1
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Norouzi M, Mahboobi S, Eftekhari MH, Salehipour M, Ghaem H, Mirzakhanlouei A, Mohsenpour MA. Effects of L-Carnitine and Coenzyme Q10 Supplementation on Lower Urinary Tract Symptoms in Men with Benign Prostatic Hyperplasia: A Randomized, Controlled, Clinical Trial. Nutr Cancer 2024; 76:207-214. [PMID: 38105612 DOI: 10.1080/01635581.2023.2295578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 12/11/2023] [Indexed: 12/19/2023]
Abstract
The prevalence of benign prostatic hyperplasia (BPH) and its associated lower urinary tract symptoms (LUTS) increases with age. Considering that BPH drug treatment is associated with complications, this study aimed to investigate the effects of L-carnitine (LC) and Coenzyme Q10 (CoQ10) supplementation as an adjunct therapy to finasteride in the management of LUTS in older men affected with BPH. Fifty eligible volunteers (25 per group) were randomly assigned to either intervention (finasteride + LC and CoQ10 supplements) or control (finasteride + placebo) groups. International prostate symptom score (IPSS), international index of erectile function (IIEF), quality of life index (QoL), as well as serum levels of Prostate-specific antigen (PSA), were assessed. Prostate ultrasound evaluation was also performed, before and after 8 wk of intervention. Supplementation with LC and CoQ10 led to a significant decrease in prostate volume (p < 0.001) as well as a significant increase in IIEF (p < 0.001), compared to the control group. However, there were no significant between-group differences in IPSS (p = 0.503), QoL scores (p = 0.339), and PSA levels (p = 0.482). CoQ10 and LC supplements might be beneficial in combination with standard therapies in the management of BPH and its related complications.
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Affiliation(s)
- Mahsa Norouzi
- Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Sepideh Mahboobi
- Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mohammad Hassan Eftekhari
- Department of Clinical Nutrition, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
- Research Center for Health Sciences, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mehdi Salehipour
- Department of Urology, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Haleh Ghaem
- Department of Epidemiology, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Ali Mirzakhanlouei
- Department of Urology, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mohammad Ali Mohsenpour
- Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
- Department of Clinical Nutrition, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
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2
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Rezaie MR, Norouzi M, Kayhani MH, Taghavi SM, Kim M, Kim KC. On viscoelastic drop impact onto thin films: axisymmetric simulations and experimental analysis. Sci Rep 2023; 13:11041. [PMID: 37419954 DOI: 10.1038/s41598-023-38235-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Accepted: 07/05/2023] [Indexed: 07/09/2023] Open
Abstract
This study investigates the effect of fluid elasticity on axisymmetric droplets colliding with pre-existing liquid films, using both numerical and experimental approaches. The numerical simulations involve solving the incompressible flow momentum equations with viscoelastic constitutive laws using the finite volume method and the volume of fluid (VOF) technique to track the liquid's free surface. Here, the Oldroyd-B model is used as the constitutive equation for the viscoelastic phase. Experiments are also performed for dilute viscoelastic solutions with 0.005% and 0.01% (w/w) polyacrylamide in 80:20 glycerin/water solutions, in order to ensure the validity of the numerical solution and to investigate the elasticity effect. The formation and temporal evolution of the crown parameters are quantified by considering the flow parameters, including the fluid's elasticity. The results indicate that the axisymmetric numerical solutions reasonably agree with the experimental observations. Generally, the fluid's elasticity can enlarge the crown dimension at different thicknesses of the fluid film. Moreover, at intermediate values of the Weissenberg number, the extensional force in the crown wall can control the crown propagation. Furthermore, the results reveal that the effects of the Weber number and the viscosity ratio on this problem are more significant at higher values of the Weissenberg number.
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Affiliation(s)
- M R Rezaie
- Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
| | - M Norouzi
- Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
| | - M H Kayhani
- Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
| | - S M Taghavi
- Chemical Engineering Department, Laval University, Quebec, G1V 0A6, Canada
| | - Mirae Kim
- Rolls-Royce and Pusan National University Technology Center, Pusan National University, Busan, Republic of Korea.
| | - Kyung Chun Kim
- School of Mechanical Engineering, Eco-friendly Smart Ship Parts Technology Innovation Center, Pusan National University, Busan, 46241, Republic of Korea.
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3
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Montazerlotfelahi H, Norouzi M, Askarimoghaddam F, Hashemnejad MA, Bastan Sarabi N, Qorbani M, Dehghani M, Ashrafi M, Mostafavi K, Ketabforoush AHME, Nikkhah A. Neurological Involvements in COVID-19: A hospital-based study. Iran J Child Neurol 2023; 17:69-80. [PMID: 37637789 PMCID: PMC10448850 DOI: 10.22037/ijcn.v17i2.36829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Accepted: 06/27/2022] [Indexed: 08/29/2023]
Abstract
Objectives The SARS-CoV-2 pandemic is the most challenging crisis in the contemporary world. Besides severe pulmonary involvement, the disease also has several extrapulmonary manifestations, and new signs and symptoms are associated with it every dayThe present study aimed to inquire about the frequency of neurological manifestations and risk factors of COVID-19. Materials & Methods This retrospective, descriptive study included patients with neurological involvement admitted to the Alborz University of Medical Sciences academic hospitals from March 2020 to July 2020 with confirmed COVID-19 infection. The data included in the analysis were the patient's demographic information, underlying diseases, neurological manifestations, and laboratory findings. Results The study included ninety-five patients with a mean age of fifty-nine. Neurological symptoms and signs were observed in 91.6% and 10.5% of the patients, respectively. The most frequently associated neurological symptoms of COVID-19 were fatigue (49.5%), headache (47.4%), and dizziness (45.3%). Furthermore, the most common neurological involvements included gait disorders (6.3%), cerebellar dysfunction (4.2%), and cerebrovascular accidents (3.15%). Positive troponin was shown to be the strongest predictor of neurological signs (OR=21, P=0.017), followed by WBC≥15,000 (OR = 20.75, P=0.018) and a history of respiratory disease (OR=7.42, P=0.007). Conclusion Neurological symptoms were observed in more than 91% of the patients, while neurological signs were present in 10.5% of the COVID-19 patients. Additionally, positive troponin, WBC≥15,000, and a history of respiratory disease were the strongest predictors of neurological signs.
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Affiliation(s)
- Hadi Montazerlotfelahi
- Department of Pediatric Neurology, Imam Ali Hospital, Faculty of Medicine, Alborz University of medical sciences, Karaj, Iran
| | - Mahsa Norouzi
- Department of the Pediatrics, Imam Ali Hospital, Faculty of Medicine, Alborz University of Medical Sciences, Karaj, Iran
| | - Forough Askarimoghaddam
- Department of the Pediatrics, Imam Ali Hospital, Faculty of Medicine, Alborz University of Medical Sciences, Karaj, Iran
| | | | - Niusha Bastan Sarabi
- Cellular and Molecular Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Mostafa Qorbani
- Non-communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran
| | - Mahdieh Dehghani
- Department of Oral and Maxillofacial, Faculty of Dentistry, Tehran Medical Sciences of Islamic Azad, University, Tehran, Iran
| | - Mahmoudreza Ashrafi
- Department of Pediatric Neurology, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Keihan Mostafavi
- Student Research Committee, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | | | - Ali Nikkhah
- Pediatric Neurology Department, Mofid Children's Hospital, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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4
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Hashem Boroojerdi M, Rahimi A, Roostayi MM, Talebian Moghaddam S, Yousefi M, Norouzi M, Akbarzadeh Baghban A. The occurrence of flexion-relaxation phenomenon in elite cyclists during trunk forward bending. Sports Biomech 2022:1-13. [PMID: 36239128 DOI: 10.1080/14763141.2022.2126326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Accepted: 09/14/2022] [Indexed: 10/17/2022]
Abstract
Flexion-relaxation phenomenon (FRP) is a well-known phenomenon in spinal extensor muscles. According to the literature, prolonged flexed posture leads to creep phenomenon and affects the active and passive neuromuscular control of the spinal column. The purpose of this study was to investigate FRP occurrence in elite cyclists that prolonged flexion posture is an integral part of their professional life. Their muscles' contraction pattern during forward bending was also compared. Electromyography (EMG) was recorded during flexion and extension from standing position in thoracic erector spinae (TES), lumbar erector spinae (LES) and gluteus maximus (Gluteus max) in 15 healthy male elite cyclists. In addition, the kinematic data related to the trunk angles were simultaneously recorded by a motion analysis system. Two-way ANOVA was used to assess the effects of muscle group and direction of movement on maximum amplitude of EMG activity. Among 15 cyclists, FRP was detectable in 60%, 87% and 73% of the participants in TES, LES and Gluteus max, respectively, and happened between 74% and 82% of the trunk flexion. There was no statistically significant difference in onset and offset of muscles FRP. Despite prolong hyper kyphotic posture, FRP was identifiable in TES, LES and Gluteus max muscles of elite cyclists.
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Affiliation(s)
- M Hashem Boroojerdi
- Department of Physiotherapy, School of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - A Rahimi
- Department of Physiotherapy, School of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - M M Roostayi
- Department of Physiotherapy, School of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - S Talebian Moghaddam
- Department of Physiotherapy, Faculty of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran
| | - M Yousefi
- Department of Physiotherapy, School of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- School of Physical Education, University of Birjand, Birjand, Iran
| | - M Norouzi
- Department of Physiotherapy, School of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - A Akbarzadeh Baghban
- Department of Biostatistics, School of Paramedical Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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5
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Shapouri S, Matani R, Salahshoor A, Qorbani M, Hosseini A, Norouzi M, Khavandegar A. Rectal measurements and their correlation with bowel habits: Evaluation by trans-abdominal ultrasound in children with functional constipation. J Paediatr Child Health 2022; 58:1792-1796. [PMID: 35778914 DOI: 10.1111/jpc.16104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 06/16/2022] [Accepted: 06/19/2022] [Indexed: 11/29/2022]
Abstract
AIM Constipation is one of the most common complaints in childhood affecting the quality of life of both children and parents. This study intends to investigate rectal measurements on ultrasound and their relationship with bowel habits. METHODS In this cross-sectional study, 100 children with functional constipation (FC) referred to a single hospital between 2018 and 2019 were enrolled. After obtaining informed consent, a questionnaire including demographic and constipation characteristics was completed, and a physical examination including digital rectal examination (DRE) was performed. Complete abdominopelvic ultrasound was then performed. Target measurements included rectal transverse diameter (RTD), rectal anterior wall thickness (RAWT) and the presence of faecal impaction. RESULTS One hundred children with a mean age of 7.68 ± 3.30 years were present in the study. The mean duration of constipation was 15.86 ± 13.34 months. In 14% of children, painful defaecation was reported. 88% of children had some degree of faecal incontinence. According to the ultrasound findings, the mean RTD and RAWT were 3.39 ± 0.73 cm and 2.77 ± 0.68 mm, respectively, and faecal impaction was present in 70% of cases. There was a positive correlation between RTD and RAWT with age, duration of constipation and the presence of hard stools, and there was a negative correlation with frequency of defecation (P < 0.05). CONCLUSION RTD and RAWT increased with increasing constipation duration and the presence of hard stools and decreased with increasing frequency of defaecation. DRE could be omitted from the initial clinical assessment if you had access to reliable ultrasound data.
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Affiliation(s)
- Samaneh Shapouri
- Pediatrics Medicine Department, Imam Ali Hospital, Alborz University of Medical Sciences, Karaj, Iran
| | - Rahman Matani
- Pediatrics Medicine Department, Imam Ali Hospital, Alborz University of Medical Sciences, Karaj, Iran
| | - Ali Salahshoor
- Radiology Department, Alborz University of Medical Sciences, Karaj, Iran
| | - Mostafa Qorbani
- Non-Communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran
| | - Amirhossein Hosseini
- Pediatric Gastroentrology, Hepatology and Nutrition Research Center, Research Institute for Children's Health, Shahid Beheshti University of Medical sciences, Tehran, Iran
| | - Mahsa Norouzi
- Pediatrics Medicine Department, Imam Ali Hospital, Alborz University of Medical Sciences, Karaj, Iran
| | - Armin Khavandegar
- Student Research Committee, Alborz University of Medical Sciences, Karaj, Iran
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6
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As H, Cabuk R, Norouzi M, Balci G, Ozkaya O. Comparison of the critical power estimated by the best fit method and the maximal lactate steady state. Sci Sports 2022. [DOI: 10.1016/j.scispo.2021.12.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Vahabi S, Kharati-Koopaei E, Norouzi M, Maddox J, Humphreys A, Hancock H, Zaman A, Austin D. Anthracycline chemotherapy and its effects on left ventricular mechanics: insights into the PROACT PLUS study. Eur Heart J Cardiovasc Imaging 2022. [DOI: 10.1093/ehjci/jeab289.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: Public hospital(s). Main funding source(s): South Tees Research and Development Fund
Background
Anthracyclines continue to form the backbone of chemotherapy treatment for breast cancer and lymphoma. However, their use has been directly associated with dose-dependent cardiotoxicity. Most studies to date have focused on the effects of high dose anthracyclines on left ventricular (LV) systolic function with a particular interest in peak global longitudinal strain (GLS). Not much attention has been directed to the effects of lower dose anthracyclines and other strain parameters of LV systolic and diastolic function.
Purpose
In this prospective study, we performed a comprehensive 2-dimensional echocardiographic assessment on the effects of anthracyclines on both the LV systolic and diastolic strain measures. We focused on the changes in the LV end-systolic (ES) GLS, myocardial GLS (myoGLS), global radial strain (GRS), global circumferential strain (GCS), myocardial GCS (myoGCS), twist and torsion. Additionally, peak systolic (PS), ES, early-diastolic (ED), and late-diastolic (LD) strain-rates were measured.
Methods
Patients with a new diagnosis of breast cancer or lymphoma undergoing anthracycline chemotherapy (any dose) were recruited between October 2018 to March 2020. Echocardiograms were performed pre-chemotherapy (V1) and 1 month post treatment (V2). These were analysed offline using vendor-independent software (TomTec 2D CPA). The study was ethically approved by the Health Research Association (REC reference 18/EM/0177).
Results
A total number of 62 were recruited into the study of which 7 patients passed away during treatment and 5 failed to attend their follow-up appointment at V2. Of the remaining patients, 6 dropped their LV ejection fraction (EF) to < 53% at V2 (G1). In these patients, a significant reduction in the LV ES-GLS (-19.3% vs. -15.3%, p = 0.0041), myoGLS (-16.8% vs. -12.8%, p = 0.0014), LV longitudinal PS strain-rate (-1 1/s vs. 0.78 1/s, p = 0.0063), and LV longitudinal ED strain-rate (1.1 1/s vs. 0.67 1/s, p = 0.026) was seen from V1 to V2. There was no statistically significant change in the other systolic and diastolic strain parameters in this group of patients. In patients with a normal EF at V2 (G2), a reduction in the LV ES-GLS (-20.8% vs. -19.9%, p = 0.013) and myoGLS (-17.9% vs. -16.9%, p = 0.012) was also seen from V1 to V2. Additionally, a deterioration in the LV radial ED strain-rate (-1.37 1/s vs. -1.2 1/s, p = 0.009), LV longitudinal ED strain-rate (0.98 1/s vs. 0.85 1/s, p = 0.01), and LV circumferential ED strain rate (1.62 1/s vs. 1.33 1/s, p = 0.045) was observed.
Conclusion
In G1, a more extensive deterioration (>15%) in the LV ES-GLS, myoGLS, and longitudinal ED strain-rate was evident when compared to G2. The additional reduction in LV early diastolic strain-rate in both patient groups highlights the global insult that anthracyclines can pose on both LV systolic and diastolic function. However, whether these findings translate into future development of cardiotoxicity is not yet known.
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Affiliation(s)
- S Vahabi
- The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Cardiothoracic Services, Newcastle Upon Tyne, United Kingdom of Great Britain & Northern Ireland
| | - E Kharati-Koopaei
- University of Durham, Stockton-on-Tees, United Kingdom of Great Britain & Northern Ireland
| | - M Norouzi
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - J Maddox
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - A Humphreys
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - H Hancock
- Newcastle University, Newcastle-Upon-Tyne, United Kingdom of Great Britain & Northern Ireland
| | - A Zaman
- The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Cardiothoracic Services, Newcastle Upon Tyne, United Kingdom of Great Britain & Northern Ireland
| | - D Austin
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
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8
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Vahabi S, Kharati-Koopaei E, Norouzi M, Maddox J, Humphreys A, Hancock H, Zaman A, Austin D. Right ventricular mechanics in anthracycline chemotherapy: insights into the PROACT PLUS study. Eur Heart J Cardiovasc Imaging 2022. [DOI: 10.1093/ehjci/jeab289.418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: Public hospital(s). Main funding source(s): South Tees Research and Development Fund
Background
Anthracyclines are highly effective chemotherapy agents used in the treatment of many breast and haematological malignancies. However, one of the well-recognised associated risks with their use includes cardiotoxicity which can lead to heart failure and poor prognosis. Most studies have focused on the effects of these agents on the left ventricular systolic function. Right ventricular (RV) mechanics in anthracycline chemotherapy have so far been neglected.
Purpose
The PROACT PLUS study is an observational, prospective, cohort study which assesses the effects of anthracyclines on the RV systolic and diastolic measures using 2 dimensional conventional echocardiography and speckle tracking imaging (STE).
Methods
From October 2018 to March 2020, patients with a new diagnosis of lymphoma or breast cancer undergoing anthracycline chemotherapy were recruited into the PROACT PLUS study. Echocardiography was performed pre-chemotherapy (V1) and 1 month post chemotherapy (V2). Using vendor-independent software (TomTec Imaging Systems, 2D Cardiac Performance Analysis, Unterschleisshiem, Germany), offline analysis of tricuspid annular plane systolic excursion (TAPSE), RV fractional area change (FAC), tricuspid annular systolic velocity (S’), RV global longitudinal strain (RV GLS), RV myocardial longitudinal strain (RV myoGLS), RV free wall strain (RV FWS), RV- and RV free wall peak systolic (PS) strain-rates, end-systolic (ES) strain-rates, early-diastolic (ED) strain-rates and late-diastolic (LD) strain-rates were measured. This study was ethically approved by the Health Research Association (REC reference 18/EM/0177).
Results
62 patients were recruited into this study. Of these, 7 passed away during treatment and 5 failed to attend their follow-up appointment at V2. Of the remaining patients, a significant deterioration in the RV GLS (-25.4% vs. -22.5%, p < 0.0001), RV myoGLS (-22.4% vs. -20.9%, p = 0.005), RV ED strain-rate (1.08 1/s vs. 0.9 1/s, p = 0.01) and RV free wall ED strain-rate (1.24 1/s vs. 1.07 1/s, p = 0.02) was seen between V1 and V2. No statistical significant change was observed in the conventional and other strain measures of RV function. A total number of 6 patients developed left ventricular systolic dysfunction at V2 with ≥ 10% drop in the LV ejection fraction (LVEF) to < 53%. In this group of patients, there was a statistical significant reduction in the RV FWS (-25.5% vs. -22.7%, p = 0.03) which was not evident in the group of patients with preserved LVEF.
Conclusion
These findings suggest that adverse effects of anthracyclines are not purely confined to the LV, and RV systolic and diastolic changes are evident during treatment with anthracyclines, emphasising the global effect of these agents. A comprehensive RV assessment needs to be taken into consideration during the assessment of cardiotoxicity in patients undergoing chemotherapy treatment.
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Affiliation(s)
- S Vahabi
- The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, United Kingdom of Great Britain & Northern Ireland
| | - E Kharati-Koopaei
- University of Durham, Stockton-on-Tees, United Kingdom of Great Britain & Northern Ireland
| | - M Norouzi
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - J Maddox
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - A Humphreys
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - H Hancock
- Newcastle University, Newcastle-Upon-Tyne, United Kingdom of Great Britain & Northern Ireland
| | - A Zaman
- The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Cardiothoracic Services, Newcastle Upon Tyne, United Kingdom of Great Britain & Northern Ireland
| | - D Austin
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
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9
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Vahabi S, Kharati-Koopaei E, Norouzi M, Maddox J, Humphreys A, Hancock H, Zaman A, Austin D. Atrial mechanics in anthracycline chemotherapy: insights into a prospective study. Eur Heart J Cardiovasc Imaging 2022. [DOI: 10.1093/ehjci/jeab289.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: Public hospital(s). Main funding source(s): South Tees Research and Development Fund
Background
In cancer treatment, detection of anthracycline induced cardiotoxicity (AIC) has been dependent on serial cardiac imaging to identify a reduction in left ventricular ejection fraction (LVEF) and more recently LV global longitudinal strain (GLS). However, studies have failed to assess the adverse effects of these agents on other cardiac chambers such as the left (LA) and right atria (RA).
Purpose
The PROACT PLUS study is an observational, prospective, cohort study investigating the effects of anthracyclines on the left and right atrial mechanics using 2 dimensional speckle tracking echocardiography (STE). We hypothesize that anthracyclines can affect the heart as a whole rather than solely affecting the LV.
Methods
From October 2018 to March 2020, patients with a new diagnosis of lymphoma or breast cancer receiving anthracycline chemotherapy were recruited into this study. Echocardiography was performed pre-chemotherapy (V1) and 1 month post-chemotherapy (V2). LA and RA volumes, LA (4-chamber)- and RA GLS, reservoir strains (RS), conduit strains (CS), contractile strains (CoS), peak-systolic (PS) strain-rates, early-diastolic (ED) strain-rates, and late-diastolic (LD) strain-rates were measured offline using vendor-independent software. This study was ethically approved by the Health Research Association (REC reference 18/EM/0177).
Results
A total number of 62 patients were recruited into this study. Unfortunately, 7 patients passed away during their treatment and 5 failed to attend their follow-up appointment at V2. From V1 to V2, there was a significant deterioration in the LA CS (-18.1% vs. -14.5%, p = 0.02) and LA ED strain-rate (-1.24 1/s vs. -0.86 1/s, p = 0.001). There was no other statistical significant change in the LA volume or other strain parameters. Additionally, there was a statistically significant decline in RA GLS (34.9% vs. 30.8%, p = 0.029), RA RS (41.1% vs. 37.1%, p = 0.03), RA CS (-23.8 vs. -20.6, p = 0.05), and RA ED strain-rate (-1.17 vs. -0.99, p = 0.02) with no significant change in the RA volume and other measures of RA strain.
Conclusion
These findings support our hypothesis that anthracyclines exert their cardiotoxic effects on all cardiac chambers including the atria. Whether these changes lead to subsequent permanent structural abnormalities in the atria hence increasing the future risk of atrial arrhythmias, or whether these changes predate subsequent cardiac dysfunction and poor prognosis, remains unknown. Long-term follow up and assessment of atrial mechanics is crucial in better understanding of AIC to help guide the future monitoring and management of patients undergoing cancer treatment.
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Affiliation(s)
- S Vahabi
- Newcastle upon Tyne Hospitals, Newcastle upon Tyne, United Kingdom of Great Britain & Northern Ireland
| | - E Kharati-Koopaei
- University of Durham, Stockton-on-Tees, United Kingdom of Great Britain & Northern Ireland
| | - M Norouzi
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - J Maddox
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - A Humphreys
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - H Hancock
- Newcastle University, Newcastle-Upon-Tyne, United Kingdom of Great Britain & Northern Ireland
| | - A Zaman
- The Newcastle Upon Tyne Hospitals NHS Foundation Trust, Cardiothoracic Services, Newcastle Upon Tyne, United Kingdom of Great Britain & Northern Ireland
| | - D Austin
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
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10
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Vahabi S, Kharati-Koopaei E, Stewart M, Hancock H, Norouzi M, Maddox J, Austin D. The effects of doxorubicin on left and right atrial mechanics in patients with lymphoma. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Despite the associated dose-dependent cardiotoxicity, anthracyclines continue to form the backbone of modern chemotherapy regimens. Speckle Tracking Echocardiography (STE) has been a popular method of quantifying cardiac function but most studies have focused on left ventricular function. Research into the effects of anthracyclines on left atrial (LA) and right atrial (RA) function continues to be neglected.
Purpose
To investigate the effects of doxorubicin, a commonly used anthracycline, on both the LA and RA systolic and diastolic strain and strain-rate parameters in two groups of patients with lymphoma: Group 1 (G1) with a conventional drop in ejection fraction (EF <53%), and Group 2 (G2) without.
Methods
We retrospectively studied 46 patients treated for lymphoma between 2015 and 2018; G1 (n=12) and G2 (n=34). Echocardiograms performed at baseline (T0), mid-chemotherapy (T1), and post-chemotherapy (T2), were analysed by using offline vendor-independent software (TomTec, 2D Cardiac Performance Analysis). Using 2D STE, LA and RA reservoir, conduit and contractile strains, systolic and diastolic strain-rates were measured. Multi-level longitudinal model was used for statistical analysis.This study was ethically approved by the Health Research Association (REC Reference 18/SS/0139).
Results
Median age was 64 years (IQR 51–74 years) in G1, and 65 years (IQR 57–73 years) in G2. In G1, there was no significant change in LA reservoir strain with time, however a significant decline with an average mean difference of −7.52 was seen between T0 to T2 (p=0.016) in G2. LA conduit strain did not significantly change in either group with incremental doses of doxorubicin. However, LA contraction strain was seen to significantly increase in G1 between T1 to T2 (p=0.045) with an average change of 7.23. LA peak systolic strain rate, and late diastolic strain rate did not show any significant change with time in both groups. Yet, a significant increase was seen in LA early diastolic strain rate between T0 to T2 (p=0.017) in G1 but not G2. No significant changes were seen in the RA strain parameters in both groups.
Conclusion
In patient with a reduction in LV function, a significant change was noted in the left atrial contraction strain and early diastolic strain rate with incremental doses of doxorubicin. These changes shows the close relationship between the LA and LV, and the importance of LA in providing a compensatory mechanism for a decline in LV function secondary to anthracycline cardiotoxicity.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- S Vahabi
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom
| | | | - M Stewart
- Auckland District Health Board, Cardiology, Auckland, New Zealand
| | - H Hancock
- Newcastle University, Newcastle-Upon-Tyne, United Kingdom
| | - M Norouzi
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom
| | - J Maddox
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom
| | - D Austin
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom
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Razavi S, Shahmardan M, Nazari M, Norouzi M. Experimental study of the effects of surfactant material and hydrocarbon agent on foam stability with the approach of enhanced oil recovery. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124047] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Vahabi S, Stewart M, Kasim A, Hancock H, Norouzi M, Maddox J, Austin D. P1383 The effects of doxorubicin on left and right ventricular strain in patients with lymphoma: insights from a retrospective study. Eur Heart J Cardiovasc Imaging 2020. [DOI: 10.1093/ehjci/jez319.816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
South Tees Research and Development Fund (UK)
Background
Anthracyclines are a cornerstone in the management of lymphoma. However, their use is associated with cardiotoxicity. Speckle tracking echocardiography (STE) has been established as a valid measure of quantifying cardiac function. However, most studies to this date have focused predominantly on left ventricular (LV) global longitudinal strain (GLS) with only a limited number assessing the right ventricle (RV) and other LV strain parameters.
Purpose
Using 2D STE, we assessed the effects of anthracyclines on LV and RV strain parameters, focusing on LV endocardial (GLS), LV myocardial GLS (myoGLS), LV radial strain (GRS), RV endocardial (RV GLS), myocardial GLS (RV myoGLS), and RV free wall strain (RVFWS).
Methods
We retrospectively collected data on patients treated for lymphoma between 2015-2018. Two groups (G) were defined: those with a conventional drop in LV ejection fraction (EF), (G1, n = 11) and those without (G2, n = 24). Echocardiograms were performed pre-chemotherapy (T0), mid-treatment (T1), and post-chemotherapy (T2) and were analysed offline using vendor-independent software (TomTec 2D CPA). LV and RV strain analysis was performed in both groups. This study was ethically approved by Health Research Association (REC Reference 18/SS/0139).
Results
Mean age was 61 ± 16 years (G1) and 65 ± 12 years (G2). 18% (G1) and 17% (G2) of patients had a history of IHD in each group. Mean cumulative dose of doxorubicin was 280 ± 31 mg/m2 (G1) and 280± 48mg/m2 (G2). In both groups, there was no significant change in LV or RV strain parameters from T0 to T1. In G1, between T1 and T2, patients exhibited a significant deterioration in LV GLS (-19.7 ± 2.6% vs.-15.6 ± 2.5% p < 0.0005), and LV myoGLS (-17.3 ± 2.2% vs. -14.1 ± 2.9% p = 0.02). There was also a measurable decline in RV strain parameters between T1 to T2 (RV GLS, -23.1 ± 4.7% vs. -18.8 ± 4.2% p = 0.028) and (RV myoGLS -21.5 ± 5.2% vs -17.3 ± 3.6% p = 0.013). When analysed from T0 to T2, the changes in RV strain were more marked; RV GLS (-25.2 ± 4.9% vs. -18.8 ± 4.2% p = 0.005), RV myoGLS (-22.4 ± 5.2% vs-17.3 ± 3.6% p = 0.005), and RVFWS (-28.8 ± 5.7% vs. -20.9 ± 6.7% p = 0.001). In G2, no change was observed in LV GLS (-20.4 ± 2.3% vs. -19.6 ± 2.8% p = 0.66), LV myoGLS (-18.8 ± 2.5% vs. -17.5 ± 3.1% p = 0.18), RV GLS (-24.2 ± 2.3% vs. -23.1 ± 2.7% p = 0.42), RV myoGLS (-22.4 ± 2.9% vs. -20.6 ± 2.8% p = 0.09), RVFWS (-26.7 ± 4.6% vs. -25.2 ± 3.6% p = 1.0). GRS did not significantly change in either G1 or G2 during treatment.
Conclusion
In patients with a reduction in LVEF, this analysis demonstrated a significant reduction in LV strain parameters secondary to anthracycline treatment. Novel strain parameters did not change in the normal EF group, or predate EF/GLS decline in those with reduced LVEF. Measurable RV dysfunction was noted in those with LV deterioration, highlighting the global cardiac insult of anthracycline treatment. Preventative and monitoring strategies in cardio-oncology should not overlook RV function.
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Affiliation(s)
- S Vahabi
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - M Stewart
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - A Kasim
- University of Durham, Stockton-on-Tees, United Kingdom of Great Britain & Northern Ireland
| | - H Hancock
- Newcastle University, Newcastle Upon Tyne, United Kingdom of Great Britain & Northern Ireland
| | - M Norouzi
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - J Maddox
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
| | - D Austin
- South Tees Acute Hospitals NHS Foundation Trust, Middlesbrough, United Kingdom of Great Britain & Northern Ireland
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Nejad AA, Talebi Z, Cheraghali D, Shahbani-Zahiri A, Norouzi M. Pulsatile flow of non-Newtonian blood fluid inside stenosed arteries: Investigating the effects of viscoelastic and elastic walls, arteriosclerosis, and polycythemia diseases. Comput Methods Programs Biomed 2018; 154:109-122. [PMID: 29249336 DOI: 10.1016/j.cmpb.2017.11.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 10/27/2017] [Accepted: 11/14/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND AND OBJECTIVE In this study, the interaction of pulsatile blood flow with the viscoelastic walls of the axisymmetric artery is numerically investigated for different severities of stenosis. The geometry of artery is modeled by an axisymmetric cylindrical tube with a symmetric stenosis in a two-dimensional case. The effects of stenosis severity on the axial velocity profile, pressure distribution, streamlines, wall shear stress, and wall radial displacement for the viscoelastic artery are also compared to the elastics artery. Furthermore, the effects of atherosclerosis and polycythemia diseases on the hemodynamics and the mechanical behavior of arterial walls are investigated. METHODS The pulsatile flow of non-Newtonian blood is simulated inside the viscoelastic artery using the COMSOL Multiphysics software (version 5) and by employing the fluid-structure interaction (FSI) method and the arbitrary Lagrangian-Eulerian (ALE) method. Moreover, finite element method (FEM) is used to solve the governing equations on the unstructured grids. For modeling the non-Newtonian blood fluid and the viscoelastic arterial wall, the modified Casson model, and generalized Maxwell model are used, respectively. RESULTS According to the results, with stenosis severity increasing from 25% to 75% at the time of maximum volumetric flow rate, the maximum value of axial velocity and its gradient increase 7.9 and 19.6 times, and the maximum wall shear stress of viscoelastic wall increases 24.2 times in the constriction zone. With the progression of the atherosclerosis disease (fivefold growth of arterial elastic modulus), the wall radial displacement of viscoelastic arterial walls decreases nearly 40%. CONCLUSIONS In this study, axial velocity profile, pressure distribution, streamlines, wall radial displacement, and wall shear stress were examined for different percentages of stenosis (25%, 50%, and 75%). The atherosclerosis disease was investigated by the fivefold growth of viscoelastic arterial elastic modulus and polycythemia disease was examined by the 21-fold increase in the yield stress of the blood fluid. Furthermore, the comparison of results between the elastic and viscoelastic arterial walls shows that the wall radial displacement for viscoelastic artery is lower than that for the elastic artery as much as 21.7% for the severe stenosis of 75%.
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Affiliation(s)
- A Abbas Nejad
- Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
| | - Z Talebi
- Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
| | - D Cheraghali
- Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
| | - A Shahbani-Zahiri
- Department of Mechanical Engineering, University of Birjand, Birjand, Iran
| | - M Norouzi
- Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran.
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Sedaghat M, Shahmardan M, Norouzi M, Heydari M. Effect of Cilia Beat Frequency on Muco-ciliary Clearance. J Biomed Phys Eng 2016; 6:265-278. [PMID: 28144596 PMCID: PMC5219577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 08/22/2015] [Indexed: 10/26/2022]
Abstract
BACKGROUND The airway surface liquid (ASL), which is a fluid layer coating the interior epithelial surface of the bronchi and bronchiolesis, plays an important defensive role against foreign particles and chemicals entering lungs. OBJECTIVE Numerical investigation has been employed to solve two-layer model consisting of mucus layer as a viscoelastic fluid and periciliary liquid layer as a Newtonian fluid to study the effects of cilia beat frequency (CBF) at various amounts of mucus properties on muco-ciliary transport problem. METHODS Hybrid finite difference-lattice Boltzmann-method (FB-LBM) has been used to solve the momentum equations and to simulate cilia forces, and also the PCL-mucus interface more accurately, immersed boundary method (IBM) has been employed. The main contribution of the current study is to use an Oldroyd-B model as the constitutive equation of mucus. RESULTS Our results show that increasing CBF and decreasing mucus viscosity ratio have great effects on mucus flow, but the effect of viscosity ratio is more significant. The results also illustrate that the relation between cilia beat frequency and mean mucus velocity is almost linear and it has similar behavior at different values of viscosity ratio. CONCLUSION Numerical investigation based on hybrid IB-FD-LBM has been used to study the effect of CBF at various mounts of mucus viscosity ratio on the muco-ciliary clearance. The results showed that the effect of viscosity ratio on the muco-ciliary transport process is more significant compared with CBF.
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Affiliation(s)
- M.H. Sedaghat
- Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
| | - M.M. Shahmardan
- Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
| | - M. Norouzi
- Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
| | - M. Heydari
- Research Center for Traditional Medicine and History of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
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Shahmardan MM, Sedaghat MH, Norouzi M. Instability investigation of creeping viscoelastic flows between the rotating cylinders. Theor Found Chem Eng 2015. [DOI: 10.1134/s0040579515050267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Nematollahi A, Moghaddam GH, Jaafari R, Helan JA, Norouzi M. Study on outbreak of Neospora caninum-associated abortion in dairy cows in Tabriz (Northwest Iran) by serological, molecular and histopathologic methods. ASIAN PAC J TROP MED 2014; 6:942-6. [PMID: 24144024 DOI: 10.1016/s1995-7645(13)60168-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2013] [Revised: 09/15/2013] [Accepted: 10/15/2013] [Indexed: 11/29/2022] Open
Abstract
OBJECTIVE To determine Neospora caninum (N. caninum) as a cause of bovine abortion in dairy cows by ELISA, PCR and Pathological methods in Tabriz, Northwest of Iran. METHODS For study of outbreak of neosporosis, blood samples were collected from 76 Holstein aborted dairy cows in Tabriz (Northwest Iran). Antibodies to N. caninum were assayed by using a commercially ELISA kit (IDEXX, USA). IgG against N. caninum were found in 14 (18.4%) cases. Aborted fetuses of these seropositive dams were proposed for histopathological and molecular investigations. Brains, spinal cords and placentas of the fetuses were fixed in 10% buffered formalin for histopathology. Also 5-10 g of brain tissue was sampled for DNA extraction. In 6 out of 14 (42.8%) fetuses, brain tissue was positive in PCR. All dams of these fetuses were serologically seropositive in ELISA test. RESULTS Histopathologically, the lesions consistent with N. caninum were observed in brains, spinal cords and placenta of all fetuses. Lesions in CNS included severe congestion, perivascular and perineuronal edema, status spongiosis, perivascular cuffing, focal gliosis, nourophagy and focal necrosis. There were some Neospora-like cysts in brain. In placentas, severe congestion, perivascular infiltration of mononuclear cells, vascular thrombosis, focal placentitis and necrotic foci in cotyledons were noticed. CONCLUSIONS The results of present study agreed the results of similar studies about serological, histopathological and molecular results of other studies about neosporosis and it seems to support the outbreak of N. caninum-associated abortion in dairy cows in Tabriz (Northwest Iran).
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Affiliation(s)
- A Nematollahi
- Department of Patobiology, Veterinary Collage, University of Tabriz, Tabriz, Iran.
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Norouzi M, Ramezani F, Khedive A, Karimzadeh H, Alavian SM, Malekzadeh R, Montazeri G, Nejatizadeh A, Ziai M, Abedi F, Ataei B, Yaran M, Sayad B, Somi MH, Sarizade G, Sanei-Moghaddam I, Mansour-Ghanaei F, Rafatpanah H, Pourhosseingholi MA, Keyvani H, Shahmoradi S, Saberifiroozi M, Sadeghi M, Geravand B, M Daram, Mahabadi M, Goodarzi Z, Rezaee R, Poortahmasebi V, Fakhari Z, Jazayeri SM. Hepatitis B Virus Genotype D is the Only Genotype Circulating in Iranian Chronic Carriers, the Unique Pattern of Genotypic Homogeneity. ACTA ACUST UNITED AC 2014. [DOI: 10.17554/j.issn.2224-3992.2014.03.418] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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18
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Anwar Bég O, Zueco J, Norouzi M, Davoodi M, Joneidi AA, Elsayed AF. Network and Nakamura tridiagonal computational simulation of electrically-conducting biopolymer micro-morphic transport phenomena. Comput Biol Med 2013; 44:44-56. [PMID: 24377688 DOI: 10.1016/j.compbiomed.2013.10.026] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Revised: 10/24/2013] [Accepted: 10/26/2013] [Indexed: 11/30/2022]
Abstract
Magnetic fields have been shown to achieve excellent fabrication control and manipulation of conductive bio-polymer characteristics. To simulate magnetohydrodynamic effects on non-Newtonian electro-conductive bio-polymers (ECBPs) we present herein a theoretical and numerical simulation of free convection magneto-micropolar biopolymer flow over a horizontal circular cylinder (an "enrobing" problem). Eringen's robust micropolar model (a special case of the more general micro-morphic or "microfluid" model) is implemented. The transformed partial differential conservation equations are solved numerically with a powerful and new code based on NSM (Network Simulation Method) i.e. PSPICE. An extensive range of Hartmann numbers, Grashof numbers, micropolar parameters and Prandtl numbers are considered. Excellent validation is also achieved with earlier non-magnetic studies. Furthermore the present PSPICE code is also benchmarked with an implicit tridiagonal solver based on Nakamura's method (BIONAK) again achieving close correlation. The study highlights the excellent potential of both numerical methods described in simulating nonlinear biopolymer micro-structural flows.
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Affiliation(s)
- O Anwar Bég
- Gort Engovation (Propulsion and Biophysics), Southmere Avenue, Bradford, BD7 3NU, UK.
| | - J Zueco
- Departamento de Ingeniería Térmica y Fluidos, Universidad Politécnica de Cartagena, Murcia, Spain
| | - M Norouzi
- Mechanical Engineering Department, Shahrood University of Technology, Shahrood, Iran
| | - M Davoodi
- Mechanical Engineering Department, Shahrood University of Technology, Shahrood, Iran
| | - A A Joneidi
- Mechanical-Polymer Technology Group, Eindhoven University of Technology, Eindhoven, Netherlands
| | - Assma F Elsayed
- Mathematics Department, Faculty of Education, Ain shams, University, Heliopolis, Cairo, Egypt
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Khedive A, Norouzi M, Ramezani F, Karimzadeh H, Alavian SM, Malekzadeh R, Montazeri G, Nejatizadeh A, Ziaee M, Abedi F, Ataei B, Yaran M, Sayad B, Somi MH, Sarizadeh G, Sanei-Moghaddam I, Mansour-Ghanaei F, Rafatpanah H, Pourhosseingholi MA, Keyvani H, Kalantari E, Saberifiroozi M, Judaki MA, Ghamari S, Daram M, Mahabadi M, Fazeli Z, Goodarzi Z, Poortahmasebi V, Jazayeri SM. Hepatitis B virus surface protein mutations clustered mainly in CTL immune epitopes in chronic carriers: results of an Iranian nationwide study. J Viral Hepat 2013; 20:494-501. [PMID: 23730843 DOI: 10.1111/jvh.12045] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Accepted: 11/27/2012] [Indexed: 12/14/2022]
Abstract
Mutations within the coding region of hepatitis B surface antigen (HBsAg) have been found naturally in chronic carriers. To characterize the mutations of HBsAg from Iranian chronic carriers who were vaccine and/or medication naive. The surface genes from 360 patients were amplified and directly sequenced. The distribution of amino acid substitutions was classified according to different immune epitopes of the surface protein. All isolates belonged to genotype D. 222 (61.6%) of 360 patients contained at least one amino acid substitution. 404 (74.5%) of 542 amino acid changes occurred in different immune epitopes of HBsAg, of which 112 (27.7%) in 32 residues of B-cell epitopes (62 in the 'a' determinant); 111 (27.4%) in 32 residues of T helper; and 197 (48.7%) in 32 residues inside cytotoxic T lymphocyte (CTL) epitopes. One Th (186-197) and two CTL (28-51 and 206-215) epitopes were found to be hotspot motifs for the occurrence of 213 (52.7%) substitutions. 20 stop codons were identified in different epitopes. There was a significant association between amino acid substitutions and anti-HBe seropositivity; however, the correlation between such changes with viral load and ALT levels was not significant. In chronic hepatitis B virus(HBV) carriers, positive selection in particular outside the 'a' determinant appeared to exert influence on the surface proteins. These changes could be immune escape mutations naturally occurring due to the host immune surveillance especially at the T-cell level.
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Affiliation(s)
- A Khedive
- Hepatitis B Molecular Laboratory, Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
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Norouzi M, Ghorashi SA, Abedi F, Nejatizadeh A, Ataei B, Malekzadeh R, Alavian SM, Judaki MA, Ghamari S, Namazi A, Rahimnia R, Khedive A, Jazayeri SM. Identification of Hepatitis B Virus Surface Antigen (HBsAg) Genotypes and Variations in Chronic Carriers from Isfahan Province, Iran. Iran J Public Health 2012; 41:104-11. [PMID: 23113154 PMCID: PMC3481712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2011] [Accepted: 11/18/2011] [Indexed: 11/12/2022]
Abstract
BACKGROUND Hepatitis B virus (HBV) gene and protein variations are frequently been seen in chronic patients. The aims of study were to determine the genotypes as well as the patterns of variations distribution in chronically-infected patients from the central part of Iran. METHODS The surface gene was amplified, sequenced and subsequently aligned using international and national Iranian database. RESULTS All strains belonged to genotype D, subgenotype D1 and subtype ayw2. Of all 62 mutations occurred at 39 nucleotide positions, 31 (50%) were missense (amino acid altering) and 31 (50%) were silent (no amino acid changing). At the amino acid level, 30 substitutions occurred, however, 3 were in positions 122 and 127, corresponded to subtypic determination. 22 (73%) out of 30 amino acid mutations occurred in different immune epitopes within surface protein, of which 12 (54.54%) in B cell epitopes in 10 residues; 5 (45.45%) in T helper epitopes in positions; 5 (22.73%) in inside CTL epitopes in 4 residues. CONCLUSION The distribution of amino acid mutations as well as the ratio between silent and missense nucleotide mutations showed a narrowly focused immune pressure had already been on the surface protein in these patients, led to the emergence of escape mutants in these patients.
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Affiliation(s)
- M Norouzi
- Iranian National Institute for Genetic Engineering and Biotechnology, Tehran, Iran
| | - SA Ghorashi
- Iranian National Institute for Genetic Engineering and Biotechnology, Tehran, Iran
| | - F Abedi
- Research center for infectious diseases and tropical medicine, School of Medicine, Hormozgan University of Medical Sciences, Iran
| | - A Nejatizadeh
- Research center for infectious diseases and tropical medicine, School of Medicine, Hormozgan University of Medical Sciences, Iran
| | - B Ataei
- Infectious Diseases and Tropical Medicine Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - R Malekzadeh
- Digestive Disease Research Center, Shariati Hospital, Tehran, Iran
| | - SM Alavian
- Baqiyatallah University of Medical Sciences, Baqiyatallah Research Centre forGastroenterology and Liver Disease, Tehran, Iran
| | - MA Judaki
- Hepatitis B Molecular Laboratory, Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - S Ghamari
- Hepatitis B Molecular Laboratory, Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - A Namazi
- Hepatitis B Molecular Laboratory, Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - R Rahimnia
- Hepatitis B Molecular Laboratory, Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - A Khedive
- Hepatitis B Molecular Laboratory, Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - SM Jazayeri
- Hepatitis B Molecular Laboratory, Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran,Corresponding Author: Tel: 0098-21 88950187, E-mail address:
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Sayad B, Anvari FA, Alavian SM, Norouzi M, Hamzelooie M, Shirvani M, Pourhoseingholi A, Khedive A, Ghamari S, Judaki MA, Jazayeri SM. Correlation of Hepatitis B surface antigen mutations with clinical status of the chronically infected patients from Kermanshah, West of Iran. MINERVA GASTROENTERO 2012; 58:9-18. [PMID: 22419000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
AIM Hepatitis B virus (HBV) genetic and protein variations have been found in chronic HBV infected patients who did not receive any treatment and active or passive immunizations. The aims of this study were to determine the genotypes as well as the patterns of variations distribution in chronically infected patients from the west part of Iran. METHODS Forty-six people with chronic HBV infection were enrolled in the study. The surface genes were amplified, sequenced and subsequently aligned using international and national Iranian database. RESULTS All strains belonged to genotype D, subgenotype D1 and subtype ayw2. Of all 116 "mutations" that occurred at 59 nucleotide positions, 49 (42.2 %) were missense (amino acid altering) and 67 (57.7%) were silent (no amino acid changing), respectively. At the amino acid level, 38 (79.1%) out of 48 amino acid mutations occurred in different immune epitopes within the surface proteins, of which 2 (5.2%) occurred in B cell; 12 (31.5%) in T helper and 24 (63.1%) inside CTL epitopes. There were significant associations between amino acid mutations (especially within immune epitopes) and anti-HBe positivity and increased ALT levels (P values: 0.014 and 0.04, respectively). CONCLUSION The distribution of amino acid mutations as well as the ratio between silent and missense nucleotide mutations showed that a narrowly focused immune pressure had already been on the surface protein T cell epitopes (94.9% of mutations), particularly CTL epitopes which led to the emergence of escape mutants in these patients.
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Affiliation(s)
- B Sayad
- Kermanshah Liver Diseases and Hepatitis Reseaerch Center, Kermanshah Universityof Medical Sciences, Kermanshah, Iran
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Norouzi M, Kayhani MH, Nobari MRH, Talebi F. Analytical investigation of viscoelastic creeping flow and heat transfer inside a curved rectangular duct. Theor Found Chem Eng 2011. [DOI: 10.1134/s0040579511010052] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Norouzi M, Doroodian MR, Salajegheh S. Optimum dose of ketamine for prevention of postanesthetic shivering; a randomized double-blind placebo-controlled clinical trial. Acta Anaesthesiol Belg 2011; 62:33-36. [PMID: 21612143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Our objective was to investigate the efficacy and the optimum dosage of ketamine for post anesthetic shivering prevention. One-hundred and twenty patients (ASA I-II) scheduled for elective orthopedic surgery were randomly allocated to receive ketamine in 3 groups ; groups A (0.125 mg/Kg), groups B (0.25 mg/Kg) and C (0.5 mg/Kg) along with those receiving 0.9% normal saline as the placebo group. Tympanic temperature was measured immediately after induction of anesthesia, 30 min after induction, before administration of the study drug and by the end of the surgery. The four groups did not differ significantly in their hemodynamic parameters and tympanic temperature. The frequency of shivering was significantly less in groups B (0.25 mg/Kg) and C (0.5 mg/Kg) than in groups A (0.125 mg/Kg) and D (placebo). In addition recovery, extubation time and hallucination was observed to be less in group B compared to group A. Prophylactic 0.25 and 0.5 mg/kg ketamine was found to be effective in preventing postanesthetic shivering with a better response observed with 0.25 mg/kg dosage.
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Affiliation(s)
- M Norouzi
- Department of Anesthesiology, Kerman University of Medical Sciences, Kerman, Iran
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Doroudian MR, Norouzi M, Esmailie M, Tanhaeivash R. Dexamethasone in preventing post-dural puncture headache: a randomized, double-blind, placebo-controlled trial. Acta Anaesthesiol Belg 2011; 62:143-146. [PMID: 22145255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Spinal anesthesia is major complication is Post-Dural Puncture Headache (PDPH) which is an intense and debilitating event. We decided to assess if intravenous administration of dexamethasone can decrease the incidence and/or intensity of this kind of headache. For this purpose 178 patients, who were supposed to undergo lower extremity orthopedic surgery, were enrolled in the study . Before spinal anesthesia was initiated, the first group (DXM-group) received 2 mL intravenous (i.v) dexamethasone whereas the second group (PCB-group) received 2 mL i.v. normal saline. After termination of surgery, a 7 days follow-up started to observe the possible occurrence and intensity of PDPH. There was no statistically significant difference between DMX and PCB groups regarding the incidence of PDPH. However, the intensity of headache differed between the two groups being less severe if IV dexamethasone had been given prophylactically. Dexamethasone can be used to decrease the severity of PDPH in patients who receive spinal anesthesia.
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Affiliation(s)
- M R Doroudian
- Department of Anesthesiology, Kerman Medical University, Kerman, Iran.
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Araee M, Norouzi M, Habibi G, Sheikhvatan M. Toxicity of Trigonella foenum graecum (Fenugreek) in bone marrow cell proliferation in rat. Pak J Pharm Sci 2009; 22:126-130. [PMID: 19339220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Fenugreek has a wide range of medical applications and its medicinal use has been clear in several studies, however, few studies are available on effects on haematopoietic stem cell of bone marrow. The goal of the present study was to investigate the effect of Fenugreek on fetal macroscopic diameters and microscopic bone marrow cell histological changes in its teratogenic dosages. Fenugreek decoction was dissolved in 1.5 milliliter distilled water and injected intraperitoneumly in three dosages of 0.8 g/kg, 1.6 g/kg, and 3.2 g/kg for three groups of Wistar female rats mated by Wistar male. For another group (as control group) only 1.5 milliliter distilled water was injected. Bone marrow tissue was prepared from rat fetus and was cut using a microtome and stained with hematoxylin and eosin. Sections were evaluated for changes using light microscope. LD(50) for the measurement of teratogenic dosage of fenugreek was 4.1 and 3.5 g/kg in female and male rat, respectively. There was a positive relation between the injected drug dosage and fetal mortality rate. Among all fetal diameters, ear to ear diameter was decreased in groups received Fenugreek decoction. The severity of stem cell histological changes caused by 3.2 g/kg drug injection was lower than distilled water injection and in evaluation of other cells, differences in the severity of histological changes across three groups with different drug dosages and control group was detected. Fenugreek in teratogenic dosages can decrease the severity of bone marrow cell proliferation and increase fetal mortality rate.
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Affiliation(s)
- M Araee
- Department of Biology, Islamic Azad University, Tehran, Iran
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Gokul S, Ahmed Z, Norouzi M, Peedell C. Survival outcomes in WHO PS 2 patients and elderly patients with stage IIIB/IV non small cell lung cancer treated with carboplatin and gemcitabine. Lung Cancer 2009. [DOI: 10.1016/s0169-5002(09)70022-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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