. 204 Donggang West Road, Lanzhou, Gansu Province, China.
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Nayak A, S B A, Bardhan M, Rashmi R, Arunachal G, Prathyusha P, Nalini A, Sathyaprabha T, Udupa K. Evaluation of Cardiac, Autonomic Functions in Ambulant Patients with Duchenne Muscular Dystrophy. SN COMPREHENSIVE CLINICAL MEDICINE 2023; 5:138. [PMID: 37193318 PMCID: PMC10160717 DOI: 10.1007/s42399-023-01473-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/19/2023] [Indexed: 05/18/2023]
Abstract
Duchenne muscular dystrophy (DMD) is an X-linked genetic disorder caused by dystrophin gene mutation resulting in muscle weakness, motor delays, difficulty in standing, and inability to walk by 12 years. As disease progresses, it leads to cardiac and respiratory failure. Evaluation of cardiac autonomic status and echocardiography in DMD patients at a young age can be a potential biomarker to assess disease progression. This study aimed to investigate the younger DMD population of 5-11years of age with mild to moderate cardiac involvement for early detection using non-invasive and cost-effective tools. Genetically confirmed male DMD patients, aged 5-11 years (n = 47), screened from the outpatient department of a tertiary neuroscience institution were subjected to heart rate variability and echocardiographic analysis, and values were correlated with their clinical variables. DMD patients showed a significantly higher difference in HR, interventricular septum, E m/s, and E-wave to A-wave (E/A) ratio than normal values (p < 0.001). Significantly higher HR indicates initial sinus tachycardia and decreased IVD (d), and increased E m/s and E/A ratio mark the onset of cardiac symptoms in DMD patients even though its chamber dimension remains normal and are associated with cardiac muscle fibrosis.
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Affiliation(s)
- Amritharekha Nayak
- Department of Neurophysiology, National Institute of Mental Health And Neurosciences (NIMHANS), Hosur Road, Bengaluru, 560029 India
| | - Apoorva S B
- Department of Neurophysiology, National Institute of Mental Health And Neurosciences (NIMHANS), Hosur Road, Bengaluru, 560029 India
| | - Mainak Bardhan
- Department of Neurology, National Institute of Mental Health And Neurosciences (NIMHANS), Bengaluru, 560029 India
| | - R. Rashmi
- Department of Neurophysiology, National Institute of Mental Health And Neurosciences (NIMHANS), Hosur Road, Bengaluru, 560029 India
| | - G. Arunachal
- Department of Human Genetics, National Institute of Mental Health And Neurosciences (NIMHANS), Bengaluru, 560029 India
| | - P.V. Prathyusha
- Department of Biostatistics, National Institute of Mental Health And Neurosciences (NIMHANS), Bengaluru, 560029 India
| | - Atchayaram Nalini
- Department of Neurology, National Institute of Mental Health And Neurosciences (NIMHANS), Bengaluru, 560029 India
| | - T.N. Sathyaprabha
- Department of Neurophysiology, National Institute of Mental Health And Neurosciences (NIMHANS), Hosur Road, Bengaluru, 560029 India
| | - Kaviraja Udupa
- Department of Neurophysiology, National Institute of Mental Health And Neurosciences (NIMHANS), Hosur Road, Bengaluru, 560029 India
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Schumann A, Gaser C, Sabeghi R, Schulze PC, Festag S, Spreckelsen C, Bär KJ. Using machine learning to estimate the calendar age based on autonomic cardiovascular function. Front Aging Neurosci 2023; 14:899249. [PMID: 36755773 PMCID: PMC9899796 DOI: 10.3389/fnagi.2022.899249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 12/20/2022] [Indexed: 01/24/2023] Open
Abstract
Introduction Aging is accompanied by physiological changes in cardiovascular regulation that can be evaluated using a variety of metrics. In this study, we employ machine learning on autonomic cardiovascular indices in order to estimate participants' age. Methods We analyzed a database including resting state electrocardiogram and continuous blood pressure recordings of healthy volunteers. A total of 884 data sets met the inclusion criteria. Data of 72 other participants with an BMI indicating obesity (>30 kg/m²) were withheld as an evaluation sample. For all participants, 29 different cardiovascular indices were calculated including heart rate variability, blood pressure variability, baroreflex function, pulse wave dynamics, and QT interval characteristics. Based on cardiovascular indices, sex and device, four different approaches were applied in order to estimate the calendar age of healthy subjects, i.e., relevance vector regression (RVR), Gaussian process regression (GPR), support vector regression (SVR), and linear regression (LR). To estimate age in the obese group, we drew normal-weight controls from the large sample to build a training set and a validation set that had an age distribution similar to the obesity test sample. Results In a five-fold cross validation scheme, we found the GPR model to be suited best to estimate calendar age, with a correlation of r=0.81 and a mean absolute error of MAE=5.6 years. In men, the error (MAE=5.4 years) seemed to be lower than that in women (MAE=6.0 years). In comparison to normal-weight subjects, GPR and SVR significantly overestimated the age of obese participants compared with controls. The highest age gap indicated advanced cardiovascular aging by 5.7 years in obese participants. Discussion In conclusion, machine learning can be used to estimate age on cardiovascular function in a healthy population when considering previous models of biological aging. The estimated age might serve as a comprehensive and readily interpretable marker of cardiovascular function. Whether it is a useful risk predictor should be investigated in future studies.
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Affiliation(s)
- Andy Schumann
- Lab for Autonomic Neuroscience, Imaging and Cognition (LANIC), Department of Psychosomatic Medicine and Psychotherapy, Jena University Hospital, Jena, Germany
| | - Christian Gaser
- Hans Berger Department of Neurology, Jena University Hospital, Jena, Germany
- Department of Psychiatry and Psychotherapy, Jena University Hospital, Jena, Germany
| | - Rassoul Sabeghi
- Lab for Autonomic Neuroscience, Imaging and Cognition (LANIC), Department of Psychosomatic Medicine and Psychotherapy, Jena University Hospital, Jena, Germany
| | - P. Christian Schulze
- Department of Internal Medicine I, Division of Cardiology, Jena University Hospital, Jena, Germany
| | - Sven Festag
- Institute of Medical Statistics, Computer and Data Sciences, Jena University Hospital, Jena, Germany
- SMITH Consortium of the German Medical Informatics Initiative, Leipzig, Germany
| | - Cord Spreckelsen
- Institute of Medical Statistics, Computer and Data Sciences, Jena University Hospital, Jena, Germany
- SMITH Consortium of the German Medical Informatics Initiative, Leipzig, Germany
| | - Karl-Jürgen Bär
- Lab for Autonomic Neuroscience, Imaging and Cognition (LANIC), Department of Psychosomatic Medicine and Psychotherapy, Jena University Hospital, Jena, Germany
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Voss A, Bogdanski M, Walther M, Langohr B, Albrecht R, Seifert G, Sandbothe M. Mindfulness-Based Student Training Improves Vascular Variability Associated With Sustained Reductions in Physiological Stress Response. Front Public Health 2022; 10:863671. [PMID: 35923955 PMCID: PMC9340219 DOI: 10.3389/fpubh.2022.863671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 06/17/2022] [Indexed: 11/13/2022] Open
Abstract
In today's fast-paced society, chronic stress has become an increasing problem, as it can lead to psycho-physiological health problems. University students are also faced with stress due to the demands of many courses and exams. The positive effects of mindfulness-based stress reduction (MBSR) on stress management and self-regulation have already been studied. We have developed a new mindfulness intervention tailored for students—the Mindfulness-Based Student Training (MBST). In this study, we present longitudinal results of the MBST evaluation. Biosignal analysis methods, including pulse wave variability (PWV), heart rate variability, and respiratory activity, were used to assess participants' state of autonomic regulation during the 12-week intervention and at follow-up. The progress of the intervention group (IGR, N = 31) up to 3 months after the end of MBST was compared with that of a control group (CON, N = 34). In addition, the long-term effect for IGR up to 1 year after intervention was examined. The analysis showed significant positive changes in PWV exclusively for IGR. This positive effect, particularly on vascular function, persists 1 year after the end of MBST. These results suggest a physiologically reduced stress level in MBST participants and a beneficial preventive health care program for University students.
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Affiliation(s)
- Andreas Voss
- Institute of Innovative Health Technologies (IGHT), Ernst-Abbe-Hochschule Jena, Jena, Germany
- Institute of Biomedical Engineering and Informatics (BMTI), Technische Universität Ilmenau, Ilmenau, Germany
- Department of Pediatric Oncology and Hematology, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- *Correspondence: Andreas Voss
| | - Martin Bogdanski
- Institute of Innovative Health Technologies (IGHT), Ernst-Abbe-Hochschule Jena, Jena, Germany
- Department of Pediatric Oncology and Hematology, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Mario Walther
- Department of Basic Sciences, Ernst-Abbe-Hochschule Jena, Jena, Germany
| | | | - Reyk Albrecht
- Department of Social and Behavioral Sciences and Department of Medicine, Friedrich-Schiller-University Jena, Jena, Germany
| | - Georg Seifert
- Department of Pediatric Oncology and Hematology, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Departamento de Pediatria, Faculdade de Medicina, Instituto de Tratamento Do Câncer Infatil (ITACI) Universidade de São Paulo, São Paulo, Brazil
| | - Mike Sandbothe
- Institute of Innovative Health Technologies (IGHT), Ernst-Abbe-Hochschule Jena, Jena, Germany
- Department of Social Work, Ernst-Abbe-Hochschule Jena, Jena, Germany
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Adeoye AM, Adebusoye LA, Fakunle AG, Aderonmu OI, Adebayo OM, Michael OS, Adetona MO, Thrift AG, Olaiya MT, Owolabi MO. Day and night blood pressure variability among older persons in South-Western Nigeria. Niger Postgrad Med J 2022; 29:206-213. [PMID: 35900456 DOI: 10.4103/npmj.npmj_24_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
BACKGROUND Hypertension is the largest contributor to the global burden of disease. Emerging risk factors for cardiovascular disease include blood pressure variability (BPV), but evidence on BPV is lacking among older Nigerians. We reported BPV in a cohort of older persons at the University College Hospital (UCH), Ibadan. METHODS We conducted a retrospective cohort study of respondents aged >50 years within the Ibadan Ambulatory Blood Pressure Registry at the UCH, Ibadan, Nigeria. Socio-demographic characteristics, lifestyle habits and anthropometric measurements were obtained. RESULTS Among 639 respondents, 332 (52.0%) were female. The blood pressure (BP) variables were strongly associated with age. Compared with younger age groups, mean diastolic BP (DBP) was less at an older age, whereas mean pulse pressure was greater. During the wake-up and sleep periods, mean DBP and mean arterial BP were less with each increasing age category, whereas mean pulse pressure was larger with each increasing age category. BP dipping, systolic, diastolic and mean arterial BP decreased with age. Overall, timed BPV increased significantly with increasing age. The prevalence of white-coat hypertension was greater among older participants than younger participants. Most respondents in the 50-59 years' age group were non-dippers (55.8%), whereas 33.7% of older respondents were reverse-dippers. CONCLUSION Older persons experienced a greater abnormal circadian blood variation and greater BPV than younger people. In Nigeria, follow-up data are needed to determine the prognostic significance of these data in this population.
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Affiliation(s)
| | | | | | | | | | - Obaro S Michael
- Department of Pharmacology and Therapeutic, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | | | - Amanda G Thrift
- Department of Medicine, School of Clinical Sciences at Monash Health, Monash University, Melbourne, Australia
| | - Muideen T Olaiya
- Department of Medicine, School of Clinical Sciences at Monash Health, Monash University, Melbourne, Australia
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Asmuje NF, Mat S, Myint PK, Tan MP. Blood Pressure Variability and Cognitive Function: a Scoping Review. Curr Hypertens Rep 2022; 24:375-383. [PMID: 35731334 DOI: 10.1007/s11906-022-01200-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2022] [Indexed: 11/03/2022]
Abstract
PURPOSE OF REVIEW To conduct a scoping review of articles which have evaluated BPV and cognitive function. Articles with keywords, titles or abstracts containing the terms 'cognitive' OR 'cognition' OR 'dementia' AND 'blood pressure variability' were identified from CINAHL, Medline, PMC and Web of Science. RECENT FINDINGS Methods of acquisition and analysis of BPV and cognitive measurements and their relationship were extracted from selected articles. Of 656 studies identified, 53 articles were selected. Twenty-five evaluated long-term (LTBPV), nine mid-term (MTBPV), 12 short-term (STBPV) and nine very short-term BPV (VSTBPV) with conflicting findings on the relationship between BPV and cognition. Variations existed in devices, period and procedure for acquisition. The studies also utilized a wide range of methods of BPV calculation. Thirteen cognitive assessment tools were used to measure global cognition or domain functions which were influenced by the population of interest. The interpretation of available studies was hence limited by heterogeneity. There is an urgent need for standardization of BPV assessments to streamline research on BPV and cognition. Future studies should also establish whether BPV could be a potential modifiable risk factor for cognitive decline, as well as a marker for treatment response.
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Affiliation(s)
- Nur Fazidah Asmuje
- Kolej Genius Insan, Universiti Sains Islam Malaysia, Negeri Sembilan, Malaysia. .,Ageing and Age-Associated Disorders Research Group, Department of Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia.
| | - Sumaiyah Mat
- Physiotherapy Programme and Center of Healthy Ageing and Wellness, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Bangi, Malaysia
| | - Phyo Kyaw Myint
- Ageing Clinical & Experimental Research (ACER) Team, Institute of Applied Health Sciences, University of Aberdeen, Aberdeen, UK.,Department of Medicine for the Elderly, NHS Grampian, Aberdeen Royal Infirmary, Aberdeen, UK
| | - Maw Pin Tan
- Ageing and Age-Associated Disorders Research Group, Department of Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia. .,Centre for Innovations in Medical Engineering, University of Malaya, Kuala Lumpur, Malaysia. .,Department of Medical Sciences, Faculty of Healthcare and Medical Sciences, Sunway University, Bandar Sunway, Malaysia.
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7
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Teixeira AL, Nardone M, Samora M, Fernandes IA, Ramos PS, Sabino-Carvalho JL, Ricardo DR, Millar PJ, Vianna LC. Potentiation of GABAergic synaptic transmission by diazepam acutely increases resting beat-to-beat blood pressure variability in young adults. Am J Physiol Regul Integr Comp Physiol 2022; 322:R501-R510. [PMID: 35348021 DOI: 10.1152/ajpregu.00291.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Resting beat-to-beat blood pressure variability is a powerful predictor of cardiovascular events and end-organ damage. However, its underlying mechanisms remain unknown. Herein, we tested the hypothesis that a potentiation of GABAergic synaptic transmission by diazepam would acutely increase resting beat-to-beat blood pressure variability. In 40 (17 females) young, normotensive subjects, resting beat-to-beat blood pressure (finger photoplethysmography) was continuously measured for 5 to 10 min, 60 min after the oral administration of either diazepam (10 mg) or placebo. The experiments were conducted in a randomized, double-blinded, and placebo-controlled design. Stroke volume was estimated from the blood pressure waveform (ModelFlow) permitting the calculation of cardiac output and total peripheral resistance. Direct recordings of muscle sympathetic nerve activity (MSNA, microneurography) were obtained in a subset of subjects (N=13) and spontaneous cardiac and sympathetic baroreflex sensitivity calculated. Compared to placebo, diazepam significantly increased the standard deviation of systolic (4.7±1.4 vs. 5.7±1.5 mmHg, P=0.001), diastolic (3.8±1.2 vs. 4.5±1.2 mmHg, P=0.007) and mean blood pressure (3.8±1.1 vs. 4.5±1.1 mmHg, P=0.002), as well as cardiac output (469±149 vs. 626±259 ml/min, P<0.001) and total peripheral resistance (1.0±0.3 vs. 1.4±0.6 mmHg/l/min, P<0.001). Similar results were found using different indices of variability. Furthermore, diazepam reduced MSNA burst frequency (placebo: 22±6 vs. diazepam: 18±8 bursts/min, P=0.025) without affecting the arterial baroreflex control of heart rate (placebo: 18.6±6.7 vs. diazepam: 18.8±7.0 ms/mmHg, P=0.87) and MSNA (placebo: -3.6±1.2 vs. diazepam: -3.4±1.5 bursts/100Hb/mmHg, P=0.55). These findings suggest that GABAA receptors modulate resting beat-to-beat blood pressure variability in young adults.
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Affiliation(s)
- André L Teixeira
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.,NeuroVASQ - Integrative Physiology Laboratory, Faculty of Physical Education, University of Brasília, Brasília, DF, Brazil
| | - Massimo Nardone
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Milena Samora
- NeuroVASQ - Integrative Physiology Laboratory, Faculty of Physical Education, University of Brasília, Brasília, DF, Brazil
| | - Igor Alexandre Fernandes
- NeuroVASQ - Integrative Physiology Laboratory, Faculty of Physical Education, University of Brasília, Brasília, DF, Brazil
| | - Plinio Santos Ramos
- Maternity Hospital Therezinha de Jesus, Faculty of Health and Medical Sciences (SUPREMA), Juiz de Fora, MG, Brazil
| | - Jeann L Sabino-Carvalho
- NeuroVASQ - Integrative Physiology Laboratory, Faculty of Physical Education, University of Brasília, Brasília, DF, Brazil
| | - Djalma Rabelo Ricardo
- Maternity Hospital Therezinha de Jesus, Faculty of Health and Medical Sciences (SUPREMA), Juiz de Fora, MG, Brazil
| | - Philip J Millar
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Lauro C Vianna
- NeuroVASQ - Integrative Physiology Laboratory, Faculty of Physical Education, University of Brasília, Brasília, DF, Brazil
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Liu Y, Luo X, Jia H, Yu B. The Effect of Blood Pressure Variability on Coronary Atherosclerosis Plaques. Front Cardiovasc Med 2022; 9:803810. [PMID: 35369353 PMCID: PMC8965230 DOI: 10.3389/fcvm.2022.803810] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 02/18/2022] [Indexed: 12/17/2022] Open
Abstract
Hypertension is one of the most important risk factors for coronary heart disease (CHD). The regulation of blood pressure plays a significant role in the development and prognosis of CHD. Blood pressure variability (BPV) refers to the degree of fluctuation of blood pressure over a period of time and is an important indicator of blood pressure stability. Blood pressure fluctuations are complex physiological phenomena, being affected by physiological and pharmacological effects and regulated by behavioral, environmental, hydrodynamic, and neural factors. According to the different time periods for measuring BPV, it can be divided into very short-term, short-term, mid-term, and long-term. Multiple cardiovascular disease animal models and clinical experiments have consistently indicated that abnormal BPV is closely related to coronary events and is a risk factor for CHD independently of average blood pressure. Thrombosis secondary to plaque rupture (PR) or plaque erosion can cause varying blood flow impairment, which is the main pathological basis of CHD. Plaque morphology and composition can influence the clinical outcome, treatment, and prognosis of patients with CHD. Research has shown that PR is more easily induced by hypertension. After adjusting for the traditional factors associated with plaque development, in recent years, some new discoveries have been made on the influence of abnormal BPV on the morphology and composition of coronary plaques and related mechanisms, including inflammation and hemodynamics. This article reviews the impact of BPV on coronary plaques and their related mechanisms, with a view to prevent the occurrence and development of CHD by controlling BPV and to provide new prevention and treatment strategies for the clinical treatment of abnormal blood pressure.
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Affiliation(s)
- Yue Liu
- Department of Cardiology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, China
| | - Xing Luo
- Department of Cardiology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, China
| | - Haibo Jia
- Department of Cardiology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, China
- *Correspondence: Haibo Jia
| | - Bo Yu
- Department of Cardiology, 2nd Affiliated Hospital of Harbin Medical University, Harbin, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, China
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9
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Xiao LY, Li Z, Du YZ, Shi HY, Yang SQ, Zhang YX, Li RY, Lin WL, Wang HY, Dai XY. Acupuncture for Hypertension in Animal Models: A Systematic Review and Meta-Analysis. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2021; 2021:8171636. [PMID: 34671411 PMCID: PMC8523269 DOI: 10.1155/2021/8171636] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Revised: 08/16/2021] [Accepted: 09/07/2021] [Indexed: 12/09/2022]
Abstract
OBJECTIVE The aim of this study was to summarize and evaluate the efficacy of acupuncture in hypertension animal study. METHODS Studies were searched from six databases, including Medline, Embase, Chinese National Knowledge Infrastructure, Wanfang Data, VIP information database, and Chinese Biomedical Literature Database. Study quality of each included study was evaluated according to the Animal Research: Reporting of In Vivo Experiments (ARRIVE) guidelines, and the risk of bias was evaluated by the Systematic Review Centre for Laboratory Animal Experimentation (SYRCLE) tool. Systolic blood pressure (SBP), diastolic blood pressure (DBP), and mean arterial pressure (MAP) were selected as outcomes. Meta-analyses were performed using Stata 12.0 software. The effect size was calculated by combining SBP/DBP/MAP data with the random effects model, respectively. RESULTS 67 studies containing 1522 animals were included. According to the ARRIVE guideline, 8 items were assessed as poor and 4 items were assessed as excellent. According to the SYRCLE tool, all studies were judged as having high risk of bias. Compared with the hypertension group, the pooled results showed significant antihypertension effects of acupuncture for SBP, DBP, and MAP. Similarly, compared with the sham-acupuncture group, the pooled results showed significant antihypertension effects of acupuncture for SBP, DBP, and MAP. CONCLUSION Although pooled data suggested that the acupuncture group was superior to the hypertension group or sham-acupuncture group for SBP/DBP/MAP, the presentation of poor methodological quality, high risk of bias, and heterogeneity deserves cautious interpretation of the results.
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Affiliation(s)
- Ling-Yong Xiao
- Clinical Department of Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
- National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin 300193, China
| | - Zheng Li
- Affiliated Zhongshan Hospital of Dalian University, Dalian 116001, China
| | - Yu-Zheng Du
- Clinical Department of Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
- National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin 300193, China
| | - Hui-Yan Shi
- Clinical Department of Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
- National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin 300193, China
| | - Si-Qi Yang
- Clinical Department of Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
- National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin 300193, China
| | - Yue-Xin Zhang
- Clinical Department of Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
- National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin 300193, China
| | - Rui-Yu Li
- Clinical Department of Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
- National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin 300193, China
| | - Wan-Ling Lin
- Clinical Department of Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
- National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin 300193, China
| | - He-Yang Wang
- Clinical Department of Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
- National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin 300193, China
| | - Xiao-Yu Dai
- Clinical Department of Acupuncture and Moxibustion, First Teaching Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
- National Clinical Research Center for Chinese Medicine Acupuncture and Moxibustion, Tianjin 300193, China
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Rivera AL, Estañol B, Macias-Gallardo JJ, Delgado-Garcia G, Fossion R, Frank A, Torres-Villalobos GM. Cardiovascular dysautonomia in Achalasia Patients: Blood pressure and heart rate variability alterations. PLoS One 2021; 16:e0248106. [PMID: 33720957 PMCID: PMC7959365 DOI: 10.1371/journal.pone.0248106] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 02/20/2021] [Indexed: 01/11/2023] Open
Abstract
Achalasia is a disease characterized by the inability to relax the esophageal sphincter due to a degeneration of the parasympathetic ganglion cells located in the wall of the thoracic esophagus. Achalasia has been associated with extraesophageal dysmotility, suggesting alterations of the autonomic nervous system (ANS) that extend beyond the esophagus. The purpose of the present contribution is to investigate whether achalasia may be interpreted as the esophageal manifestation of a more generalized disturbance of the ANS which includes alterations of heart rate and/or blood pressure. Therefore simultaneous non-invasive records of the heart inter-beat intervals (IBI) and beat-to-beat systolic blood pressure (SBP) of 14 patients (9 female, 5 male) with achalasia were compared with the records of 34 rigorously screened healthy control subjects (17 female, 17 male) in three different conditions: supine, standing up, and controlled breathing at 0.1 Hz, using a variety of measures in the time and spectral domains. Significant differences in heart rate variability (HRV) and blood pressure variability (BPV) were observed which seem to be due to cardiovagal damage to the heart, i.e., a failure of the ANS, as expected according to our hypothesis. This non-invasive methodology can be employed as an auxiliary clinical protocol to study etiology and evolution of achalasia, and other pathologies that damage ANS.
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Affiliation(s)
- Ana Leonor Rivera
- Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacan, Mexico City, Mexico
- Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacan, Mexico City, Mexico
- * E-mail:
| | - Bruno Estañol
- Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacan, Mexico City, Mexico
- Department of Neurology and Psychiatry and Clinical Neurophysiology Laboratory, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Tlalpan, Mexico City, Mexico
| | - Julio J. Macias-Gallardo
- Department of Neurology and Psychiatry and Clinical Neurophysiology Laboratory, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Tlalpan, Mexico City, Mexico
| | | | - Ruben Fossion
- Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacan, Mexico City, Mexico
- Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacan, Mexico City, Mexico
| | - Alejandro Frank
- Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacan, Mexico City, Mexico
- Centro de Ciencias de la Complejidad, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacan, Mexico City, Mexico
- El Colegio Nacional, Centro Histórico, Mexico City, Mexico
| | - Gonzalo M. Torres-Villalobos
- Department of Experimental Surgery, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Tlalpan, Mexico City, Mexico
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Coconut Oil Supplementation Does Not Affect Blood Pressure Variability and Oxidative Stress: A Placebo-Controlled Clinical Study in Stage-1 Hypertensive Patients. Nutrients 2021; 13:nu13030798. [PMID: 33670999 PMCID: PMC7997205 DOI: 10.3390/nu13030798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 02/16/2021] [Accepted: 02/24/2021] [Indexed: 12/11/2022] Open
Abstract
Exploring an alternative to improve the clinical management of hypertension, we tested the hypothesis that food supplementation with coconut oil (EVCO), alone or combined with aerobic exercise training, could exert an antihypertensive effect (primary outcome) in patients with stage 1 hypertension. Forty-five hypertensive volunteers of both genders participated in a placebo-controlled clinical trial. The volunteers were submitted to 24-hour ambulatory blood pressure monitoring, analysis of blood pressure variability (BPV), measurement of serum malondialdehyde (MDA) and nutritional assessment. Results indicate that EVCO consumption had no adverse effects. The supplementation did not increase the caloric intake compared with placebo, and the dietary constituents were similar between groups, except for the saturated fats, especially lauric acid. The analysis of blood pressure indicated absence of antihypertensive effect of EVCO alone or combined with physical training. Furthermore, no effects on blood pressure variability and oxidative stress were observed in the supplemented hypertensive patients. Thus, despite the results observed in pre-clinical studies, the current clinical study did not provide evidence to support the use of coconut oil as an adjuvant in the management of hypertension in humans.
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Saladini F, Fania C, Mos L, Vriz O, Mazzer A, Spinella P, Garavelli G, Ermolao A, Rattazzi M, Palatini P. Short-Term but not Long-Term Blood Pressure Variability Is a Predictor of Adverse Cardiovascular Outcomes in Young Untreated Hypertensives. Am J Hypertens 2020; 33:1030-1037. [PMID: 32710778 DOI: 10.1093/ajh/hpaa121] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 07/10/2020] [Accepted: 07/22/2020] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Whether blood pressure variability (BPV) measured with ambulatory monitoring (short-term BPV) or computed from office visits (long-term BPV) are related to each other and carry similar prognostic information is not well known. We investigated the independent determinants of short-term and long-term BPVs and their predictive capacity for the development of major adverse cardiovascular and renal events (MACEs) in a cohort of young hypertensive participants. METHODS Long-term BPV was calculated as visit-to-visit SD and average real variability from office blood pressure (BP) measured during 7 visits, within 1 year. Short-term BPV was calculated as weighted 24-hour SD and coefficient of variation. Hazard ratios (HRs) for risk of MACE were computed from multivariable Cox regressions. RESULTS 1,167 participants were examined; mean age was 33.1 ± 8.5 years. Variables independently associated with 24-hour systolic SD were 24-hour systolic BP, low physical activity, smoking, baseline office pulse pressure, systolic BP dipping, and diastolic white coat effect, while those associated with long-term BPV were mean systolic BP, age, female gender, and baseline office heart rate. During a median follow-up of 17.4 years 75 MACEs occurred. In Cox analysis only short-term BPV resulted a significant predictor of MACE (HR, 1.31 (1.07-1.59); P = 0.0086), while no index of long-term BPV was independently associated with outcome. CONCLUSIONS In young hypertensive subjects only short-term BPV resulted a significant predictor of MACE on top of traditional ambulatory BP monitoring parameters. Whether reduction of short-term BPV with therapy may reduce the cardiovascular risk independently from the effects on 24-hour BP is a matter for future research.
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Affiliation(s)
- Francesca Saladini
- Department of Medicine, University of Padova, Padova, Italy
- Department of Cardiology, Cittadella Town Hospital, Padova, Italy
| | - Claudio Fania
- Department of Medicine, University of Padova, Padova, Italy
| | - Lucio Mos
- Department of Cardiology, San Daniele del Friuli Town Hospital, Udine, Italy
| | - Olga Vriz
- Department of Cardiology, San Daniele del Friuli Town Hospital, Udine, Italy
| | - Andrea Mazzer
- Department of Medicine, Vittorio Veneto Town Hospital, Treviso, Italy
| | - Paolo Spinella
- Department of Medicine, University of Padova, Padova, Italy
| | - Guido Garavelli
- Department of Medicine, Cremona Town Hospital, Cremona, Italy
| | - Andrea Ermolao
- Department of Medicine, University of Padova, Padova, Italy
| | | | - Paolo Palatini
- Department of Medicine, University of Padova, Padova, Italy
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13
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K Dolu A, Korkmaz A, Kundi H, Guray U. Whole blood viscosity predicts nondipping circadian pattern in essential hypertension. Biomark Med 2020; 14:1307-1316. [DOI: 10.2217/bmm-2020-0249] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: We aimed to investigate the association between whole blood viscosity (WBV) and nondipping pattern in patients with essential hypertension. Materials & methods: A total of consecutive 530 patients who had been evaluated by ambulatory blood pressure monitoring were included. WBV was estimated by using hematocrit and plasma total protein levels for both WBV in low shear rate (0.5 s-1) and WBV in high shear rate (208 s-1) according to the de Simone’s formula. Results: In the multivariate analysis, low shear rate and high shear rate of WBV were associated independently with nondipping pattern in patients with essential hypertension. Conclusion: As a simple, inexpensive and noninvasive tool, WBV seems to be a significant predictor of nondipping hypertension.
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Affiliation(s)
- Abdullah K Dolu
- Department of Cardiology, İzmir Katip Çelebi University Ataturk Training and Research Hospital, Izmir, 35360, Turkey
| | - Ahmet Korkmaz
- Department of Cardiology, Ankara City Hospital, Health Sciences University, Ankara, 06800, Turkey
| | - Harun Kundi
- Richard A. and Susan F. Smith Center for Outcomes Research in Cardiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Umit Guray
- Department of Cardiology, Ankara City Hospital, Health Sciences University, Ankara, 06800, Turkey
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14
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Lee JW, Choi E, Son JW, Youn YJ, Ahn SG, Ahn MS, Kim JY, Lee SH, Yoon J, Ryu DR, Park SM, Hong KS, Yoo BS. Comparison of Blood Pressure Variability Between Losartan and Amlodipine in Essential Hypertension (COMPAS-BPV). Am J Hypertens 2020; 33:748-755. [PMID: 32267481 DOI: 10.1093/ajh/hpaa060] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 03/14/2020] [Accepted: 04/07/2020] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Antihypertensive therapy using renin-angiotensin system blockers and calcium channel blockers to target blood pressure variability (BPV) has not yet been established. We aimed to compare the ability of losartan and amlodipine to lower BPV and systolic blood pressure (SBP) in essential hypertensive patients. METHODS Patients were randomly assigned either losartan 50 mg or amlodipine 5 mg. Medications were uptitrated and hydrochlorothiazide was added according to protocol for 6 months. The primary endpoint was the office visit-to-visit SD of SBP. The secondary endpoints included average real variability (ARV), office SBP, and home SBP. RESULTS The losartan group (n = 71) and amlodipine group (n = 73) finished the scheduled visits between April 2013 and May 2017. The office visit-to-visit SD of SBP was comparable between the losartan and amlodipine groups (11.0 ± 4.2 vs. 10.5 ± 3.8, P = 0.468). The office visit-to-visit ARV of SBP was significantly elevated in the losartan group (10.6 ± 4.3 vs. 9.1 ± 3.4, P = 0.02). The absolute SBP decrement from baseline to 6 months was similar between groups, although the office mean SBP at 6 months was higher in the losartan group (132.3 ± 12.9 vs. 127.5 ± 9.0 mm Hg, P = 0.011). In home blood pressure analysis, evening day-to-day BPV indexes (SD and ARV) were significantly higher in the losartan group at 6 months. CONCLUSIONS The lowering effect of the office visit-to-visit SD of SBP was similar between losartan and amlodipine. However, the losartan group showed a higher office visit-to-visit ARV of SBP and evening day-to-day home BPV indexes. Therefore, amlodipine may be better to lower BPV in essential hypertensive patients.
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Affiliation(s)
- Jun-Won Lee
- Division of Cardiology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital, Wonju, Republic of Korea
| | - Eunhee Choi
- Department of Medicine, Smith Center for Outcomes Research in Cardiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Jung-Woo Son
- Division of Cardiology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital, Wonju, Republic of Korea
| | - Young Jin Youn
- Division of Cardiology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital, Wonju, Republic of Korea
| | - Sung-Gyun Ahn
- Division of Cardiology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital, Wonju, Republic of Korea
| | - Min-Soo Ahn
- Division of Cardiology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital, Wonju, Republic of Korea
| | - Jang-Young Kim
- Division of Cardiology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital, Wonju, Republic of Korea
| | - Seung-Hwan Lee
- Division of Cardiology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital, Wonju, Republic of Korea
| | - Junghan Yoon
- Division of Cardiology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital, Wonju, Republic of Korea
| | - Dong Ryeol Ryu
- Department of Internal Medicine, Kangwon National University College of Medicine, Chuncheon, Republic of Korea
| | - Sang-Min Park
- Division of Cardiology, Cardiovascular Center, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Republic of Korea
| | - Kyung-Soon Hong
- Division of Cardiology, Cardiovascular Center, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Republic of Korea
| | - Byung-Su Yoo
- Division of Cardiology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital, Wonju, Republic of Korea
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15
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Gmitrov J. Static Magnetic Field Versus Systemic Calcium Channel Blockade Effect on Microcirculation: Possible Mechanisms and Clinical Implementation. Bioelectromagnetics 2020; 41:447-457. [DOI: 10.1002/bem.22272] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 05/03/2020] [Accepted: 05/18/2020] [Indexed: 01/13/2023]
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16
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James GD. The Adaptive Value and Clinical Significance of Allostatic Blood Pressure Variation. Curr Hypertens Rev 2020; 15:93-104. [PMID: 30827251 PMCID: PMC6635646 DOI: 10.2174/1573402115666190301144316] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 12/26/2018] [Accepted: 02/20/2019] [Indexed: 01/08/2023]
Abstract
In recent years, there has been interest in evaluating the morbidity and mortality risk of circadian, diurnal, or noctur-nal blood pressure variation. Variation is a normative property of blood pressure, necessary for survival. Like many physio-logical functions, blood pressure undergoes allostasis, meaning that the body does not defend a particular blood pressure value, but rather blood pressure maintains bodi-ly stability through continual change that is initiated by constantly fluctuating internal and external environmental stimuli. Be-cause of its allostatic and adaptive properties, the blood pressure response to unusual situations like a visit to the clinic can lead to misdiagnosis of hypertension. However, blood pressure variation is mostly ignored when evaluating hypertension, which is an arbitrary dichotomy. Whether variation is indicative of pathology should be determined by assessing its appro-priateness for the circumstance, which requires quantification of the sources and extent of normative blood pressure respons-es to everyday living. These responses will vary among populations due to evolutionary genetic differences. The incon-sistency of reports regarding aspects of ambulatory blood pressure variation as cardiovascular risk factors likely results from the fact that the measures used do not reflect the actual nature of blood pressure allostasis.
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Affiliation(s)
- Gary D James
- Department of Anthropology, Decker School of Nursing and Department of Biomedical Engineering, Binghamton University, Binghamton, NY 13902, United States
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17
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Tuning mitochondrial structure and function to criticality by fluctuation-driven mechanotransduction. Sci Rep 2020; 10:407. [PMID: 31941960 PMCID: PMC6962425 DOI: 10.1038/s41598-019-57301-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Accepted: 12/28/2019] [Indexed: 01/11/2023] Open
Abstract
Cells in vascular walls are exposed to blood pressure variability (BPV)-induced cycle-by-cycle fluctuations in mechanical forces which vary considerably with pathology. For example, BPV is elevated in hypertension but reduced under anesthesia. We hypothesized that the extent of mechanical fluctuations applied to vascular smooth muscle cells (VSMCs) regulates mitochondrial network structure near the percolation transition, which also influences ATP and reactive oxygen species (ROS) production. We stretched VSMCs in culture with cycle-by-cycle variability in area strain ranging from no variability (0%), as in standard laboratory conditions, through abnormally small (6%) and physiological (25%) to pathologically high (50%) variability mimicking hypertension, superimposed on 0.1 mean area strain. To explore how oxidative stress and ATP-dependent metabolism affect mitochondria, experiments were repeated in the presence of hydrogen peroxide and AMP-PNP, an ATP analog and competitive inhibitor of ATPases. Physiological 25% variability maintained activated mitochondrial cluster structure at percolation with a power law distribution and exponent matching the theoretical value in 2 dimensions. The 25% variability also maximized ATP and minimized cellular and mitochondrial ROS production via selective control of fission and fusion proteins (mitofusins, OPA1 and DRP1) as well as through stretch-sensitive regulation of the ATP synthase and VDAC1, the channel that releases ATP into the cytosol. Furthermore, pathologically low or high variability moved mitochondria away from percolation which reduced the effectiveness of the electron transport chain by lowering ATP and increasing ROS productions. We conclude that normal BPV is required for maintaining optimal mitochondrial structure and function in VSMCs.
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18
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Tamuli D, Kaur M, Boligarla A, Jaryal AK, Srivastava AK, Deepak KK. Depressed baroreflex sensitivity from spontaneous oscillations of heart rate and blood pressure in SCA1 and SCA2. Acta Neurol Scand 2019; 140:350-358. [PMID: 31343735 DOI: 10.1111/ane.13151] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 06/20/2019] [Accepted: 07/21/2019] [Indexed: 12/31/2022]
Abstract
OBJECTIVES To assess the time and frequency domain measures of cardiac autonomic activity/tone in patients of genetically defined spinocerebellar ataxia (SCA) types 1 and 2, as well as to decipher the probable associations among the cardiovascular autonomic parameters and genetic and clinical characteristics. MATERIALS AND METHODS Simultaneous 5-min recording of RR interval (RRI) and blood pressure (BP) for the calculation of heart rate variability (HRV), blood pressure variability (BPV) and baroreflex sensitivity (BRS) were performed in genotypically confirmed SCA1 (n = 31) and SCA2 (n = 40) patients and healthy controls (n = 40). Additionally, the International Cooperative Ataxia Rating Scale (ICARS) was used for scoring of clinical severity in SCA patients. RESULTS Time and frequency domain parameters of HRV, BPV and BRS were depressed in SCA1 and SCA2 subtypes as compared to controls, although there was no statistically significant difference in autonomic tone between the two SCA subtypes. On correlation analysis, autonomic tone parameters were found to be associated with the clinical and genetic features of the SCA subtypes. Also, ICARS was associated with the genotype (CAG repeat length) in SCA2 patents. CONCLUSIONS Cardiac autonomic tone is depressed in both SCA1 and 2 as compared to healthy controls while the two SCA subtypes do not differ in terms of autonomic tone. Also, a typical association exists between disease characteristics and autonomic indices.
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Affiliation(s)
- Dibashree Tamuli
- Department of Physiology All India Institute of Medical Sciences New Delhi India
| | - Manpreet Kaur
- Department of Physiology VMMC & Safdarjung Hospital New Delhi India
| | - Anasuya Boligarla
- Department of Physiology All India Institute of Medical Sciences New Delhi India
| | - Ashok K. Jaryal
- Department of Physiology All India Institute of Medical Sciences New Delhi India
| | - Achal K. Srivastava
- Department of Neurology All India Institute of Medical Sciences New Delhi India
| | - Kishore K. Deepak
- Department of Physiology All India Institute of Medical Sciences New Delhi India
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Short-term blood pressure variability outweighs average 24-h blood pressure in the prediction of cardiovascular events in hypertension of the young. J Hypertens 2019; 37:1419-1426. [DOI: 10.1097/hjh.0000000000002074] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Xu L, Huang J, Zhang Z, Qiu J, Guo Y, Zhao H, Cai Z, Huang X, Fan Y, Xu Y, Ma J, Wu W. Bioinformatics Study on Serum Triglyceride Levels for Analysis of a Potential Risk Factor Affecting Blood Pressure Variability. Curr Bioinform 2019. [DOI: 10.2174/1574893614666190109152809] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Objective:
The purpose of this study was to establish whether Triglycerides (TGs) are
related to Blood Pressure (BP) variability and whether controlling TG levels leads to better BP
variability management and prevents Cardiovascular Disease (CVD).
Methods:
In this study, we enrolled 106 hypertensive patients and 80 non-hypertensive patients.
Pearson correlation and partial correlation analyses were used to define the relationships between
TG levels and BP variability in all subjects. Patients with hypertension were divided into two subgroups
according to TG level: Group A (TG<1.7 mmol/L) and Group B (TG>=1.7 mmol/L). The
heterogeneity between the two subgroups was compared using t tests and covariance analysis.
Results:
TG levels and BP variability were significantly different between the hypertensive and
non-hypertensive patients. Two-tailed Pearson correlation tests showed that TG levels are positively
associated with many BP variability measures in all subjects. After reducing other confounding
factors, the partial correlation analysis revealed that TG levels are still related to the Standard Deviation
(SD), Coefficient of Variation (CV) of nighttime systolic blood pressure and CV of
nighttime diastolic blood pressure, respectively (each p<0.05). In the subgroups, group A had a
lower SD of nighttime Systolic Blood Pressure (SBP_night_SD; 11.39±3.80 and 13.39±4.16,
p=0.011), CV of nighttime systolic blood pressure (SBP_night_CV; 0.09±0.03 and 0.11±0.03,
p=0.014) and average real variability of nighttime systolic blood pressure (SBP_night_ARV;
10.99±3.98 and 12.6±3.95, p=0.024) compared with group B, even after adjusting for age and other
lipid indicators.
Conclusion:
TG levels are significantly associated with BP variability and hypertriglyceridemia,
which affects blood pressure variability before causing target organ damage.
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Affiliation(s)
- Lin Xu
- Department of Cardiology, Guangzhou General Hospital of Guangzhou Military Region, Guangzhou 510010, China
| | - Jiangming Huang
- Guangdong Provincial Armed Police Corps Hospital Guangzhou 510010, China
| | - Zhe Zhang
- Department of Cardiology, Guangzhou General Hospital of Guangzhou Military Region, Guangzhou 510010, China
| | - Jian Qiu
- Department of Cardiology, Guangzhou General Hospital of Guangzhou Military Region, Guangzhou 510010, China
| | - Yan Guo
- Department of Cardiology, Guangzhou General Hospital of Guangzhou Military Region, Guangzhou 510010, China
| | - Hui Zhao
- Department of Cardiology, Guangzhou General Hospital of Guangzhou Military Region, Guangzhou 510010, China
| | - Zekun Cai
- Department of Cardiology, Guangzhou General Hospital of Guangzhou Military Region, Guangzhou 510010, China
| | - Xiaomin Huang
- Department of Cardiology, Guangzhou General Hospital of Guangzhou Military Region, Guangzhou 510010, China
| | - Yongwang Fan
- Department of Cardiology, Guangzhou General Hospital of Guangzhou Military Region, Guangzhou 510010, China
| | - Yehao Xu
- Department of Cardiology, Guangzhou General Hospital of Guangzhou Military Region, Guangzhou 510010, China
| | - Jun Ma
- Department of Cardiology, Guangzhou General Hospital of Guangzhou Military Region, Guangzhou 510010, China
| | - Wanqing Wu
- The School of Biomedical Engineering, Sun Yat-Sen University, Guanzhou 510275, China
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Kilic A, Baydar O. The relationship between diurnal blood pressure abnormalities and target organ damage in normotensive subjects. Which is more important? Increased blood pressure levels or circadian blood pressure abnormalities. Clin Exp Hypertens 2019; 42:244-249. [PMID: 31122073 DOI: 10.1080/10641963.2019.1619757] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Objective: Circadian blood pressure (CBP) abnormalities are well-known risk factors for many diseases such as cardiovascular, cerebrovascular, and chronic kidney disease. The object of this study was to evaluate the relationship between abnormalities in CBP rhythm and target organ damage (TOD) in normotensive non-dipper (non-DP) subjects.Methods: The 24-h ambulatory BP monitoring (ABPM) and echocardiography were performed and urinary albumin excretion (UAE) was measured in 127 normotensive dipper (DP) (42 males, 85 females) and 337 (89 males, 248 females) normotensive non-DP subjects.Results: When we compared DP and non-DP subjects; Pulse wave velocity (PWV) (7.12 ± 1.72 vs 7.57 ± 1.87 m/s, p = 0.02), the percentile of corrected PWV (cPWV) (7.1 vs. 20.2, p= 0.001) and the percentile of corrected augmentation index (cAIx) (23.5 vs. 33.9, p = 0.03), left ventricle mass index (LVMI) (78.00 ± 23.27 vs. 95.59 ± 18.29 g/m2, p = 0.01), relative wall thickness (RWT)(0.36 ± 0.13 vs 0.46 ± 0.09, p = 0.01), percentile of proteinuria (8.6 vs 29.2%, p = 0.00) were higher in non-DP group. In the correlation analyses, the PWV, LVMI, RWT were negatively correlated with the rate of systolic fall in nighttime (%)(-0.15, p = 0.01 vs. -0.23, p = 0.02 vs. -0.27, p = 0.00). It was observed that cPWV, cAIx, and UAE were independently associated with age and non-DP status (NDS), in logistic regression analysis.Conclusions: Our results suggested that normotensive persons with CBP abnormalities had TOD. In light of the data of this article, non-dipper status is detected in the early period and if the provision of diurnal blood pressure rhythm may reduce the incidence of future adverse events in nondipper normotensive subjects.
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Affiliation(s)
- Alparslan Kilic
- Department of Cardiology, Koc University Hospital, Istanbul, Turkey
| | - Onur Baydar
- Department of Cardiology, Koc University Hospital, Istanbul, Turkey
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Radha M, de Groot K, Rajani N, Wong CCP, Kobold N, Vos V, Fonseca P, Mastellos N, Wark PA, Velthoven N, Haakma R, Aarts RM. Estimating blood pressure trends and the nocturnal dip from photoplethysmography. Physiol Meas 2019; 40:025006. [DOI: 10.1088/1361-6579/ab030e] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Labile hypertension: a new disease or a variability phenomenon? J Hum Hypertens 2019; 33:436-443. [PMID: 30647464 DOI: 10.1038/s41371-018-0157-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Revised: 11/03/2018] [Accepted: 12/17/2018] [Indexed: 11/08/2022]
Abstract
Blood pressure (BP) is a physiological parameter with short- and long-term variability caused by complex interactions between intrinsic cardiovascular (CV) mechanisms and extrinsic environmental and behavioral factors. Available evidence suggests that not only mean BP values are important, but also BP variability (BPV) might contribute to CV events. Labile hypertension (HTN) is referred to sudden rises in BP and it seems to be linked with unfavorable outcomes. The aim of this article was to review and summarize recent evidence on BPV phenomenon, unraveling the labile HTN concept along with the prognostic value of these conditions.
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Zhang L, Yang J, Li L, Liu D, Xie X, Dong P, Lin Y. Comparison of amlodipine versus other calcium channel blockers on blood pressure variability in hypertensive patients in China: a retrospective propensity score-matched analysis. J Comp Eff Res 2018; 7:651-660. [PMID: 29888950 DOI: 10.2217/cer-2017-0063] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Aim: Reducing the fluctuation of blood pressure has recently been recognized as a potential target for improving management of hypertension to prevent cardiovascular events, particularly for strokes. Some randomized controlled trials demonstrated that amlodipine can effectively reduce blood pressure as a well-established, long-acting calcium channel blocker (CCB). However, few data are available for amlodipine on blood pressure variability (BPV) in China in a real-world setting. This study aimed to assess the effect of amlodipine versus other CCB antihypertensive agents on BPV. Materials & methods: A retrospective propensity score-matched analysis was conducted, which retrieved the encounter data from 5582 hypertensive inpatients (with a median age of 69, female percentage of 48%, diastolic blood pressure ≥40 and <150 mmHg; systolic blood pressure (SBP) ≥70 mmHg and <260 mmHg), who had taken at least one antihypertensive agent and completed at least three SBP measurements during the visit. International Classification of Diseases was used to identify the hypertensive patients. BPV was calculated with standard deviation (SD) and coefficient of variation (CV) of SBP during a single inpatient visit. The Propensity Score Matching was used to balance the cohort of patients prescribed amlodipine or other CCBs. A series of appropriate statistical tests were applied to the propensity score-matched samples to examine the different effects on BPV. Additionally, the hypertensive patients with comorbidity such as coronary artery disease, diabetes mellitus, myocardial infarction, heart failure and chronic kidney disease were analyzed. Results: For the hypertensive patients (n = 1756, for each cohort), patients prescribed amlodipine showed lower BPV than patients prescribed other CCBs (12.90 vs 13.76 mmHg, p < 0.05 [SD] and 9.47 vs 10.06, p < 0.05 [CV]). For the hypertensive patients with comorbidity (n = 1080, for each cohort), patients prescribed amlodipine had lower BPV than patients prescribed other CCBs as well (13.24 vs 14.23 mmHg, p < 0.05 [SD] and 9.66 vs 10.28, p < 0.05 [CV]). Conclusion: amlodipine was associated with lower BPV than other CCBs for both hypertensive patients and hypertensive patients with comorbidity.
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Affiliation(s)
- Lin Zhang
- Department of Endocrinology, Beijing TongRen Hospital, Capital Medical University, Beijing, PR China
| | - JinKui Yang
- Department of Endocrinology, Beijing TongRen Hospital, Capital Medical University, Beijing, PR China
| | - LanTing Li
- Shanghai Palan DataRx Co. Ltd, Shanghai, PR China
| | | | | | - Peng Dong
- Pfizer Investment Co. Ltd, Beijing, PR China
| | - Yong Lin
- Shanghai Palan DataRx Co. Ltd, Shanghai, PR China
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Chadachan VM, Ye MT, Tay JC, Subramaniam K, Setia S. Understanding short-term blood-pressure-variability phenotypes: from concept to clinical practice. Int J Gen Med 2018; 11:241-254. [PMID: 29950885 PMCID: PMC6018855 DOI: 10.2147/ijgm.s164903] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Clinic blood pressure (BP) is recognized as the gold standard for the screening, diagnosis, and management of hypertension. However, optimal diagnosis and successful management of hypertension cannot be achieved exclusively by a handful of conventionally acquired BP readings. It is critical to estimate the magnitude of BP variability by estimating and quantifying each individual patient's specific BP variations. Short-term BP variability or exaggerated circadian BP variations that occur within a day are associated with increased cardiovascular events, mortality and target-organ damage. Popular concepts of BP variability, including "white-coat hypertension" and "masked hypertension", are well recognized in clinical practice. However, nocturnal hypertension, morning surge, and morning hypertension are also important phenotypes of short-term BP variability that warrant attention, especially in the primary-care setting. In this review, we try to theorize and explain these phenotypes to ensure they are better understood and recognized in day-to-day clinical practice.
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Affiliation(s)
| | - Min Tun Ye
- Department of Pharmacy, National University of Singapore, Singapore
| | - Jam Chin Tay
- Department of General Medicine, Tang Tock Seng Hospital
| | - Kannan Subramaniam
- Global Medical Affairs, Asia-Pacific Region, Pfizer Australia, Sydney, NSW, Australia
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Wang X, Wang F, Chen M, Wang X, Zheng J, Qin A. Twenty-four-hour systolic blood pressure variability and renal function decline in elderly male hypertensive patients with well-controlled blood pressure. Clin Interv Aging 2018; 13:533-540. [PMID: 29670339 PMCID: PMC5894670 DOI: 10.2147/cia.s161752] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Purpose Increased variability in blood pressure (BP) is known to be closely associated with the development, progression and severity of renal damage in patients with chronic kidney disease. However, little is known about the association of BP variability (BPV) with the decline of renal function in elderly hypertensive patients with well-controlled BP. We, therefore, aimed to investigate the association between BPV and glomerular filtration rate in hypertensive elderly (age >60 years) and very elderly (age >80 years) male patients with BP controlled within the normal range by antihypertensive therapy. Patients and methods This study involved 484 hospitalized elderly male hypertensive patients with BP controlled within the normal range by antihypertensive therapy. BPV was defined as the SD from mean BP over a 24 h period. Renal function was estimated by estimated glomerular filtration rate (eGFR) which was calculated by the Chinese modified Modification of Diet in Renal Disease Equation. Participants were divided into three groups according to their eGFR data. Multivariate linear regression was then used to analyze the correlation between eGFR and BPV. Results The 24 h systolic BP (SBP) variability increased as eGFR decreased. There was no significant difference in 24 h SBP variability when compared between elderly and very elderly hypertensive patients. Multivariate linear regression analysis showed that SBP variability demonstrated a negative linear relationship with eGFR (P<0.05) after adjustment for potential confounding factors. Conclusion Among the parameters of 24 h ambulatory BP monitoring, 24 h SBP variability is the only independent risk factor for a decline in renal function in elderly and very elderly male hypertensive patients with well-controlled BP.
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Affiliation(s)
- Xi Wang
- Department of Geriatric Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Fan Wang
- Department of Geriatric Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Minzhi Chen
- Department of Geriatric Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Xiaona Wang
- Department of Geriatric Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Jin Zheng
- Department of Geriatric Cardiology, Chinese PLA General Hospital, Beijing, China
| | - Aimei Qin
- Department of Geriatric Cardiology, Chinese PLA General Hospital, Beijing, China
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Resistance Exercise Can Modify Cardiovascular Responses of Professors During Teaching and Sleep. Asian J Sports Med 2018. [DOI: 10.5812/asjsm.67657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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The underlying risks of circadian blood pressure variation for carotid plaque in treated hypertensive patients with normal blood pressure. Blood Press Monit 2018; 22:191-195. [PMID: 28257292 DOI: 10.1097/mbp.0000000000000253] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
OBJECTIVES The aim of this study was to investigate the relationship between 24 h variation of blood pressure (BP) and carotid plaque in essential hypertensive patients with normal BP under anti-hypertensive treatment. PARTICIPANTS AND METHODS A total of 322 hypertensive patients with systolic BP (SBP) and diastolic BP (DBP) within the normal range after routine treatment were continuously recruited and evaluated by ambulatory BP monitoring from 1 January 2014 to 31 July 2015. The exclusion criteria included participants younger than 18 or older than 90 years of age, pregnancy, night-work employment, and suffering from secondary hypertension. The prevalence of carotid plaque between different circadian BP pattern groups was analyzed using a χ-test. Logistic regression was applied to analyze the relationship between carotid plaque and ambulatory BP monitoring variables. RESULTS All the individuals were divided into a 'carotid plaque' group (n=197) and a 'non-plaque' group (n=125) on the basis of whether the thickness of each plaque was at least 0.5 mm under the carotid ultrasound. In addition, patients were grouped into a dipper (10-20% nocturnal fall of BP in SBP) group and a nondipper (<10% nocturnal fall of BP in SBP) group on the basis of individual SBP variation. In the nondipper group, the number of patients with carotid plaque was higher than the patients without plaque (P=0.017). Logistic analysis showed that the nondipper pattern of BP was significantly associated with the formation of carotid plaque (odds ratio=1.731, P=0.041). CONCLUSION A nondipper pattern of BP may serve as a risk factor for carotid plaque in treated hypertensive individuals with normal BP.
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Complexity of preoperative blood pressure dynamics: possible utility in cardiac surgical risk assessment. J Clin Monit Comput 2018; 33:31-38. [PMID: 29564751 DOI: 10.1007/s10877-018-0133-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 03/17/2018] [Indexed: 10/17/2022]
Abstract
Complexity measures are intended to assess the cardiovascular system's capacity to respond to stressors. We sought to determine if decreased BP complexity is associated with increased estimated risk as obtained from two standard instruments: the Society of Thoracic Surgeons' (STS) Risk of Mortality and Morbidity Index and the European System for Cardiac Operative Risk Evaluation Score (EuroSCORE II). In this observational cohort study, preoperative systolic, diastolic, mean (MAP) and pulse pressure (PP) time series were derived in 147 patients undergoing cardiac surgery. The complexity of the fluctuations of these four variables was quantified using multiscale entropy (MSE) analysis. In addition, the traditional time series measures, mean and standard deviation (SD) were also computed. The relationships between time series measures and the risk indices (after logarithmic transformation) were then assessed using nonparametric (Spearman correlation, rs) and linear regression methods. A one standard deviation change in the complexity of systolic, diastolic and MAP time series was negatively associated (p < 0.05) with the STS and EuroSCORE indices in both unadjusted (21-34%) and models adjusted for age, gender and SD of the BP time series (15-31%). The mean and SD of BP time series were not significantly associated with the risk index except for a positive association with the SD of the diastolic BP. Lower preoperative BP complexity was associated with a higher estimated risk of adverse cardiovascular outcomes and may provide a novel approach to assessing cardiovascular risk. Future studies are needed to determine whether dynamical risk indices can improve current risk prediction tools.
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Tsang S, Sperling SA, Park MH, Helenius IM, Williams IC, Manning C. Blood Pressure Variability and Cognitive Function Among Older African Americans: Introducing a New Blood Pressure Variability Measure. Cogn Behav Neurol 2018; 30:90-97. [PMID: 28926416 DOI: 10.1097/wnn.0000000000000128] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Although blood pressure (BP) variability has been reported to be associated with cognitive impairment, whether this relationship affects African Americans has been unclear. We sought correlations between systolic and diastolic BP variability and cognitive function in community-dwelling older African Americans, and introduced a new BP variability measure that can be applied to BP data collected in clinical practice. METHODS We assessed cognitive function in 94 cognitively normal older African Americans using the Mini-Mental State Examination (MMSE) and the Computer Assessment of Mild Cognitive Impairment (CAMCI). We used BP measurements taken at the patients' three most recent primary care clinic visits to generate three traditional BP variability indices, range, standard deviation, and coefficient of variation, plus a new index, random slope, which accounts for unequal BP measurement intervals within and across patients. RESULTS MMSE scores did not correlate with any of the BP variability indices. Patients with greater diastolic BP variability were less accurate on the CAMCI verbal memory and incidental memory tasks. Results were similar across the four BP variability indices. CONCLUSIONS In a sample of cognitively intact older African American adults, BP variability did not correlate with global cognitive function, as measured by the MMSE. However, higher diastolic BP variability correlated with poorer verbal and incidental memory. By accounting for differences in BP measurement intervals, our new BP variability index may help alert primary care physicians to patients at particular risk for cognitive decline.
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Affiliation(s)
- Siny Tsang
- *Department of Epidemiology, Columbia University, New York, New York Departments of †Neurology and §Medicine, and ∥School of Nursing, University of Virginia, Charlottesville, Virginia ‡Department of Neurology, Korea University College of Medicine, Seoul, Republic of Korea
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Devroe S, Meeusen R, Gewillig M, Cools B, Poesen K, Sanders R, Rex S. Xenon as an adjuvant to sevoflurane anesthesia in children younger than 4 years of age, undergoing interventional or diagnostic cardiac catheterization: A randomized controlled clinical trial. Paediatr Anaesth 2017; 27:1210-1219. [PMID: 28872734 DOI: 10.1111/pan.13230] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 08/02/2017] [Indexed: 12/20/2022]
Abstract
BACKGROUND Xenon has repeatedly been demonstrated to have only minimal hemodynamic side effects when compared to other anesthetics. Moreover, in experimental models, xenon was found to be neuroprotective and devoid of developmental neurotoxicity. These properties could render xenon attractive for the anesthesia in neonates and infants with congenital heart disease. However, experience with xenon anesthesia in children is scarce. AIMS We hypothesized that in children undergoing cardiac catheterization, general anesthesia with a combination of sevoflurane with xenon results in superior hemodynamic stability, compared to sevoflurane alone. METHODS In this prospective, randomized, single-blinded, controlled clinical trial, children with a median age of 12 [IQR 3-36] months undergoing diagnostic/interventional cardiac catheterization were randomized to either general anesthesia with 50-65vol% xenon plus sevoflurane or sevoflurane alone. The primary outcome was the incidence of intraprocedural hemodynamic instability, defined as the occurrence of: (i) a heart rate change >20% from baseline; or (ii) a change in mean arterial blood pressure >20% from baseline; or (iii) the requirement of vasopressors, inotropes, chronotropes, or fluid boluses. Secondary endpoints included recovery characteristics, feasibility criteria, and safety (incidence of emergence agitation and postoperative vomiting. RESULTS After inclusion of 40 children, the trial was stopped as an a priori planned blinded interim analysis revealed that the overall rate of hemodynamic instability did not differ between groups [100% in both the xenon-sevoflurane and the sevoflurane group. However, the adjuvant administration of xenon decreased vasopressor requirements, preserved better cerebral oxygen saturation, and resulted in a faster recovery. Xenon anesthesia was feasible (with no differences in the need for rescue anesthetics in both groups). CONCLUSION Our observations suggest that combining xenon with sevoflurane in preschool children is safe, feasible, and facilitates hemodynamic management. Larger and adequately powered clinical trials are warranted to investigate the impact of xenon on short- and long-term outcomes in pediatric anesthesia.
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Affiliation(s)
- Sarah Devroe
- Department of Anesthesiology, University Hospitals Leuven, Leuven, Belgium
| | - Roselien Meeusen
- Department of Anesthesiology, University Hospitals Leuven, Leuven, Belgium
| | - Marc Gewillig
- Department of Pediatric and Congenital Cardiology, University Hospitals Leuven, Leuven, Belgium.,Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Bjorn Cools
- Department of Pediatric and Congenital Cardiology, University Hospitals Leuven, Leuven, Belgium.,Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Koen Poesen
- Department of Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium.,Department of Neurosciences, KU Leuven, Leuven, Belgium
| | - Robert Sanders
- Department of Anesthesiology, University of Wisconsin, Madison, WI, USA
| | - Steffen Rex
- Department of Anesthesiology, University Hospitals Leuven, Leuven, Belgium.,Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
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Wu MF, Huang WC, Juang CF, Chang KM, Wen CY, Chen YH, Lin CY, Chen YC, Lin CC. A New Method for Self-Estimation of the Severity of Obstructive Sleep Apnea Using Easily Available Measurements and Neural Fuzzy Evaluation System. IEEE J Biomed Health Inform 2017; 21:1524-1532. [DOI: 10.1109/jbhi.2016.2633986] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Age modifies the relation between intraindividual measurement-to-measurement variation in blood pressure and cognitive function: the Maine-Syracuse Study. J Hypertens 2017; 36:268-276. [PMID: 28787305 DOI: 10.1097/hjh.0000000000001510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND There is evidence to suggest that intraindividual variability in blood pressure (BP IIV) may be superior to mean BP for predicting cognitive function, taken from both within a single visit and between-visits. BP IIV increases with age in studies of persons middle-aged and older. The aim was therefore to investigate age by BP IIV (SBP and DBP) interactions with regard to cognitive functioning while considering medication class and polypharmacy, which may also affect BP IIV with advancing age. METHOD AND RESULTS Cross-sectional analyses were performed on 980 community-dwelling individuals from the Maine-Syracuse Longitudinal Study. Automated BP measures were taken 15 times (five times each in sitting, reclining, and standing positions). Cognitive function was assessed using a thorough neuropsychological test battery following the BP assessment. A significant age by BP IIV interaction was observed. For individuals aged over age 60 years, IIV in SBP and DBP was inversely associated with Global Composite, Scanning and Tracking, and the Similarities test. IIV in SBP was additionally associated with Verbal Memory and the Mini-Mental State Examination. DBP IIV was additionally related to the Visual-Spatial Memory and Organization composite. There were no significant associations between BP IIV and cognitive function in those aged less than 60 years. CONCLUSION BP IIV is an important predictor of cognition with advancing age.
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Johnson KM, FitzGerald JM, Tavakoli H, Chen W, Sadatsafavi M. Stability of Asthma Symptom Control in a Longitudinal Study of Mild-Moderate Asthmatics. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY-IN PRACTICE 2017; 5:1663-1670.e5. [PMID: 28499773 DOI: 10.1016/j.jaip.2017.04.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/17/2016] [Revised: 03/29/2017] [Accepted: 04/04/2017] [Indexed: 01/11/2023]
Abstract
BACKGROUND Achieving and maintaining symptom control is a primary goal of asthma management. Although factors associated with the likelihood of achieving symptom control have been studied, there are unanswered questions on the stability of symptom control, that is, the tendency of individuals to remain at a given symptom control level over time. OBJECTIVE The objective of this study was to evaluate the stability of symptom control using a longitudinal cohort of mild-moderate asthmatics. METHODS Participants reported symptom control using the Global Initiative for Asthma criteria at 5 assessments during the 1-year follow-up period. We described variability in the stability of symptom control between individuals, and used a random-effects logistic regression model to evaluate the impact of a suite of factors on the stability of symptom control. RESULTS A total of 429 individuals (67% female, mean age 51.6) contributed 2141 study visits. Individuals varied from completely stable in symptom control (18% remained at the same control level in all 5 visits) to completely unstable (12% changed the control level between all subsequent visits). Only 4% of between-individual variation in the stability of symptom control was explained by the included exposures, and a secondary analysis indicated that the history of symptom control stability was the best predictor of current stability. CONCLUSIONS The tendency to remain at a given control level varies significantly among patients with asthma. Only a small fraction of this variability is explained by observable characteristics. In the absence of predictors, a previous history of symptom control stability is the best indicator of future stability and should be considered when monitoring symptom control.
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Affiliation(s)
- Kate M Johnson
- Collaboration for Outcomes Research and Evaluation, Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada
| | - J Mark FitzGerald
- Institute for Heart and Lung Health, Department of Medicine, the University of British Columbia, Vancouver, Canada; Centre for Clinical Epidemiology and Evaluation, the University of British Columbia, Vancouver, Canada
| | - Hamid Tavakoli
- Collaboration for Outcomes Research and Evaluation, Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada; Institute for Heart and Lung Health, Department of Medicine, the University of British Columbia, Vancouver, Canada
| | - Wenjia Chen
- Collaboration for Outcomes Research and Evaluation, Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada
| | - Mohsen Sadatsafavi
- Collaboration for Outcomes Research and Evaluation, Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada; Institute for Heart and Lung Health, Department of Medicine, the University of British Columbia, Vancouver, Canada; Centre for Clinical Epidemiology and Evaluation, the University of British Columbia, Vancouver, Canada.
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Visit-to-visit SBP variability and cardiovascular disease in a multiethnic primary care setting. J Hypertens 2017; 35 Suppl 1:S50-S56. [DOI: 10.1097/hjh.0000000000001333] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Lundholm MD, Rooney M, Maas MB, Attarian H, Prabhakaran S. Wake-Up Stroke Is Associated With Greater Nocturnal Mean Arterial Pressure Variability. Stroke 2017; 48:1668-1670. [PMID: 28455315 DOI: 10.1161/strokeaha.116.016202] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 03/01/2017] [Accepted: 03/16/2017] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE Wake-up strokes (WUS) account for ≈20% to 30% of ischemic strokes. Studies have shown that increased autonomic instability as measured by blood pressure variability (BPV) is greater in stroke patients than nonstroke patients, but no studies have compared BPV in WUS versus non-WUS patients. METHODS From a single-center prospective registry, we identified consecutive ischemic stroke patients. BPV was calculated as the coefficient of variation of the mean arterial pressure during the first 24 hours after hospitalization. We assessed 24-hour BPV as a continuous measure and in quartiles in WUS versus non-WUS patients using univariable and multivariable statistics. RESULTS Among 369 patients (64.9±16.5 years; 50.1% male; 64.7% white), 78 were WUS (21.1%). Clinical characteristics and medical history were not different between WUS and non-WUS patients except WUS patients were older (69.0 versus 63.8 years; P=0.015) and more frequently had previous ischemic stroke (29.5% versus 17.2%; P=0.012). Initial 24-hour BPV (11.77 versus 10.76; P=0.098) was similar between groups. However, WUS patients had greater nocturnal BPV (10.50 versus 8.95; P=0.030), whereas daytime BPV was similar between groups (10.96 versus 10.47, P=0.459). In multivariate analysis, the highest quartile (≥11.48 mm Hg) of nocturnal BPV was independently associated with WUS (adjusted odds ratio, 1.95; confidence interval, 1.13-3.39; P=0.017). CONCLUSIONS In this single-center study, we observed that greater nocturnal BPV during the first 24 hours after hospitalization occurred in WUS than non-WUS patients. Nocturnal autonomic instability warrants further study as a potential mechanism of WUS.
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Affiliation(s)
- Michelle D Lundholm
- From the Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL
| | - Melissa Rooney
- From the Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL
| | - Matthew B Maas
- From the Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL
| | - Hrayr Attarian
- From the Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL
| | - Shyam Prabhakaran
- From the Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL.
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Saito Y, Takahashi O, Arioka H, Kobayashi D. Associations between body fat variability and later onset of cardiovascular disease risk factors. PLoS One 2017; 12:e0175057. [PMID: 28369119 PMCID: PMC5378370 DOI: 10.1371/journal.pone.0175057] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Accepted: 03/20/2017] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVE There is current debate regarding whether body weight variability is associated with cardiovascular events. Recently, high body fat percentage (BF%) has been shown to be a cardiovascular risk factor. We therefore hypothesized that BF% variability would present a stronger cardiovascular risk than body weight variability. METHODS A single-center retrospective cohort study of medical check-up examinees aged 20 years or older at baseline (2005) was performed. Examinees were followed in 2007, 2009, and 2013-2014. BF% variability in 2005, 2007 and 2009 was calculated as the root-mean square error (RMSE) using a simple linear regression model. Multiple logistic regression models estimated the association between BF%-RMSE and new diagnoses of cardiovascular risk factors occurring between the 2009 and 2013-2014 visits. RESULTS In total, 11,281 participants (mean age: 51.3 years old, 48.8% were male) were included in this study. The average BF%-RMSE of our subjects was 0.63, and the average BMI-RMSE was 0.24. The high BF%-RMSE group (76-100th percentile) had a higher incidence of hypertension and a lower incidence of diabetes mellitus than the low BF%-RMSE group (1-25th percentile). This tendency was particularly evident in male participants. BMI-RMSE was not associated with any cardiovascular risks in our study. CONCLUSIONS This study indicates that body fat variability has contrasting effects on cardiovascular risk factors, while body weight variability has no significant effects.
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Affiliation(s)
- Yuki Saito
- Division of General Internal Medicine, Department of Medicine, St. Luke’s International Hospital, Tokyo, Japan
- * E-mail:
| | - Osamu Takahashi
- Division of General Internal Medicine, Department of Medicine, St. Luke’s International Hospital, Tokyo, Japan
- Center for Clinical Epidemiology, St. Luke's Life Science Institute, Tokyo, Japan
| | - Hiroko Arioka
- Division of General Internal Medicine, Department of Medicine, St. Luke’s International Hospital, Tokyo, Japan
| | - Daiki Kobayashi
- Division of General Internal Medicine, Department of Medicine, St. Luke’s International Hospital, Tokyo, Japan
- Center for Clinical Epidemiology, St. Luke's Life Science Institute, Tokyo, Japan
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Jain KK. Personalized Management of Cardiovascular Disorders. Med Princ Pract 2017; 26:399-414. [PMID: 28898880 PMCID: PMC5757599 DOI: 10.1159/000481403] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 09/11/2017] [Indexed: 12/28/2022] Open
Abstract
Personalized management of cardiovascular disorders (CVD), also referred to as personalized or precision cardiology in accordance with general principles of personalized medicine, is selection of the best treatment for an individual patient. It involves the integration of various "omics" technologies such as genomics and proteomics as well as other new technologies such as nanobiotechnology. Molecular diagnostics and biomarkers are important for linking diagnosis with therapy and monitoring therapy. Because CVD involve perturbations of large complex biological networks, a systems biology approach to CVD risk stratification may be used for improving risk-estimating algorithms, and modeling of personalized benefit of treatment may be helpful for guiding the choice of intervention. Bioinformatics tools are helpful in analyzing and integrating large amounts of data from various sources. Personalized therapy is considered during drug development, including methods of targeted drug delivery and clinical trials. Individualized recommendations consider multiple factors - genetic as well as epigenetic - for patients' risk of heart disease. Examples of personalized treatment are those of chronic myocardial ischemia, heart failure, and hypertension. Similar approaches can be used for the management of atrial fibrillation and hypercholesterolemia, as well as the use of anticoagulants. Personalized management includes pharmacotherapy, surgery, lifestyle modifications, and combinations thereof. Further progress in understanding the pathomechanism of complex cardiovascular diseases and identification of causative factors at the individual patient level will provide opportunities for the development of personalized cardiology. Application of principles of personalized medicine will improve the care of the patients with CVD.
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Affiliation(s)
- Kewal K. Jain
- *Prof. K.K. Jain, MD, FRACS, FFPM, CEO, Jain PharmaBiotech, Bläsiring 7, CH-4057 Basel (Switzerland), E-Mail
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The relationship between dietary salt intake and ambulatory blood pressure variability in non-diabetic hypertensive patients. Nefrologia 2016; 36:694-700. [DOI: 10.1016/j.nefro.2015.12.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 12/14/2015] [Indexed: 01/06/2023] Open
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Xu M, Wu Y, Wang H, Xu X, Zhao S, Zhang M, Jin H, Yan J, Wang B, Gong J, Lu X, Peng J, Dai Q. Effects of lercanidipine hydrochloride versus felodipine sustained-release on day-to-day home blood pressure variability. Curr Med Res Opin 2016; 32:43-52. [PMID: 27779454 DOI: 10.1080/03007995.2016.1220932] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVE The objective of this study was to compare the effectiveness of lercanidipine with felodipine in patients with mild-to-moderate hypertension on day-to-day home blood pressure variability. METHODS This is a sub-study of a multicenter, randomized, open-label, parallel group and active controlled clinical trial. Hypertensive patients aged 18-75 (i.e. diastolic blood pressure ≥90 mmHg and <110 mmHg; systolic blood pressure ≥140 mmHg and <180 mmHg) and 24 h mean BP >130/80 mmHg) were eligible for this study. During the study, blood pressure (BP) and heart rate (HR) were recorded. The day-to-day BP variability (BPV) and HR variability (HRV) were obtained by the standard deviation (SD) of daily BP/HR average (of six readings) in 7 days. RESULTS There were 186 patients (89 and 97 patients in the lercanidipine and felodipine groups, respectively) included in this study. Lercanidipine hydrochloride 10 mg/d and felodipine sustained-release tablets 5 mg/d were given to their respective groups. After 6 weeks of treatment, SD of home BP significantly reduced compared with baseline in both groups (P < .05) while SD of home HR also changed significantly after treatment (P < .05). There was no significant difference in SD of home BPV between the lercanidipine and felodipine groups after treatment. CONCLUSION Treatment with lercanidipine and felodipine both resulted in reduction of BPV and HRV. There was no significant inter-group difference in reduction of BPV between the groups. Lercanidipine is an effective antihypertensive drug in improving BPV. National clinical trial: NCT01520285.
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Affiliation(s)
- Mengdan Xu
- a Shanghai General Hospital of Nanjing Medical University, Shanghai Jiaotong University , Shanghai , China
| | - Ying Wu
- a Shanghai General Hospital of Nanjing Medical University, Shanghai Jiaotong University , Shanghai , China
| | - Hao Wang
- b Henan Provincial People's Hospital , Zhengzhou , China
| | - Xin Xu
- c Wuxi No.2 People's Hospital , Wuxi , Jiangsu , China
| | - Shuiping Zhao
- d The Second Xiangya Hospital of Central South University , Changsha , Hunan , China
| | - Mei Zhang
- e Qilu Hospital of Shandong University , Jinan , Shandong , China
| | - Huigen- Jin
- f Putuo District Center Hospital , Shanghai , China
| | - Jinchuan Yan
- g Affiliated Hospital of Jiangsu University , Zhenjiang , Jiangsu , China
| | - Bangning Wang
- h The First Affiliated Hospital of Anhui Medical University , Nanjing , Jiangsu , China
| | - Jianbin Gong
- i Nanjing General Hospital of Nanjing Medical University , Nanjing , Jiangsu , China
| | - Xiang Lu
- j The Second Affiliated Hospital of Nanjing Medical University
| | - Jianqiang Peng
- k Hunan Provincial People's Hospital , Changsha , Hunan , China
| | - Qiuyan Dai
- a Shanghai General Hospital of Nanjing Medical University, Shanghai Jiaotong University , Shanghai , China
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Wang B, Katsube T, Begum N, Nenoi M. Revisiting the health effects of psychological stress-its influence on susceptibility to ionizing radiation: a mini-review. JOURNAL OF RADIATION RESEARCH 2016; 57:325-35. [PMID: 27242342 PMCID: PMC4973650 DOI: 10.1093/jrr/rrw035] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Revised: 02/02/2016] [Accepted: 02/25/2016] [Indexed: 05/03/2023]
Abstract
Both psychological stress (PS) and ionizing radiation (IR) cause varied detrimental effects on humans. There has been no direct evidence so far showing PS alone could cause cancer; however, long-lasting PS may affect our overall health and ability to cope with cancer. Due to their living conditions and occupations, some people may encounter concurrent exposure to both PS and IR to a high extent. In addition to possible health effects resulting directly from exposure to IR on these people, fear of IR exposure is also a cause of PS. The question of whether PS would influence susceptibility to IR, radiocarcinogenesis in particular, is of great concern by both the academic world and the public. Recently, investigations using animal PS models demonstrated that PS could modulate susceptibility to IR, causing increased susceptibility to radiocarcinogenesis in Trp53-heterozygous mice, hematological toxicity in peripheral blood and elevated chromosome aberration (dicentrics) frequency in splenocytes of Trp53-wild-type mice. To actively reduce health risk from exposure to IR, further studies are needed to cumulate more evidence and provide insights into the mechanisms underlying the alterations in susceptibility due to PS modulation. This mini-review gives a general overview of the significance of PS effects on humans and experimental animals, with a special focus on summarizing the latest weight-of-evidence approaches to radiobiological studies on PS-induced alterations in susceptibility in experimental animal models. The susceptibility being investigated is mainly in the context of the impact of the modulatory effect of PS on radiocarcinogenesis; we seek to improve understanding of the combined effects of exposure to both PS and IR in order to facilitate, via active intervention, strategies for radiation risk reduction.
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Affiliation(s)
- Bing Wang
- Radiation Risk Reduction Research Program, Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Takanori Katsube
- Radiation Risk Reduction Research Program, Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Nasrin Begum
- Center for Nuclear Medicine and Ultrasound, Rajshahi Medical College Hospital Campus, G.P.O. Box No. 35, Rajshahi, Bangladesh
| | - Mitsuru Nenoi
- Radiation Risk Reduction Research Program, Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
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James GD, Bovbjerg DH, Hill LA. Ethnic differences in inter- and intra-situational blood pressure variation: Comparisons among African-American, Hispanic-American, Asian-American, and European-American women. Am J Hum Biol 2016; 28:932-935. [PMID: 27224455 DOI: 10.1002/ajhb.22872] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 04/03/2016] [Accepted: 04/30/2016] [Indexed: 11/09/2022] Open
Abstract
OBJECTIVES The purpose of this study was to compare the daily inter- and intra-situational ambulatory blood pressure (BP) variation by ethnicity in women. METHODS The African-American (N = 82; Age = 39.7 + 8.9), Hispanic-American (N = 25; age = 37.5 + 9.4), Asian-American (N = 22; Age = 35.2 + 8.6), and European-American (N = 122; Age = 37.2+ 9.4) women in this study all worked in similar positions at two major medical centers in NYC. Each wore an ambulatory monitor during the course of one mid-week workday. Proportional BP changes from work or home to sleep, intra-situational BP variation (standard deviation [SD]) and mean situational BP levels were compared among the groups using ANOVA models. RESULTS African-American and Asian-American women had significantly smaller proportional work-sleep systolic changes than either European- (P < 0.05) or Hispanic-American (P < 0.05) women, but the Asian-American women's changes tended to be smallest. The variability (SD) of diastolic BP at work was significantly greater among African- and Hispanic-American women compared to Asian- and European-American women (all P < 0.05). African-American women had greater sleep variability than European-American women (P < 0.05). Asian-American women had the highest level of sleep diastolic pressure (all comparisons P < 0.05). CONCLUSIONS African-American and Asian-American women have an attenuated proportional BP decline from waking environments to sleep compared to European-American and Hispanic-American women. Asian-American nocturnal BP may be elevated relative to all other groups. Am. J. Hum. Biol. 28:932-935, 2016. © 2016Wiley Periodicals, Inc.
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Affiliation(s)
- Gary D James
- Department of Anthropology, Binghamton University, Binghamton, New York, 13902.,Decker School of Nursing, Binghamton University, Binghamton, New York, 13902.,Department of Biomedical Engineering, Binghamton University, Binghamton, New York, 13902
| | - Dana H Bovbjerg
- Departments of Psychiatry, Psychology, Behavioral & Community Health Sciences, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, 15232.,Biobehavioral Oncology Program, University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, 15232
| | - Leah A Hill
- Department of Anthropology, Binghamton University, Binghamton, New York, 13902
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Impact of awake blood pressure variability on cerebrovascular atherosclerosis in Chinese patients with acute ischemic stroke. Blood Press Monit 2016; 21:271-6. [PMID: 27214144 DOI: 10.1097/mbp.0000000000000198] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Blood pressure (BP) variability has been shown to be an independent risk factor of stroke and target organ damage because of hypertension, but so far, there have been very few studies investigating the impact of BP variability on cerebrovascular atherosclerosis. METHODS A total of 409 participants were enrolled and classified according to patterns of cerebrovascular atherosclerosis (i.e. large or small artery atherosclerosis; extracranial; or intracranial artery atherosclerosis). Coefficient of variation (CV) was used as a marker of BP variability. Multivariate binary logistical regression was used to analyze the associations between BP variability and the risk of different patterns of cerebrovascular atherosclerosis. RESULTS The risk of large artery atherosclerosis and extracranial arterial stenosis, respectively, had a dose-responsive positive relationship with the tertiles of awake systolic blood pressure (SBP) CVs [large artery atherosclerosis, the second tertile, adjusted odds ratio (OR)=2.839, 95% confidence interval (CI) 1.593-5.059, P<0.001; the third tertile, adjusted OR=4.010, 95% CI 1.859-8.651, P<0.001; extracranial arterial stenosis, the second tertile, adjusted OR=2.274, 95% CI 1.189-4.348, P=0.013; the third tertile, adjusted OR=2.568, 95% CI 1.230-5.360, P=0.012, when referenced to the first tertile], but not with those of mean awake SBP. The third tertile of awake SBP CVs indicated a significantly higher risk of intracranial arterial stenosis (adjusted OR=2.253, 95% CI 1.118-4.538, P=0.023) and advanced intracranial arterial stenosis (adjusted OR=5.073, 95% CI 2.064-12.466, P<0.001) when referenced to the first tertile. CONCLUSION In Chinese patients with acute atherosclerotic stroke, higher awake BP variability (measured in the subacute stage) might be associated with a higher risk of large artery atherosclerosis.
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Ozturk C, Ozturk A, Demir M, Yildirim AO, Balta S, Aparci M, Unlu M, Demirkol S. Blood Pressure Variability Provides Useful and Prognostic Information on the White-Coat Effect Among Older Patients. J Clin Hypertens (Greenwich) 2016; 18:825. [DOI: 10.1111/jch.12796] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cengiz Ozturk
- Department of Cardiology; Gulhane Medical Faculty; Ankara Turkey
| | - Ahmet Ozturk
- Department of Geriatric Medicine; Gulhane Medical Faculty; Ankara Turkey
| | - Mustafa Demir
- Department of Cardiology; Gulhane Medical Faculty; Ankara Turkey
| | | | - Sevket Balta
- Department of Cardiology; Gulhane Medical Faculty; Ankara Turkey
| | - Mustafa Aparci
- Department of Cardiology; Kasimpasa Military Hospital; Istanbul Turkey
| | - Murat Unlu
- Department of Cardiology; Gulhane Medical Faculty; Ankara Turkey
| | - Sait Demirkol
- Department of Cardiology; Gulhane Medical Faculty; Ankara Turkey
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Heart Rate and Systolic Blood Pressure Variability in the Time Domain in Patients with Recent and Long-Standing Diabetes Mellitus. PLoS One 2016; 11:e0148378. [PMID: 26849653 PMCID: PMC4746070 DOI: 10.1371/journal.pone.0148378] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 01/18/2016] [Indexed: 11/19/2022] Open
Abstract
Diabetes Mellitus (DM) affects the cardiovascular response of patients. To study this effect, interbeat intervals (IBI) and beat-to-beat systolic blood pressure (SBP) variability of patients during supine, standing and controlled breathing tests were analyzed in the time domain. Simultaneous noninvasive measurements of IBI and SBP for 30 recently diagnosed and 15 long-standing DM patients were compared with the results for 30 rigorously screened healthy subjects (control). A statistically significant distinction between control and diabetic subjects was provided by the standard deviation and the higher moments of the distributions (skewness, and kurtosis) with respect to the median. To compare IBI and SBP for different populations, we define a parameter, α, that combines the variability of the heart rate and the blood pressure, as the ratio of the radius of the moments for IBI and the same radius for SBP. As diabetes evolves, α decreases, standard deviation of the IBI detrended signal diminishes (heart rate signal becomes more "rigid"), skewness with respect to the median approaches zero (signal fluctuations gain symmetry), and kurtosis increases (fluctuations concentrate around the median). Diabetes produces not only a rigid heart rate, but also increases symmetry and has leptokurtic distributions. SBP time series exhibit the most variable behavior for recently diagnosed DM with platykurtic distributions. Under controlled breathing, SBP has symmetric distributions for DM patients, while control subjects have non-zero skewness. This may be due to a progressive decrease of parasympathetic and sympathetic activity to the heart and blood vessels as diabetes evolves.
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Jochum T, Hoyme J, Schulz S, Weißenfels M, Voss A, Bär KJ. Diverse autonomic regulation of pupillary function and the cardiovascular system during alcohol withdrawal. Drug Alcohol Depend 2016; 159:142-51. [PMID: 26790823 DOI: 10.1016/j.drugalcdep.2015.12.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 12/07/2015] [Accepted: 12/08/2015] [Indexed: 11/28/2022]
Abstract
BACKGROUND Previous research indicated the complexity of autonomic dysfunction during acute alcohol withdrawal. This study aimed to investigate the pupillary light reflex as an indicator of midbrain and brainstem regulatory systems in relation to cardiovascular autonomic function. METHODS Thirty male patients were included in the study. They were investigated during acute alcohol withdrawal syndrome and 24h later during clomethiazole treatment and compared to healthy controls. Parameters of pupillary light reflex of both eyes as well as heart rate variability, blood pressure variability and baroreflex sensitivity (BRS) were studied. RESULTS We observed significantly reduced sympathetic (small diameter, e.g., left eye: 5.00 in patients vs. 5.91 mm in controls) and vagal modulation (e.g., prolonged latencies, left eye: 0.28 vs. 0.26 ms) regarding both pupils during acute alcohol withdrawal syndrome. Cardiovascular parameters showed reduced vagal modulation (e.g., b-slope of BRS: 7. 57 vs. 13.59 ms/mm Hg) and mixed results for sympathetic influence. After 24h, autonomic dysfunction improved significantly, both for the pupils (e.g., left diameter: 5.38 mm) and the heart (e.g., b-slope of BRS: 9.34 ms/mm Hg). While parameters obtained from the pupil correlated with cardiac autonomic function (e.g, BRS and left diameter: r=0.564) in healthy controls, no such pattern was observed in patients. CONCLUSION Results obtained from the pupil during acute alcohol withdrawal do not simply mirror autonomic dysfunction regarding the heart. Pupillary and cardiovascular changes after 24h indicate state dependencies of the results. The findings are discussed with respect to autonomic mechanisms and potentially involved brain regions.
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Affiliation(s)
- Thomas Jochum
- Psychiatric Brain & Body Research Group Jena, Department of Psychiatry and Psychotherapy, Jena University Hospital, Jena, Germany
| | - Johannes Hoyme
- Psychiatric Brain & Body Research Group Jena, Department of Psychiatry and Psychotherapy, Jena University Hospital, Jena, Germany
| | - Steffen Schulz
- Department of Medical Engineering and Biotechnology, Ernst-Abbe-Hochschule Jena, University of Applied Sciences, Jena, Germany
| | - Markus Weißenfels
- Psychiatric Brain & Body Research Group Jena, Department of Psychiatry and Psychotherapy, Jena University Hospital, Jena, Germany
| | - Andreas Voss
- Department of Medical Engineering and Biotechnology, Ernst-Abbe-Hochschule Jena, University of Applied Sciences, Jena, Germany
| | - Karl-Jürgen Bär
- Psychiatric Brain & Body Research Group Jena, Department of Psychiatry and Psychotherapy, Jena University Hospital, Jena, Germany.
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Lewis R, Curtis JT. Male prairie voles display cardiovascular dipping associated with an ultradian activity cycle. Physiol Behav 2016; 156:106-16. [PMID: 26780151 DOI: 10.1016/j.physbeh.2016.01.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 12/22/2015] [Accepted: 01/12/2016] [Indexed: 11/16/2022]
Abstract
Mammals typically display alternating active and resting phases and, in most species, these rhythms follow a circadian pattern. The active and resting phases often are accompanied by corresponding physiological changes. In humans, blood pressure decreases during the resting phase of the activity cycle, and the magnitude of that "nocturnal dipping" has been used to stratify patients according to the risk for cardiovascular disease. However, in contrast to most mammals, prairie voles (Microtus ochrogaster) have periods of activity and rest that follow an ultradian rhythm with period lengths significantly <24h. While rhythmic changes in blood pressure across a circadian activity cycle have been well-documented, blood pressure patterns in species that display ultradian rhythms in activity are less well-studied. In the current study, we implanted pressure-sensitive radiotelemetry devices in male prairie voles and recorded activity, mean arterial pressure (MAP), and heart rate (HR) continuously for 3days. Visualization of the ultradian rhythms was enhanced using a 1h running average to filter the dataset. Positive correlations were found between activity and MAP and between activity and HR. During the inactive period of the ultradian cycle, blood pressure decreased by about 15%, which parallels the nocturnal dipping pattern seen in healthy humans. Further, the duration of inactivity did not affect any of the cardiovascular measures, so the differences in blood pressure values between the active and inactive periods are likely driven by ultradian oscillations in hormones and autonomic function. Finally, specific behavioral patterns also were examined. Both the instrumented animal and his non-instrumented cagemate appeared to show synchronized activity patterns, with both animals displaying sleep-like behavior for more than 90% of the inactive period. We propose that the prairie vole ultradian rhythm in blood pressure is an analogue for circadian blood pressure variability and can be used to study the long-term effects of commonly prescribed drugs on blood pressure dipping.
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Affiliation(s)
- Robert Lewis
- Department of Pharmacology and Physiology, Oklahoma State University Center for Health Sciences, 1111 W. 17th St., Tulsa, OK 74107, United States.
| | - J Thomas Curtis
- Department of Pharmacology and Physiology, Oklahoma State University Center for Health Sciences, 1111 W. 17th St., Tulsa, OK 74107, United States.
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Understanding Blood Pressure Variation and Variability: Biological Importance and Clinical Significance. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2016; 956:3-19. [DOI: 10.1007/5584_2016_83] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
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Wang B, Tanaka K, Katsube T, Ninomiya Y, Vares G, Liu Q, Morita A, Nakajima T, Nenoi M. Chronic restraint-induced stress has little modifying effect on radiation hematopoietic toxicity in mice. JOURNAL OF RADIATION RESEARCH 2015; 56:760-7. [PMID: 26045492 PMCID: PMC4576999 DOI: 10.1093/jrr/rrv030] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 05/01/2015] [Indexed: 05/16/2023]
Abstract
Both radiation and stresses cause detrimental effects on humans. Besides possible health effects resulting directly from radiation exposure, the nuclear plant accident is a cause of social psychological stresses. A recent study showed that chronic restraint-induced stresses (CRIS) attenuated Trp53 functions and increased carcinogenesis susceptibility of Trp53-heterozygous mice to total-body X-irradiation (TBXI), having a big impact on the academic world and a sensational effect on the public, especially the residents living in radioactively contaminated areas. It is important to investigate the possible modification effects from CRIS on radiation-induced health consequences in Trp53 wild-type (Trp53wt) animals. Prior to a carcinogenesis study, effects of TBXI on the hematopoietic system under CRIS were investigated in terms of hematological abnormality in the peripheral blood and residual damage in the bone marrow erythrocytes using a mouse restraint model. Five-week-old male Trp53wt C57BL/6J mice were restrained 6 h per day for 28 consecutive days, and TBXI (4 Gy) was given on the 8th day. Results showed that CRIS alone induced a marked decrease in the red blood cell (RBC) and the white blood cell (WBC) count, while TBXI caused significantly lower counts of RBCs, WBCs and blood platelets, and a lower concentration of hemoglobin regardless of CRIS. CRIS alone did not show any significant effect on erythrocyte proliferation and on induction of micronucleated erythrocytes, whereas TBXI markedly inhibited erythrocyte proliferation and induced a significant increase in the incidences of micronucleated erythrocytes, regardless of CRIS. These findings suggest that CRIS does not have a significant impact on radiation-induced detrimental effects on the hematopoietic system in Trp53wt mice.
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Affiliation(s)
- Bing Wang
- Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Kaoru Tanaka
- Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Takanori Katsube
- Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Yasuharu Ninomiya
- Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Guillaume Vares
- Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Qiang Liu
- Institute of Radiation Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, PR China
| | - Akinori Morita
- Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima 770-8509, Japan
| | - Tetsuo Nakajima
- Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Mitsuru Nenoi
- Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
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Çağlı K, Turak O, Canpolat U, Özcan F, Tok D, Mendi MA, Öksüz F, Siriopol D, Veisa G, Covic A, Kanbay M. Association of Serum Uric Acid Level With Blood Pressure Variability in Newly Diagnosed Essential Hypertension. J Clin Hypertens (Greenwich) 2015; 17:929-35. [PMID: 26252718 DOI: 10.1111/jch.12641] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2015] [Revised: 05/22/2015] [Accepted: 05/29/2015] [Indexed: 11/30/2022]
Affiliation(s)
- Kumral Çağlı
- Cardiology Clinic; Türkiye Yuksek Ihtisas Training and Research Hospital; Ankara Turkey
| | - Osman Turak
- Cardiology Clinic; Türkiye Yuksek Ihtisas Training and Research Hospital; Ankara Turkey
| | - Uğur Canpolat
- Cardiology Clinic; Türkiye Yuksek Ihtisas Training and Research Hospital; Ankara Turkey
| | - Fırat Özcan
- Cardiology Clinic; Türkiye Yuksek Ihtisas Training and Research Hospital; Ankara Turkey
| | - Derya Tok
- Cardiology Clinic; Türkiye Yuksek Ihtisas Training and Research Hospital; Ankara Turkey
| | - Mehmet Ali Mendi
- Cardiology Clinic; Türkiye Yuksek Ihtisas Training and Research Hospital; Ankara Turkey
| | - Fatih Öksüz
- Cardiology Clinic; Türkiye Yuksek Ihtisas Training and Research Hospital; Ankara Turkey
| | - Dimitrie Siriopol
- Nephrology Clinic, Dialysis and Renal Transplant Center; ‘C.I. PARHON’ University Hospital, and ‘Grigore T. Popa’ University of Medicine; Iasi Romania
| | - Gabriel Veisa
- Nephrology Clinic, Dialysis and Renal Transplant Center; ‘C.I. PARHON’ University Hospital, and ‘Grigore T. Popa’ University of Medicine; Iasi Romania
| | - Adrian Covic
- Nephrology Clinic, Dialysis and Renal Transplant Center; ‘C.I. PARHON’ University Hospital, and ‘Grigore T. Popa’ University of Medicine; Iasi Romania
| | - Mehmet Kanbay
- Division of Nephrology; Department of Medicine; Koc University School of Medicine; Istanbul Turkey
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