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• W2413362006 abstract "Free AccessVeteransThe Association between Nocturnal Cardiac Arrhythmias and Sleep-Disordered Breathing: The DREAM Study Bernardo J. Selim, MD, Brian B. Koo, MD, Li Qin, PhD, Sangchoon Jeon, PhD, Christine Won, MD, Nancy S. Redeker, PhD, Rachel J. Lampert, MD, John P. Concato, MD, Dawn M. Bravata, MD, Jared Ferguson, BS, Kingman Strohl, MD, Adam Bennett, Andrey Zinchuk, MD, Henry K. Yaggi, MD Bernardo J. Selim, MD Section of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN Search for more papers by this author , Brian B. Koo, MD Department of Neurology, Connecticut Veterans Affairs Health System, West Haven, CT Search for more papers by this author , Li Qin, PhD Yale Center of Analytical Science (YCAS) Yale School of Epidemiology and Public Health, New Haven, CT Search for more papers by this author , Sangchoon Jeon, PhD Division of Acute Care/Health Systems, Yale School of Nursing, New Haven, CT Search for more papers by this author , Christine Won, MD Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine Yale University School of Medicine, New Haven, CT Search for more papers by this author , Nancy S. Redeker, PhD Division of Acute Care/Health Systems, Yale School of Nursing, New Haven, CT Search for more papers by this author , Rachel J. Lampert, MD Department of Internal Medicine, Section of Cardiology/Electrophysiology, Yale University School of Medicine, New Haven, CT Search for more papers by this author , John P. Concato, MD Department of Internal Medicine, Yale University School of Medicine, New Haven, CT Clinical Epidemiology Research Center (CERC), VA Connecticut Healthcare System, West Haven, CT Search for more papers by this author , Dawn M. Bravata, MD Departments of Internal Medicine, Indiana University School of Medicine and the Regenstrief Institute, Indianapolis, IN Center of Excellence on Implementing Evidence-based Practice (CIEBP), Richard L. Roudebush VA Medical Center, Indianapolis IN Search for more papers by this author , Jared Ferguson, BS Departments of Internal Medicine, Indiana University School of Medicine and the Regenstrief Institute, Indianapolis, IN Search for more papers by this author , Kingman Strohl, MD Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, OH Search for more papers by this author , Adam Bennett Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine Yale University School of Medicine, New Haven, CT Search for more papers by this author , Andrey Zinchuk, MD Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine Yale University School of Medicine, New Haven, CT Department of Internal Medicine, Yale University School of Medicine, New Haven, CT Clinical Epidemiology Research Center (CERC), VA Connecticut Healthcare System, West Haven, CT Search for more papers by this author , Henry K. Yaggi, MD Address correspondence to: H. Klar Yaggi, MD, MPH, 300 Cedar Street, New Haven, CT 06443(203) 785-4163(203) 785-3826 E-mail Address: [email protected] Department of Internal Medicine, Section of Pulmonary, Critical Care, and Sleep Medicine Yale University School of Medicine, New Haven, CT Department of Internal Medicine, Yale University School of Medicine, New Haven, CT Clinical Epidemiology Research Center (CERC), VA Connecticut Healthcare System, West Haven, CT Search for more papers by this author Published Online:June 15, 2016https://doi.org/10.5664/jcsm.5880Cited by:28SectionsAbstractPDF ShareShare onFacebookTwitterLinkedInRedditEmail ToolsAdd to favoritesDownload CitationsTrack Citations AboutABSTRACTStudy Objectives:To determine whether sleep-disordered breathing (SDB) is associated with cardiac arrhythmia in a clinic-based population with multiple cardiovascular comorbidities and severe SDB.Methods:This was a cross-sectional analysis of 697 veterans who underwent polysomnography for suspected SDB. SDB was categorized according to the apnea-hypopnea index (AHI): none (AHI < 5), mild (5 ≥ AHI < 15), and moderate-severe (AHI ≥ 15). Nocturnal cardiac arrhythmias consisted of: (1) complex ventricular ectopy, (CVE: non-sustained ventricular tachycardia, bigeminy, trigeminy, or quadrigeminy), (2) combined supraventricular tachycardia, (CST: atrial fibrillation or supraventricular tachycardia), (3) intraventricular conduction delay (ICD), (4) tachyarrhythmias (ventricular and supraventricular), and (5) any cardiac arrhythmia. Unadjusted, adjusted logistic regression, and Cochran-Armitage testing examined the association between SDB and cardiac arrhythmias. Linear regression models explored the association between hypoxia, arousals, and cardiac arrhythmias.Results:Compared to those without SDB, patients with moderate-severe SDB had almost three-fold unadjusted odds of any cardiac arrhythmia (2.94; CI 95%, 2.01–4.30; p < 0.0001), two-fold odds of tachyarrhythmias (2.16; CI 95%,1.47–3.18; p = 0.0011), two-fold odds of CVE (2.01; 1.36–2.96; p = 0.003), and two-fold odds of ICD (2.50; 1.58–3.95; p = 0.001). A linear trend was identified between SDB severity and all cardiac arrhythmia subtypes (p value linear trend < 0.0001). After adjusting for age, BMI, gender, and cardiovascular diseases, moderate-severe SDB patients had twice the odds of having nocturnal cardiac arrhythmias (2.24; 1.48–3.39; p = 0.004). Frequency of obstructive respiratory events and hypoxia were strong predictors of arrhythmia risk.Conclusions:SDB is independently associated with nocturnal cardiac arrhythmias. Increasing severity of SDB was associated with an increasing risk for any cardiac arrhythmia.Citation:Selim BJ, Koo BB, Qin L, Jeon S, Won C, Redeker NS, Lampert RJ, Concato JP, Bravata DM, Ferguson J, Strohl K, Bennett A, Zinchuk A, Yaggi HK. The association between nocturnal cardiac arrhythmias and sleep-disordered breathing: the DREAM study. J Clin Sleep Med 2016;12(6):829–837.INTRODUCTIONSleep-disordered breathing (SDB) affects 17% of adults in the general U.S. population.1 The prevalence of SDB among U.S. veterans is estimated to be as high as four times that of the general population due to major risk factors for SDB that are common among veterans, including male gender, increasing age, smoking, obesity, and cardiovascular comorbidity.2 SDB has been linked to a number of cardiovascular outcomes, including hypertension, myocardial infarction, congestive heart failure, cardiovascular mortality, and sudden death.3–6 Importantly, a circadian pattern has been observed in the occurrence of sudden death in SDB, such that the risk for sudden death doubles from midnight to 6 AM among patients with SDB compared to those without.5 A putative association between SDB and nocturnal cardiac arrhythmias may, in part, explain this increased risk for nocturnal sudden death.7,8BRIEF SUMMARYCurrent Knowledge/Study Rationale: The association between sleep-disordered breathing (SDB) and cardiac arrhythmias has been examined in community-based with self-reported morbidities but not in clinic-based populations that tend to have more severe sleep-disordered breathing and higher rates of cardiovascular comorbidity.Study Impact: The association between SDB and nocturnal cardiac arrhythmia may, in part, explain the observed increased risk in nocturnal sudden death among patients with sleep apnea. Understanding the nature of the association between sleep apnea and cardiac arrhythmias also has the potential to change the practice of polysomnographic interpretation, leading to a more systematic approach to the detection and quantifications of cardiac events.SDB is associated with a number of physiologic perturbations that may plausibly increase the risk of nocturnal cardiac arrhythmias including: repetitive episodes hypoxia and nocturnal sympathetic hyperactivity which in turn have been associated with ventricular ectopy, non-sustained ventricular tachycardia.7,9 Additionally, obstructive sleep apnea (OSA), a common form of SDB consisting of repetitive upper airway obstruction, leads to significant intrathoracic pressure swings contributing to increased atrial and ventricular cardiac wall stress. This increase in ventricular afterload will predispose to transient acute ischemia in the short term and to cardiac remodeling in the long term, increasing the risk for cardiac arrhythmias.10–12Surprisingly, few studies have been conducted to clarify the association between SDB and nocturnal cardiac arrhythmias. Data are limited regarding the magnitude of risk from clinic-based populations who tend to have multiple cardiovascular comorbidities and more severe SDB than population-based studies. We analyzed data from a clinic-based prospective observational cohort of veterans to further understand the relationship between SDB and nocturnal cardiac arrhythmia. Our objective was to determine whether SDB is independently associated nocturnal cardiac arrhythmias and whether increasing severity of SDB is associated with an increasing risk of these events. As a secondary analysis, we explored which selected polysomnographic (PSG) measures of SDB best predict risk of arrhythmias.METHODSSubjects/Study DesignThe study sample was derived from a parent prospective observational cohort study named the Determining Risk of vascular Events by Apnea Monitoring (DREAM) study. The rationale and methods of this parent study has been previously published.13 In this study, 1,840 patients underwent comprehensive sleep testing for SDB at 3 VA medical centers (VA Connecticut Healthcare System, West Haven, CT; Richard L. Rhoudebush VAMC, Indianapolis, IN; Louis Stokes VAMC, Cleveland, OH) and were followed for cardiovascular outcomes. The current study is a cross-sectional analysis of the first 982 consecutive veteran patients referred for PSG, a subgroup of DREAM patients who also underwent additional detailed cardiac arrhythmia evaluation. Subjects were excluded if diagnostic PSG data were < 2 h duration, referral for PSG was for reasons other than suspected sleep-disordered breathing (e.g., narcolepsy or movement disorder), or referral was for therapeutic PSG study only (e.g., continuous positive airway pressure titration). The study was approved by the Human Investigation Committee at all 3 VA medical centers.Polysomnographic Data CollectionRaw PSG data were acquired at the 3 clinical centers, processed, and rescored by trained polysomnologists at a central reading center at the Clinical Epidemiology Research Center, West Haven, CT. The PSG montage included recording of electroencephalogram (F3/4-M1, C3/4-M1, O1/2-M1), bilateral electro-oculogram, submental, and anterior tibialis electromyo-gram, electrocardiogram (a single modified electrocardiograph lead II, sampled at 500 Hz), nasal pressure transduction, oronasal thermistry, thoracic and abdominal respiratory inductance plethysmography, and a finger probe for oxygen saturation (sampling frequency of 25 Hz). Apneas were defined by a decrease of peak thermal sensor ≥ 90% of baseline for ≥ 10 s, and were classified as obstructive or central, if respiratory effort was present or absent, respectively. Mixed apneas were scored when apneas were associated with absent inspiratory effort in the initial portion of the event, followed by resumption of inspiratory effort in the second portion of the event. Hypopneas were defined as a nasal pressure drop > 30% from baseline, lasting ≥ 10 s, and associated with oxygen desaturation ≥ 4%.14 The apnea-hypopnea index (AHI) was enumerated as the sum of all apneas and hypopneas divided by total sleep time in hours. Participants were categorized according to severity of SDB by the apnea-hypopnea index (AHI): (1) no SDB (AHI < 5); (2) mild SDB (5 ≤ AHI < 15); and (3) moderate-severe SDB (AHI ≥ 15). The obstructive apnea-hypopnea index (OAHI) is defined as the number of apneas (obstructive and mixed) and hypopneas per hour of sleep. Time spent below 90% of oxygen saturation (T < 90%) represented the percentage of the total sleep time spent below 90% oxygen saturation. Oxygen desaturation index 4% (ODI 4%) was described as the number of oxygen desaturations ≥ 4% per hour of sleep. Finally, arousals were scored when an abrupt shift of EEG frequency occurred (including alpha, theta, or frequencies > 16 Hz) for ≥ 3 s, with ≥ 10 s of preceding stable sleep. Scoring arousals during REM sleep required additional increases in submental electromyogram (EMG) lasting at least one second.14,15 Arousal index represented the number of respiratory and nonrespiratory arousals per hour of sleep.Cardiac Arrhythmia OutcomesRaw data from PSG studies were exported into European Data Files (EDF), a standard file format designed for exchange and storage of biological time series data. The PSG electrocardiogram (ECG) data and the respiratory wave forms from these files were analyzed by Somte ECG interpretation software (Somte, Compumedics). This software displayed the electrocardiographic tracing of the comprehensive sleep study in a “Holter-type” visual format, allowing manual as well as an automatic ECG analysis, including QRS complex classification, and arrhythmia detection/classification.All ECG data were reviewed manually for specific arrhythmia types; events were quantified, and categorized by one of the investigators (BJS), blinded to respiratory events and clinical data, with arbitration by a cardiac electrophysiologist (RL) when necessary. Categories included supraventricular arrhythmias, ventricular arrhythmias and conduction delay arrhythmias. Supraventricular arrhythmias included: (1) premature atrial contraction (PAC ≥ 5 events per hour, measured in studies without atrial fibrillation); (2) atrial fibrillation or flutter (occurring intermittently or continuously); (3) supraventricular tachycardia, and (4) and a composite variable of combined supraventricular tachycardia (combination of atrial fibrillation and supraventricular tachycardia, excluding PACs). Ventricular arrhythmias included: (1) isolated premature ventricular contractions (PVC ≥ 5 events/h); (2) bigeminy/trigeminy/ quadrigeminy; (3) nonsustained ventricular tachycardia; and (4) a composite variable of complex ventricular ectopy (i.e., bigeminy, trigeminy, quadrigeminy or nonsustained ventricular tachycardia, excluding isolated PVCs). Conduction delay arrhythmias included: (1) sinus pause (> 3 s), (2) second degree atrioventricular block, (3) third degree atrioventricular block, (4) intraventricular conduction delay (QRS > 120 msec), and (5) tachyarrhythmia (ventricular or supraventricular). Finally, any nocturnal cardiac arrhythmias included the following arrhythmias: complex ventricular ectopy, or combined supraventricular tachycardia, or intraventricular conduction delay.Covariate Data CollectionA number of clinical variables were collected at baseline: (1) demographic and anthropometric variables included age, gender, race, body mass index; (2) cardiovascular disease risk factors included diabetes, hypertension, (determined by either physician diagnosis or receiving appropriate medication), smoking history (≥ 20 pack year history), high density lipo-protein levels (HDL), and low density lipoprotein levels; and (3) cardiovascular diseases included stroke, angina, coronary artery disease, myocardial infarction, congestive heart failure, angioplasty, coronary artery bypass graft (CABG), pacemaker or implantable cardioverter defibrillator.Statistical AnalysisBaseline demographic and clinical characteristics of patients were described using mean ± standard deviation for continuous variables, and frequency counts for categorical variables. ANOVA testing was used to compare mean values, and χ2 testing to compare frequency of categorical values across SDB severity groups. Kruskal-Wallis testing was used to compare median polysomnographic values among groups. All subtypes of arrhythmias were analyzed as dichotomous variables. We used Cochran-Armitage testing for linear trend to examine whether increased severity of SDB is associated with increased risk of nocturnal cardiac arrhythmias.We used logistic regression analysis to examine the association between SDB and nocturnal cardiac arrhythmias subtypes (dichotomous outcome). Multivariable adjustment in a forward stepwise modeling approach was first used with demographic variables, adding later cardiovascular risk factors, followed by cardiovascular diseases.Finally, as a secondary analysis, we examined the association between selected polysomnographic measures of sleep-disordered breathing and nocturnal cardiac arrhythmias using linear regression models.Assuming an estimated arrhythmia prevalence of 40% in the reference group (patients without SDB), the study had more than 95% power to detect a minimum of 20% increase in prevalence of nocturnal cardiac arrhythmias in our sample size (PASS software, 2008). All the analyses were performed using the SAS (9.2 version) statistical package, and a p value < 0.05 was considered statistically significant.RESULTSAfter screening 982 consecutive veteran patients referred for PSG between 2000 and 2004, 697 patients fulfilled these inclusion and exclusion criteria (Figure 1). Among these 697 participants; 94.5% were male and 79.1% Caucasian with a mean age of 58.7 ± 12.1 years. Table 1 shows the baseline characteristics of patients without SDB (reference group), with mild SDB, and with moderate-severe SDB. As expected, increasing age, BMI, and male gender, were associated with increase severity of SDB. Diabetes mellitus, lower levels of high-density lipoproteins, and smoking tended to have increased prevalence in patients with more severe SDB. The distribution of prevalent cardiovascular diseases (such as myocardial infarction, coronary artery disease, coronary artery bypass graft, stroke, and congestive heart failure) did not vary significantly among patients with and without sleep apnea.Figure 1: Consort patient flow diagram.Download FigureTable 1 baseline characteristics by sleep-disordered breathing severity.Table 1 baseline characteristics by sleep-disordered breathing severity.Table 2 demonstrates that nocturnal cardiac arrhythmia is common in this clinic-based population, affecting 58.5% (n = 86) of patients with mild SDB and 65.6% (n = 256) of patients with moderate-severe SDB, compared to 39.4% (n = 63) of those without SDB. Subjects with moderate-severe SDB had almost 3 times the unadjusted risk of any cardiac arrhythmias (OR 2.94; CI 95%, 2.01–4.30), 2-fold risk of tachyarrhythmias (OR 2.16; CI 95%,1.47–3.18; p = 0.0011), 2 times the risk of complex ventricular ectopy (OR 2.01; CI 95%, 1.36–2.96; p = 0.002), 4 times the risk of combined supraventricular tachycardia (OR 4.21; CI 95%, 1.48–12.00; p = 0.03), and 2 times the risk of intraventricular conduction delay (OR 2.50; CI 95%, 1.58–3.95; p = 0.001). Within these subtypes of arrhythmias, a nonsignificant trend towards a 2- to 3-fold higher prevalence of atrial fibrillation was observed among patients with moderate-severe SDB than those without SDB. The frequency of any cardiac arrhythmias and each individual sub-type of arrhythmia (complex ventricular ectopy, combined supraventricular tachycardia, and intraventricular conduction delay) was greater with increasing SDB severity (p for linear trend, < 0.0001; Figure 2)Table 2 Unadjusted association of sleep-disordered breathing (categorized by severity) with cardiac arrhythmias.Table 2 Unadjusted association of sleep-disordered breathing (categorized by severity) with cardiac arrhythmias.Figure 2: Unadjusted association of sleep-disordered breathing (categorized by severity) with cardiac arrhythmias.*Tachyarrhythmia is defined as ventricular and supraventricular tachycardia. † Complex ventricular ectopy (CVE) is defined as bigeminy or trigeminy or quadrigeminy or nonsustained ventricular tachycardia. ‡ Combined supraventricular tachycardia (CST) is defined as atrial fibrillation or supraventricular tachycardia. ICD, intraventricular conduction delay.Download FigureAs shown in Table 3, after adjusting for several domains of covariates (demographics, cardiovascular risk factors, and cardiovascular disease), patients with moderate-severe SDB had twice the odds of having any cardiac arrhythmias (OR 2.24; CI 95% 1.48–3.40; p = 0.004). The association between moderate-severe SDB category and cardiac arrhythmia persisted for some but not all types of arrhythmia. For example, patients with moderate-severe SDB had twice the odds of intraventricular conduction delay (OR 2.39; CI 95% 1.44- 3.97; p = 0.007). Adjusting for the same covariates, patients with mild SDB had 4 times the odds of having combined supraventricular arrhythmia (OR 4.39; CI 95% 1.19–16.13; p = 0.039), in comparison to those without SDB. There were significant linear trends for the association between sleep-disordered severity and any cardiac arrhythmia as well as with intraventricular conduction delay. (Figure 3)Table 3 Adjusted model of association between SDB and nocturnal cardiac arrhythmias.Table 3 Adjusted model of association between SDB and nocturnal cardiac arrhythmias.Figure 3: Adjusted model of association between SDB and nocturnal cardiac arrhythmias.Adjusted for: age, BMI, gender, cardiovascular (CVD) risk factors (hypertension, smoking status, diabetes, fasting total cholesterol, LDL, and HDL cholesterol), CVD disease (angina, coronary artery disease, myocardial infarction, congestive heart failure, cerebrovascular disease, pacemaker, history of CABG, and PCI). *Tachyarrhythmia is defined as ventricular and supraventricular tachycardia. ICD, intraventricular conduction delay.Download FigureTable 4 describes a secondary analysis examining the association between selected polysomnographic measures of SDB and their association with nocturnal cardiac arrhythmias. SDB as measured by the overall AHI was the strongest predictor of nocturnal cardiac arrhythmias, such that the risk of nocturnal arrhythmias increased by 10% per every 10-unit increase in AHI (OR 1.10; CI 95% 1.04–1.15; p = 0.0005). Obstructive respiratory events were stronger predictors of nocturnal cardiac arrhythmias than were central respiratory events. Finally, various measures of hypoxemia (i.e., ODI, lowest oxygen saturation) were significantly associated with nocturnal cardiac arrhythmias, whereas the measure of arousal from sleep was not.Table 4 Selected polysomnographic measures of SDB and their association with any cardiac arrhythmia.Table 4 Selected polysomnographic measures of SDB and their association with any cardiac arrhythmia.DISCUSSIONUsing laboratory-based, objective measures of SDB, combined with a comprehensive method to ascertain nocturnal cardiac arrhythmias, we observed an independent association between SDB and nocturnal cardiac arrhythmias after adjusting for relevant clinical variables. Increasing severity of SDB, using common clinical cut-points, was associated with an increased risk of all three subtypes of nocturnal cardiac arrhythmias; supraventricular, ventricular, and conduction delay. Obstructive respiratory events were stronger predictors of nocturnal cardiac arrhythmias than were central respiratory events. Various measures of hypoxemia (i.e., ODI, lowest oxygen saturation) were significantly associated with nocturnal cardiac arrhythmia, whereas the arousal index, a measure of arousal from sleep (and presumably sympathetic activity), was not. These associations were found in a sleep clinic-based population of U.S. veterans at risk of having both SDB and cardiac arrhythmias.Our results are consistent with the small number of previous studies in this domain that have demonstrated a strong and independent association between SDB and nocturnal cardiac arrhythmias.9,16,17 In addition, our study adds to the current understanding of SDB and arrhythmias in several important ways. First, we targeted a clinic-based population, which is likely more representative of patients referred for sleep testing. Second, we accounted for numerous cardiovascular risk factors, as well as established cardiovascular disease. Third, we observed a strong dose-response relationship between increasing severity of SDB, using accepted clinical cut-points and the three main subtypes of nocturnal cardiac arrhythmia: supraventricular, ventricular, and conduction delay. Finally, we observed that obstructive respiratory events, rather than central respiratory events, and measures of hypoxia, rather than arousal, were stronger predictors of nocturnal arrhythmia risk.Limited research has characterized the association between SDB and nocturnal cardiac arrhythmias. One of the first studies to examine the SDB-arrhythmia relationship reported that 193 of 400 patients with severe OSA demonstrated cardiac arrhythmias (non-sustained ventricular tachycardia, sinus arrest, and second-degree atrioventricular conduction block) after evaluation by PSG and 24-h Holter monitoring. In that study, only patients with severe OSA were included; no reference group was used, and analyses did not adjust for potential confounders.16 Comparing patients with severe SDB to those with no SDB, a previous analysis from the Sleep Heart Health Study (SHHS) demonstrated an association between severe SDB and prevalent nocturnal cardiac arrhythmias.17 A subsequent study, by the same investigators, using data from the Outcomes of Sleep Disorders in Older Men (MrOS Sleep), focused specifically on atrial fibrillation and complex ventricular ectopy. The results suggested that central respiratory events had more significant association with atrial fibrillation, whereas obstructive respiratory events had a stronger linkage with ventricular arrhythmias.9 As these were population-based studies, they tended to include participants with less severe SDB and fewer cardiovascular comorbidities. Our results in large part are consistent with these previous findings, but show association between OSA and arrhythmia in a U.S. veteran population with high cardiovascular comorbidity rates.Hypoxia has a complex association with cardiac arrhythmias. Chronic intermittent hypoxia may be cardio-protective and associated with “preconditioning,” while acute intermittent hypoxia could be pro-arrhythmogenic by inducing release of reactive oxygen species (ROS) and by increasing sympathetic nerve activity.18–23 In line with these mechanisms, our findings suggest that hypoxia frequency (ODI 4%) was associated with increased nocturnal arrhythmias. Mechanistically, intermittent hypoxia in OSA patients may directly cause ventricular ectopy by inducing the release of ROS, which pathologically stimulate cardiac ion channels and predispose to arrhythmia.24There are other potential mechanisms why arrhythmia may arise in the presence of OSA. During an obstructive apnea, inspiratory effort against a collapsed upper airway generates negative intrathoracic force on the order of −60 mm Hg,25,26 stimulating cardiac mechanoreceptors and increasing cardiac transmural pressure, thereby predisposing to arrhythmia.27–29 Negative intrathoracic pressure has been shown to increase supraventricular premature beats and also to prolong the QTc interval, which in turn may explain the increased risk of dysrhythmias and sudden cardiac death.30–32At the same time, the frequent co-stimulation of sympathetic and parasympathetic systems during sleep-disordered breathing may predispose to atrial arrhythmia.33 Atrial fibrillation (AF), in particular, has been associated with OSA.34 Experimental manipulations of the autonomic nervous system perturb the electrical system of the atrium, shortening the effective refractory period, increasing heterogeneity of conduction and repolarization, facilitating atrial fibrillation.33,35 Ambulatory monitoring studies analyzing heart rate variability have also shown a primary adrenergic increase followed by a vagal response may precede atrial arrhythmia supporting this concept.36Despite the well documented association of AF with SDB, our study showed a non-significant trend towards a 2- to 3-fold higher prevalence of AF among patients with moderate-severe SDB in comparison to those without SDB. This finding could be explained by the small representation of patients with predominant central sleep apnea (CAI > 50% of total AHI) in our SDB group (16 of 537 patients), and the finding in previous studies that prevalent AF is more highly associated with central rather than obstructive sleep apnea.9Regarding conduction delay arrhythmias, the prevalence of sinus pauses, atrioventricular block, and asystole has been reported in up to 18% in patients with SDB, in comparison to just 3% among a healthy population.16 In OSA patients, the occurrence of conduction delay arrhythmias has been associated with OSA severity, the extent of hypoxemia, and REM sleep.37,38 Our study found a significant relationship of hypoxemia with frequency of intraventricular conduction delay. Other studies have yielded different results. Mehra et al. reported no significant difference in conduction delay arrhythmia between individuals with SDB and those without.17,39 This difference in observational data may be explained by difference in study design and study population, as well as degree of oxygen desaturation. Mechanistically, the combination of an apneic event and hypoxemia are necessary to trigger a vagally mediated apneic arrhythmia.37,38,40Our study has several strengths, including: (1) a detailed individually scored full in-laboratory polysomnography with coding and abstraction of various measures of hypoxia, arousals, and sleep architecture; (2) a rigorous, standardized collection of demographic information, cardiovascular risk factors, and established cardiovascular disease, with l" @default.
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