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Li G, Zhou M, Huang X, Ji C, Fan T, Xu J, Xiong H, Huang Y. Time delays between physiological signals in interpreting the body's responses to intermittent hypoxia in obstructive sleep apnea. Physiol Meas 2024; 45:055008. [PMID: 38688301 DOI: 10.1088/1361-6579/ad45ac] [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: 11/08/2023] [Accepted: 04/30/2024] [Indexed: 05/02/2024]
Abstract
Objective.Intermittent hypoxia, the primary pathology of obstructive sleep apnea (OSA), causes cardiovascular responses resulting in changes in hemodynamic parameters such as stroke volume (SV), blood pressure (BP), and heart rate (HR). However, previous studies have produced very different conclusions, such as suggesting that SV increases or decreases during apnea. A key reason for drawing contrary conclusions from similar measurements may be due to ignoring the time delay in acquiring response signals. By analyzing the signals collected during hypoxia, we aim to establish criteria for determining the delay time between the onset of apnea and the onset of physiological parameter response.Approach.We monitored oxygen saturation (SpO2), transcutaneous oxygen pressure (TcPO2), and hemodynamic parameters SV, HR, and BP, during sleep in 66 patients with different OSA severity to observe body's response to hypoxia and determine the delay time of above parameters. Data were analyzed using the Kruskal-Wallis test, Quade test, and Spearman test.Main results.We found that simultaneous acquisition of various parameters inevitably involved varying degrees of response delay (7.12-25.60 s). The delay time of hemodynamic parameters was significantly shorter than that of SpO2and TcPO2(p< 0.01). OSA severity affected the response delay of SpO2, TcPO2, SV, mean BP, and HR (p< 0.05). SV delay time was negatively correlated with the apnea-hypopnea index (r= -0.4831,p< 0.0001).Significance.The real body response should be determined after removing the effect of delay time, which is the key to solve the problem of drawing contradictory conclusions from similar studies. The methods and important findings presented in this study provide key information for revealing the true response of the cardiovascular system during hypoxia, indicating the importance of proper signal analysis for correctly interpreting the cardiovascular hemodynamic response phenomena and exploring their physiological and pathophysiological mechanisms.
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Affiliation(s)
- Geng Li
- School of Biomedical Engineering, Capital Medical University, Beijing 100069, People's Republic of China
- Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing 100069, People's Republic of China
| | - Mengwei Zhou
- School of Biomedical Engineering, Capital Medical University, Beijing 100069, People's Republic of China
- Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing 100069, People's Republic of China
| | - Xiaoqing Huang
- School of Biomedical Engineering, Capital Medical University, Beijing 100069, People's Republic of China
- Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing 100069, People's Republic of China
| | - Changjin Ji
- School of Biomedical Engineering, Capital Medical University, Beijing 100069, People's Republic of China
- Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing 100069, People's Republic of China
| | - Tingting Fan
- School of Biomedical Engineering, Capital Medical University, Beijing 100069, People's Republic of China
- Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing 100069, People's Republic of China
| | - Jinkun Xu
- Department of Otorhinopharyngology-Head and Neck Surgery, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing 102218, People's Republic of China
| | - Huahui Xiong
- School of Biomedical Engineering, Capital Medical University, Beijing 100069, People's Republic of China
- Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing 100069, People's Republic of China
| | - Yaqi Huang
- School of Biomedical Engineering, Capital Medical University, Beijing 100069, People's Republic of China
- Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing 100069, People's Republic of China
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Bradicich M, Siciliano M, Donfrancesco F, Cherneva R, Ferraz B, Testelmans D, Sánchez-de-la-Torre M, Randerath W, Schiza S, Cruz J. Sleep and Breathing Conference highlights 2023: a summary by ERS Assembly 4. Breathe (Sheff) 2023; 19:230168. [PMID: 38020339 PMCID: PMC10644110 DOI: 10.1183/20734735.0168-2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 10/08/2023] [Indexed: 12/01/2023] Open
Abstract
This paper presents some of the highlights of the Sleep and Breathing Conference 2023 https://bit.ly/46MxJml.
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Affiliation(s)
- Matteo Bradicich
- Department of Pulmonology, University Hospital Zurich, Zurich, Switzerland
- Department of Internal Medicine, Spital Zollikerberg, Zollikerberg, Switzerland
| | - Matteo Siciliano
- Università Cattolica del Sacro Cuore, Campus di Roma, Rome, Italy
- Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- These authors contributed equally
| | - Federico Donfrancesco
- Università Cattolica del Sacro Cuore, Campus di Roma, Rome, Italy
- Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
- These authors contributed equally
| | - Radostina Cherneva
- Medical University, University Hospital “Ivan Rilski”, Respiratory Intensive Care Unit, Sofia, Bulgaria
- These authors contributed equally
| | - Beatriz Ferraz
- Pulmonology Department, Centro Hospitalar Universitário de Santo António, Porto, Portugal
- These authors contributed equally
| | - Dries Testelmans
- Department of Pneumology, University Hospitals Leuven, Leuven, Belgium
- These authors contributed equally
| | - Manuel Sánchez-de-la-Torre
- Respiratory Department, Hospital Universitari Arnau de Vilanova-Santa María, IRB Lleida, Lleida, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - Winfried Randerath
- Institute of Pneumology, University Cologne, Bethanien Hospital, Solingen, Germany
- These authors contributed equally
| | - Sophia Schiza
- Department of Respiratory Medicine, School of Medicine, University of Crete, Heraklion, Greece
- These authors contributed equally
| | - Joana Cruz
- Center for Innovative Care and Health Technology (ciTechCare), School of Health Sciences (ESSLei), Polytechnic of Leiria, Leiria, Portugal
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Bonsignore MR, La Rovere MT. Sympathetic activation in patients with heart failure and central sleep apnoea: is it friend or foe? Eur Respir J 2023; 61:61/2/2202170. [PMID: 36758996 DOI: 10.1183/13993003.02170-2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 11/12/2022] [Indexed: 02/11/2023]
Affiliation(s)
- Maria R Bonsignore
- PROMISE Department, University of Palermo, Palermo, Italy
- IRIB-CNR, Palermo, Italy
- Respiratory Division, V Cervello Hospital, Ospedali Riuniti Villa Sofia Cervello, Palermo, Italy
| | - Maria Teresa La Rovere
- Department of Cardiology, Istituti Clinici Scientifici Maugeri, IRCCS, Istituto Scientifico di Montescano, Montescano, Italy
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Dupuy-McCauley KL, Mudrakola HV, Colaco B, Arunthari V, Slota KA, Morgenthaler TI. A comparison of 2 visual methods for classifying obstructive vs central hypopneas. J Clin Sleep Med 2021; 17:1157-1165. [PMID: 33583493 DOI: 10.5664/jcsm.9140] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES Rules for classifying apneas as obstructive, central, or mixed are well established. Although hypopneas are given equal weight when calculating the apnea-hypopnea index, classification is not standardized. Visual methods for classifying hypopneas have been proposed by the American Academy of Sleep Medicine and by Randerath et al (Sleep. 2013;36[3]:363-368) but never compared. We evaluated the clinical suitability of the 2 visual methods for classifying hypopneas as central or obstructive. METHODS Fifty hypopnea-containing polysomnographic segments were selected from patients with clear obstructive or clear central physiology to serve as standard obstructive or central hypopneas. These 100 hypopnea-containing polysomnographic segments were deidentified, randomized, and scored by 2 groups. We assigned 1 group to use the American Academy of Sleep Medicine criteria and the other the Randerath algorithm. After a washout period, re-randomized hypopnea-containing polysomnographic segments were scored using the alternative method. We determined the accuracy (agreement with standard), interrater (Fleiss's κ), and intrarater agreement (Cohen's κ) for obtained scores. RESULTS Accuracy of the 2 methods was similar: 67% vs 69.3% for Randerath et al and the American Academy of Sleep Medicine, respectively. Cohen's κ was 0.01-0.75, showing that some raters scored similarly using the 2 methods, while others scored them markedly differently. Fleiss's κ for the American Academy of Sleep Medicine algorithm was 0.32 (95% confidence interval, 0.29-0.36) and for the Randerath algorithm was 0.27 (95% confidence interval, 0.23-0.30). CONCLUSIONS More work is needed to discover a noninvasive way to accurately characterize hypopneas. Studies like ours may lay the foundation for discovering the full spectrum of physiologic consequences of obstructive sleep apnea and central sleep apnea.
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Orr JE, Ayappa I, Eckert DJ, Feldman JL, Jackson CL, Javaheri S, Khayat RN, Martin JL, Mehra R, Naughton MT, Randerath WJ, Sands SA, Somers VK, Badr MS. Research Priorities for Patients with Heart Failure and Central Sleep Apnea. An Official American Thoracic Society Research Statement. Am J Respir Crit Care Med 2021; 203:e11-e24. [PMID: 33719931 PMCID: PMC7958519 DOI: 10.1164/rccm.202101-0190st] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Background: Central sleep apnea (CSA) is common among patients with heart failure and has been strongly linked to adverse outcomes. However, progress toward improving outcomes for such patients has been limited. The purpose of this official statement from the American Thoracic Society is to identify key areas to prioritize for future research regarding CSA in heart failure. Methods: An international multidisciplinary group with expertise in sleep medicine, pulmonary medicine, heart failure, clinical research, and health outcomes was convened. The group met at the American Thoracic Society 2019 International Conference to determine research priority areas. A statement summarizing the findings of the group was subsequently authored using input from all members. Results: The workgroup identified 11 specific research priorities in several key areas: 1) control of breathing and pathophysiology leading to CSA, 2) variability across individuals and over time, 3) techniques to examine CSA pathogenesis and outcomes, 4) impact of device and pharmacological treatment, and 5) implementing CSA treatment for all individuals Conclusions: Advancing care for patients with CSA in the context of heart failure will require progress in the arenas of translational (basic through clinical), epidemiological, and patient-centered outcome research. Given the increasing prevalence of heart failure and its associated substantial burden to individuals, society, and the healthcare system, targeted research to improve knowledge of CSA pathogenesis and treatment is a priority.
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Naughton MT. Periodic breathing: Fine tuning the phenotype. Respirology 2020; 25:240-241. [DOI: 10.1111/resp.13657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Accepted: 07/15/2019] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew T. Naughton
- Department of Respiratory Medicine, Alfred HospitalMonash University Melbourne VIC Australia
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