阻塞性睡眠呼吸暂停综合征与心律失常

阻塞性睡眠呼吸暂停综合征（ＯＳＡＳ）对心血管功能的影响越来越引起人们的关注。为探讨ＯＳＡＳ与心律失常的关系，我们对２１２例打鼾者行夜间多导睡眠图监测（ＰＳＧ），呼吸紊乱指数（ＡＨＩ）≥５为ＯＳＡＳ。分析ＰＳＧ心电导联。结果：１４６例病人诊断为ＯＳＡＳ，其中８２例ＯＳＡＳ病人发生心律失常（５６．２％），包括早搏或心动过速、传导阻滞或二者均有。采用经鼻持续气道内正压呼吸（ｎＣ－ＰＡＰ）７小时治疗严重的ＯＳＡＳ合并心律失常１９例，其中治疗后心律失常完全消失者１４例（７３．７％）。ＯＳＡＳ病人的心律失常发生率较非ＯＳＡＳ高（χ２＝１７．２８，Ｐ＜０．０００１）。心律失常发生率与低氧及夜间呼吸暂停严重程度呈正相关。ｎＣＰＡＰ有效治疗呼吸暂停的同时可逆转或改善心律失常。作者认为，低氧血症很可能是ＯＳＡＳ者心律失常的重要原因之一。     

Obstructive sleep apnea,verbal memory,and executive function in a community-based high-risk population identified by the Berlin Questionnaire Akershus Sleep Apnea Project

Purpose  

Cognitive functions in community-dwelling adults at high risk of obstructive sleep apnea have not been described and nor are associations between cognitive functions and obstructive sleep apnea severity fully understood. The study aimed to describe verbal memory and executive function in community-dwelling adults identified by the Berlin Questionnaire and to investigate associations between these cognitive domains and different obstructive sleep apnea severity indicators.     

Cardiac troponin T in obstructive sleep apnea

STUDY OBJECTIVES: Obstructive sleep apnea (OSA) is associated with nocturnal angina and ST-segment depression, which are relieved by treatment with continuous positive airway pressure (CPAP). We tested the hypothesis that severe nocturnal hypoxia in patients with OSA causes myocyte necrosis as evidenced by increases in cardiac troponin T. DESIGN: Prospective cohort study. SETTING: Cardiovascular physiology and sleep research laboratory. PARTICIPANTS: Fifteen male volunteers with coronary artery disease (CAD) and moderate or severe OSA (apnea-hypopnea index [AHI] > 15). MEASUREMENTS AND RESULTS: Polysomnography and measurement of serum cardiac troponin T before sleep, after 4 h of untreated OSA, and in the morning after 4 h of treatment with CPAP. The mean AHI for the group was 41 (SD 16), and the mean oxygen saturation nadir during sleep was 83% (SD 8%). All measurements of cardiac troponin T were < 0.010 ng/mL. CONCLUSIONS: Despite the fact that some patients with OSA may experience nocturnal ischemia, this study shows that patients with severe OSA and coexisting CAD do not have nightly episodes of myocardial injury detectable by the current-generation cardiac troponin T assay.     

Apnea duration and hypoxemia during REM sleep in patients with obstructive sleep apnea

Nocturnal sleep studies of 12 patients with obstructive sleep apnea and a matched control group of 12 subjects without the sleep apnea syndrome were analyzed to compare arterial oxyhemoglobin saturation (SaO2) during REM and non-REM sleep. Mean percentage of total sleep time spent in REM sleep was not significantly different in patients with obstructive sleep apnea and in subjects without significant apnea (14.2 +/- SEM 2.2 percent in patients vs 12.0 +/- 2.2 percent in nonapnea subjects). Apneas were longer during REM than non-REM sleep in all 12 patients (p less than 0.01). Oxyhemoglobin desaturations were more frequent during REM than non-REM sleep in both apnea patients and the control subjects. In addition, there was a greater mean fall in SaO2 per desaturation episode in both the apnea patients and non-apnea subjects. We conclude: 1) sleep apneas are longer during REM sleep than non-REM sleep in patients with obstructive sleep apnea; 2) hypoxemia is greater during REM sleep than non-REM sleep in subjects with and without the sleep apnea syndrome.     

Translation,cultural adaptation,and validation of the Sleep Apnea Quality of Life Index (SAQLI) in Persian-speaking patients with obstructive sleep apnea

Purpose

The aim of this study was the translation, cross-cultural adaptation, and validation of the Sleep Apnea Quality of Life Index (SAQLI) in Persian-speaking patients with obstructive sleep apnea (OSA).

Methods

Ninety-six patients with OSA completed a series of questionnaires including SAQLI, Epworth Sleepiness Scale (ESS),10-item Functional Outcomes of Sleep Questionnaire (FOSQ-10), and Medical Outcome Survey Short form 12 (SF-12) for assessment of reliability, validity, and responsiveness of Persian version of SAQLI.

Results

The Persian version of SAQLI had a very good internal consistency and also demonstrated good test-retest reliability. Concurrent validity was confirmed by significant correlations with ESS, FOSQ-10 and SF-12 subscale scores. Comparison of SAQLI scores in groups of patients categorized by ESS showed the high discriminative power of this instrument. However, there was no significant difference in the SAQLI scores of patients with mild, moderate, and severe sleep apnea. The results of sensitivity to change verified that the SAQLI was able to detect changes after continuous positive airway pressure (CPAP) treatment.

Conclusion

The findings of this study indicate that the Persian version of SAQLI is a reliable, valid, and responsive measure for evaluation of quality of life in patients with OSA.

     

Sleep quality and blood pressure dipping in obstructive sleep apnea

Background:Obstructive sleep apnea (OSA) is associated with poor sleep quality and a high incidence of nondipping. The aim of this study was to determine the association of sleep quality and nocturnal blood pressure (BP) dipping in an OSA population.Methods:A total of 44 untreated subjects with mild to severe OSA underwent overnight-attended polysomnography and 24-h ambulatory BP monitoring. Subjects were off antihypertensive medication. The percentage of slow wave sleep, percentage of time awake after sleep onset during the sleep period, sleep efficiency, and arousal index were chosen as measurements of sleep quality. Dipping was evaluated using the change in systolic BP, diastolic BP, and mean arterial pressure. Patients were classified as dippers and nondippers based on a nocturnal drop in mean arterial pressure > 10%. Differences between groups were evaluated by independent sample t tests. Pearson correlation and linear regression were used to evaluate the association of sleep quality and dipping.Results:There were no differences between dippers and nondippers with regard to body mass index, age, or respiratory disturbance index. A total of 84% were nondippers. No difference was found between dippers and nondippers in sleep quality. None of the sleep quality measures correlated with the measurements of dipping. In multiple regression analyses, the percentage of slow wave sleep and arousal index each independently predicted only a small percentage of the variance (approximately 10%) of nocturnal DBP dipping.Conclusions:The prevalence of nondipping was very high in a population of untreated patients with mild to severe OSA. Nonetheless, sleep quality did not appear to be related to BP dipping.     

Sleep characteristics following adenotonsillectomy in children with obstructive sleep apnea syndrome

OBJECTIVE: To compare the effect of adenotonsillectomy on rapid eye movement (REM)- and non-REM-related respiratory and sleep architecture characteristics in children with obstructive sleep apnea syndrome (OSAS). STUDY DESIGN: This prospective study evaluated 36 children (median age, 6.9 years; range, 1.8 to 12.6 years) with OSAS using polysomnography before and a few months after adenotonsillectomy. Primary outcomes included the number of obstructive apnea and hypopnea and arousals per hour of sleep. RESULTS: At 4.6 months (range, 1 to 16 months) after adenotonsillectomy, there was a significant improvement of all respiratory parameters. The median respiratory disturbance index (RDI) decreased from 4.1/h (range, 0 to 85/h) to 0.9/h (range, 0 to 13/h) after adenotonsillectomy (p < 0.0001). The median non-REM RDI decreased from 3.0/h (range, 0 to 89/h) to 0.4/h (range, 0 to 13/h) [p < 0.001] as compared with REM RDI, which decreased from 7.8/h (range, 0 to 69/h) to 2.3/h (range, 0 to 54/h) after adenotonsillectomy (p < 0.01). Median arousal index decreased following adenotonsillectomy from 17.5/h (range, 7 to 57/h) to 14.0/h (range, 6 to 47/h) [p < 0.03]. CONCLUSIONS: Adenotonsillectomy resulted in a greater improvement in non-REM RDI as compared with REM-RDI, and a decrease in the number of arousals.     

阻塞性与中枢性睡眠呼吸暂停事件的鉴别

睡眠呼吸暂停是一种有严重危害的常见病,可导致白天嗜睡、患者生活质量下降等,是心脑血管病变的独立危险因素.合理治疗这一疾病对于减少交通事故的发生,降低心脑血管疾病的发病率及病死率均有重大意义.睡眠呼吸暂停可分为阻塞性睡眠呼吸暂停(OSA)和中枢性睡眠呼吸暂停(CSA).由于二者病因及发病机制不同,治疗方法也有很大差异,正确区分OSA与CSA具有重要临床价值.     

Cardiac arrhythmias and conduction disturbances in the sleep apnea syndrome: Prevalence and significance

The results of 24-hour continuous electrocardiographic monitoring of 23 patients with documented sleep apnea syndrome were reviewed to evaluate the prevalence of cardiac arrhythmias and conduction disturbances in this disorder. During sleep, marked sinus arrhythmia (more than 30 beats/min variation) was found in 18 patients. Extreme sinus bradycardia (heart rate less than 30 beats/min) and sinus pauses (more than 1.8 sec) were found in only two patients. First-degree and type I second-degree atrioventricular block were found in another patient. There was a decrease in grade of ventricular ectopy from wakefulness to sleep. These data suggest that the prevalence of serious arrhythmias and conduction disturbances during sleep in patients with the sleep apnea syndrome is much lower than previously reported.     

Efficacy of continuous positive airway pressure on arrhythmias in obstructive sleep apnea patients

The purpose of this study was to determine the relationship between obstructive sleep apnea (OSA) and cardiovascular disorders in a large Japanese population, and to assess the efficacy of continuous positive airway pressure (CPAP) in the treatment of OSA-associated arrhythmias. The study population comprised 1394 Japanese subjects (1086 men and 308 women) who were divided into four groups on the basis of polysomnography (PSG) analysis as follows: the no sleep apnea (N-SA) group (n = 44, apnea-hypopnea index [AHI] < 5), the mild OSA (Mi-OSA) group (n = 197, 5 < AHI < 15), the moderate OSA (Mo) group (n = 368, 15 < AHI < 30), and severe OSA (SOSA) group (n = 785, AHI < 30). The following baseline characteristics were significantly associated with OSA: age (P < 0.001), gender (P < 0.001), body mass index (P < 0.001), hypertension (P < 0.001), diabetes (P = 0.009), and hyperlipidemia (P = 0.013). In the OSA group, PSG revealed the predominance of paroxysmal atrial fibrillation (PAF) (P = 0.051), premature atrial complex short run (P < 0.005), premature ventricular complex (PVC, P = 0.004), sinus bradycardia (P = 0.036), and sinus pause (arrest >2 s, P < 0.001) during the PSG recording. A total of 316 patients from the group underwent CPAP titration and were then re-evaluated. Continuous positive airway pressure therapy significantly reduced the occurrences of PAF (P < 0.001), PVC (P = 0.016), sinus bradycardia (P = 0.001), and sinus pause (P = 0.004). The results of this study demonstrate a significant relationship between OSA and several cardiac disorders, and also demonstrate the efficacy of CPAP in preventing OSA-associated arrhythmias in a large population of Japanese patients.     

Sleep and breathing on the first night after adenotonsillectomy for obstructive sleep apnea

Adenotonsillectomy (T&A) has established effectiveness for the treatment of obstructive sleep apnea (OSA). However, more than 20% of children with OSA have respiratory compromise requiring medical intervention in the postoperative period. The reasons for this complication are not well-defined. We aimed to compare the nature and severity of sleep-disordered breathing in children with mild and severe OSA on the first night following adenotonsillectomy. Ten children were classified into groups of mild and severe OSA, based on preoperative testing. On the first night after T&A, they underwent polysomnography, including electroencephalograph, submental electromyography, bilateral electro-oculograms, monitoring of respiratory movements, heart rate, ECG, and oxygen saturation. Sleep-disordered breathing was assessed by the apnea-hypopnea index, the SaO(2) nadir, and the desaturation index, including dips in saturation below 90% (DI(90)). Sleep quality was assessed by sleep efficiency, time spent in each sleep state, and respiratory arousal index. Obstructive events occurred postoperatively in all children, but were more frequent in those with severe OSA preoperatively: the median (interquartile range) mixed/obstructive apnea/hypopnea indicies were 6.9 (2.2-9.8) events/hr and 21.5 (15.1-112.1) events/hr for the mild OSA group and the severe OSA group, respectively (P = 0.009). Obstructive events were the major cause of desaturation during sleep postoperatively. Sleep quality was severely disrupted in both groups, with reductions in both slow-wave sleep and rapid eye movement sleep. In conclusion, despite removal of obstructing lymphoid tissue, upper airway obstruction occurred on the first postoperative night in children with OSA. This study is the first to demonstrate the mechanism of respiratory compromise after adenotonsillectomy, a common postoperative complication in children with severe OSA.     

Coagulability in obstructive sleep apnea

BACKGROUND:

Obstructive sleep apnea (OSA) is a common disorder that affects both quality of life and cardiovascular health. The causal link between OSA and cardiovascular morbidity/mortality remains elusive. One possible explanation is that repeated episodes of nocturnal hypoxia lead to a hypercoagulable state that predisposes patients to thrombotic events. There is evidence supporting a wide array of hematological changes that affect hemostasis (eg, increased hematocrit, blood viscosity, platelet activation, clotting factors and decreased fibrinolytic activity).

OBJECTIVE:

To provide a comprehensive review of the current evidence associating OSA with increased coagulability, and to highlight areas for future research.

METHODS:

Keyword searches in Ovid Medline were used to identify relevant articles; all references in the articles were searched for relevant titles. The Web of Science was used to identify articles citing the relevant articles found using the Ovid Medline search. All original peer-reviewed articles, meta-analyses and systematic reviews regarding the pertinent topics between 1990 and present were selected for review.

RESULTS:

Hematocrit, blood viscosity, certain clotting factors, tissue factor, platelet activity and whole blood coagulability are increased in patients with OSA, while fibrinolysis is impaired.

CONCLUSION:

There is considerable evidence that OSA is associated with a procoagulant state. Several factors are involved in the procoagulant state associated with OSA. There is a need for adequately powered clinical studies involving well-matched control groups to address potential confounding variables, and to accurately delineate the individual factors involved in the procoagulant state associated with OSA and their response to treatment.     

微动敏感床垫式睡眠监测系统(RS611)对阻塞性睡眠呼吸暂停低通气综合征的诊断价值

目的评价微动敏感床垫式睡眠监测系统(RS611)对阻塞性睡眠呼吸暂停低通气综合征(OSAHS)的诊断价值。方法 38例OSAHS患者行整夜多导睡眠呼吸监测和微动敏感床垫式睡眠监测系统(RS611)监测。多导睡眠呼吸监测根据标准规则判断睡眠呼吸事件;微动敏感床垫式系统(RS611),根据计算机设计程序自动运算,分析所采集分离出的心动波、呼吸节律、腿动及胸动冲击,计算出呼吸事件频率,睡眠结构和各种睡眠参数,得出睡眠呼吸暂停指数(SRM AHI)。将两种检查所得AHI指数进行统计学分析,比较其相关性、一致性及诊断价值检验。对两个睡眠结构图逐屏进行分析,比较两种检查的觉醒、睡眠一致性;觉醒、NREMS期睡眠、REM期睡眠的一致性。结果平均年龄(46.16±12.29)岁,身体质量指数(28.41±4.57)kg/m2,平均PSG AHI(32.29±20.41)h,平均RS611 AHI(39.23±23.52)h,PSG AHI和RS611 AHI指数间显著相关(r=0.83,P0.001),为评估PAT检测的敏感性和特异性,构建ROC曲线,以AHI的不同阈值(5,15,30),在不同阈值时最佳敏感度和特异度分别是100/75,100/77.8,77.8/100。两种睡眠结构比较,醒-睡一致性为91%,觉醒、NREMS、REMS期睡眠的一致性为68%。结论微动敏感床垫式睡眠监测系统(RS611)是一种精确检测OSAHS的装置,监测简便而准确。     

阻塞性睡眠呼吸暂停促进高血压发生的机制

阻塞性睡眠呼吸暂停(OSA)与高血压的发生有重要关系.OSA促进高血压的发生可以从神经机制、氧化应激和炎症反应、血管内皮功能损伤、胰岛素抵抗等方面解释.合理采用有效措施干预OSA具有重要意义.     

Inflammation accelerates atherosclerotic processes in obstructive sleep apnea syndrome (OSAS)

Obstructive sleep apnea syndrome (OSAS) is an often underestimated sleep disorder that has been associated with cardiovascular disease. OSAS is characterized by cycles of apnea and/or hypopnea during sleep caused by the collapse of the upper airways. Intermittent hypoxia deriving from the cycles of apnea/arousals (to retrieve the ventilation) plays a pivotal role in the pathogenesis of the disease. Obesity is the most frequent predisposing condition of OSAS. Recent evidence suggests that OSAS could be considered as a pro-atherosclerotic disease, independently of visceral fat amount. Oxidative stress, cardiovascular inflammation, endothelial dysfunction, and metabolic abnormalities in OSAS could accelerate atherogenesis. The present review is focused on the possible pathophysiological mediators which could favor atherosclerosis in OSAS.