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Concept: Sleep apnea


Background:Short sleep and weight gain are inversely related. Sleep deprivation acutely increases food intake but little is known about eating behavior in chronically sleep-deprived, obese individuals.Objective:To characterize the relationship between sleep, food intake and alcohol consumption under free-living conditions in obese, chronically sleep-deprived individuals.Design:Cross-sectional study of a cohort of obese men and premenopausal women.Subjects:A total of 118 obese subjects (age: 40.3±6.7 years; 91 females/27 males; body mass index 38.7±6.4 kg m(-2)).Measurements:Energy, macronutrient, alcohol and caffeine intake assessed by 3-day food records. Sleep duration estimated by actigraphy. Respiratory disturbance index assessed by a portable device.Results:Subjects slept 360.7±50.2 min per night and had a total energy intake of 2279.1±689 kcal per day. Sleep duration and energy intake were inversely related (r=-0.230, P=0.015). By extrapolation, each 30-min deficit per day in sleep duration would translate to an ∼83 kcal per day increase in energy intake. In addition, sleep apnea was associated with a shift from carbohydrate to fat intake. Alcohol intake in subjects consuming >3.5 g of alcohol per day (N=41) was inversely related to sleep duration (r=-0.472, P=0.002).Conclusions:Shorter sleep duration and obstructive sleep apnea are associated with higher energy, fat and alcohol intakes in obese individuals. The importance of this study relies on the population studied, obese subjects with chronic sleep deprivation. These novel findings apply to the large segment of the US population who are obese and sleep-deprived.

Concepts: Nutrition, Obesity, Mass, Sleep, Sleep deprivation, Body mass index, Sleep apnea, Obstructive sleep apnea


A 61-year-old man was referred to our hospital for evaluation of sleep apnea. He snored loudly and had apnea during sleep. During the day, he was sleepy, and when lying down, he could quickly fall asleep. He had a score of 15 on the Epworth Sleepiness Scale, which ranges from 0 to 24, with a score of more than 10 suggestive of excessive daytime somnolence. On physical examination, there were no abnormalities other than obesity (100 kg [220 lb]; body-mass index [the weight in kilograms divided by the square of the height in meters], 31). Overnight polygraphy revealed a score . . .

Concepts: Mass, Sleep, Sleep disorder, Sleep apnea, Sleep medicine, Epworth Sleepiness Scale, Somnolence, Kilogram


Obstructive sleep apnea (OSA) has been reported to be a risk factor for cardiovascular (CV) disease. Although the apnea-hypopnea index (AHI) is the most commonly used measure of OSA, other less well studied OSA-related variables may be more pathophysiologically relevant and offer better prediction. The objective of this study was to evaluate the relationship between OSA-related variables and risk of CV events.

Concepts: Epidemiology, Actuarial science, Sleep apnea, Obstructive sleep apnea, Cultural studies, Hypopnea, Abnormal respiration, Medical conditions related to obesity


Background Obstructive sleep apnea is associated with an increased risk of cardiovascular events; whether treatment with continuous positive airway pressure (CPAP) prevents major cardiovascular events is uncertain. Methods After a 1-week run-in period during which the participants used sham CPAP, we randomly assigned 2717 eligible adults between 45 and 75 years of age who had moderate-to-severe obstructive sleep apnea and coronary or cerebrovascular disease to receive CPAP treatment plus usual care (CPAP group) or usual care alone (usual-care group). The primary composite end point was death from cardiovascular causes, myocardial infarction, stroke, or hospitalization for unstable angina, heart failure, or transient ischemic attack. Secondary end points included other cardiovascular outcomes, health-related quality of life, snoring symptoms, daytime sleepiness, and mood. Results Most of the participants were men who had moderate-to-severe obstructive sleep apnea and minimal sleepiness. In the CPAP group, the mean duration of adherence to CPAP therapy was 3.3 hours per night, and the mean apnea-hypopnea index (the number of apnea or hypopnea events per hour of recording) decreased from 29.0 events per hour at baseline to 3.7 events per hour during follow-up. After a mean follow-up of 3.7 years, a primary end-point event had occurred in 229 participants in the CPAP group (17.0%) and in 207 participants in the usual-care group (15.4%) (hazard ratio with CPAP, 1.10; 95% confidence interval, 0.91 to 1.32; P=0.34). No significant effect on any individual or other composite cardiovascular end point was observed. CPAP significantly reduced snoring and daytime sleepiness and improved health-related quality of life and mood. Conclusions Therapy with CPAP plus usual care, as compared with usual care alone, did not prevent cardiovascular events in patients with moderate-to-severe obstructive sleep apnea and established cardiovascular disease. (Funded by the National Health and Medical Research Council of Australia and others; SAVE number, NCT00738179 ; Australian New Zealand Clinical Trials Registry number, ACTRN12608000409370 .).

Concepts: Myocardial infarction, Atherosclerosis, Angina pectoris, Cardiovascular disease, Sleep, Sleep apnea, Obstructive sleep apnea, Cardiovascular diseases


OBJECTIVE We tested the hypothesis of an independent cross-sectional association between obstructive sleep apnea (OSA) severity and glycated hemoglobin (HbA(1c)) in adults without known diabetes. RESEARCH DESIGN AND METHODS HbA(1c) was measured in whole-blood samples from 2,139 patients undergoing nocturnal recording for suspected OSA. Participants with self-reported diabetes, use of diabetes medication, or HbA(1c) value ≥6.5% were excluded from this study. Our final sample size comprised 1,599 patients. RESULTS A dose-response relationship was observed between apnea-hypopnea index (AHI) and the percentage of patients with HbA(1c) >6.0%, ranging from 10.8% for AHI <5 to 34.2% for AHI ≥50. After adjustment for age, sex, smoking habits, BMI, waist circumference, cardiovascular morbidity, daytime sleepiness, depression, insomnia, sleep duration, and study site, odds ratios (95% CIs) for HbA(1c) >6.0% were 1 (reference), 1.40 (0.84-2.32), 1.80 (1.19-2.72), 2.02 (1.31-3.14), and 2.96 (1.58-5.54) for AHI values <5, 5 to <15, 15 to <30, 30 to <50, and ≥50, respectively. Increasing hypoxemia during sleep was also independently associated with the odds of HbA(1c) >6.0%. CONCLUSIONS Among adults without known diabetes, increasing OSA severity is independently associated with impaired glucose metabolism, as assessed by higher HbA(1c) values, which may expose them to higher risks of diabetes and cardiovascular disease.

Concepts: Diabetes mellitus, Blood sugar, Sleep, Sleep apnea, Obstructive sleep apnea, Glycated hemoglobin, Hypopnea, Medical conditions related to obesity


PURPOSE: To directly compare the clinical effectiveness of maxillomandibular advancement (MMA) and uvulopalatopharyngoplasty (UPPP)-performed alone and in combination-for the treatment of moderate to severe obstructive sleep apnea (OSA). PATIENTS AND METHODS: The investigators designed and implemented a retrospective cohort study composed of patients with moderate to severe OSA (baseline AHI >15). The predictor variable was operative treatment and included MMA, UPPP, and MMA followed by UPPP (UPPP/MMA). The primary outcome variable was the apnea-hypopnea index (AHI) measured preoperatively and 3 months to 6 months postoperatively. Other variables were grouped into the following categories: demographic, respiratory, and sleep parameters. Descriptive and bivariate statistics were computed. RESULTS: The sample was composed of 106 patients grouped as follows: MMA (n = 37), UPPP (n = 34), and UPPP/MMA (n = 35) for treatment of OSA. There were no significant differences between the 3 groups for the study variables at baseline, except for AHI. Surgical treatment resulted in a significant decrease in AHI in each group: MMA (baseline AHI, 56.3 ± 22.6 vs AHI after MMA, 11.4 ± 9.8; P < .0001), UPPP/MMA (baseline AHI, 55.7 ± 49.2 vs AHI after UPPP/MMA, 11.6 ± 10.7; P < .0001), and UPPP (baseline AHI, 41.8 ± 28.0 vs AHI after UPPP, 30.1 ± 27.5; P = .0057). After adjusting for differences in baseline AHI, the estimated mean change in AHI was significantly larger for MMA compared with UPPP (MMA AHI, -40.5 vs UPPP AHI, -19.4; P = < .0001). UPPP/MMA was no more effective than MMA (P = .684). CONCLUSION: The results of this study suggest that MMA should be the surgical treatment option of choice for most patients with moderate to severe OSA who are unable to adequately adhere to CPAP.

Concepts: Cohort study, Clinical trial, Sleep apnea, Obstructive sleep apnea, Hypopnea, Uvulopalatopharyngoplasty


BACKGROUND: The recent SLEEMSA study that evaluated excessive daytime sleepiness (EDS) in Caucasian patients with multiple system atrophy (MSA) demonstrated that EDS was more frequent in patients (28%) than in healthy subjects (2%). However, the prevalence and determinants of EDS in other ethnic populations have not been reported to date. METHODS: We performed a single-hospital prospective study on patients with probable MSA. To ascertain the prevalence and determinants of EDS in Japanese MSA patients, we assessed the patients' degree of daytime sleepiness by using the Japanese version of the Epworth Sleepiness Scale (ESS). In addition, we investigated the effects of sleep-disordered breathing (SDB) and abnormal periodic leg movements in sleep (PLMS), which were measured by polysomnography, on the patients' ESS scores. RESULTS: A total of 25 patients with probable MSA (21 patients with cerebellar MSA and 4 patients with parkinsonian MSA) were included in this study. All patients underwent standard polysomnography. The mean ESS score was 6.2 +/- 0.9, and EDS was identified in 24% of the patients. SDB and abnormal PLMS were identified in 24 (96%) and 11 (44%) patients, respectively. The prevalences of EDS in patients with SDB and abnormal PLMS were 25% and 18%, respectively. No correlations were observed between ESS scores and the parameters of SDB or abnormal PLMS. CONCLUSIONS: The frequency of EDS in Japanese patients with MSA was similar to that in Caucasian MSA patients. SDB and abnormal PLMS were frequently observed in MSA patients, although the severities of these factors were not correlated with EDS. Further investigations using objective sleep tests need to be performed.

Concepts: Sleep, Sleep disorder, Parkinson's disease, Sleep apnea, Sleep medicine, Epworth Sleepiness Scale, Excessive daytime sleepiness, Sleep disorders


OBJETIVE: To evaluate the effectiveness of adenotonsillectomy for the treatment of obstructive sleep apnea hypopnea syndrome (OSAHS) in children by respiratory polygraphy (RP). MATERIAL AND METHODS: Prospective study was conducted on children referred with clinical suspicion of OSAHS. A clinical history was taken and a general physical and ENT examination was performed on all patients. RP was performed before adenotonsillectomy and six months afterwards. Patients with craniofacial syndromes, neuromuscular disorders, and severe concomitant disease were excluded. RESULTS: We studied 150 children (67. 8% male), with a mean age of 3.74±1.80 years and a BMI of 41.70±31.75. A diagnosis of OSAHS was made if the total number of respiratory events, apneas and hypopneas, divided by the total study time (RDI) was > 4.6, using RP before undergoing adenotonsillectomy. The mean respiratory disturbance index (RDI) was 15.18±11.11, with 58.7% (88) of with severe OSAHS (RDI>10). There was a significant improvement in all clinical and polygraphic variables six months after adenotonsillectomy. The residual OSAHS was 14%. The preoperative RDI was significantly associated with persistent disease (P=.042). CONCLUSIONS: Respiratory polygraphy is useful for monitoring the efficacy of surgical treatment by adenotonsillectomy in children with OSAHS.

Concepts: Pulmonology, Sleep disorder, Sleep apnea, Obstructive sleep apnea, Hypopnea, Abnormal respiration, Apnea, Sleep disorders


The exact underlying pathomechanism of central sleep apnea with Cheyne-Stokes respiration (CSA-CSR) is still unclear. Recent studies have demonstrated an association between cerebral white matter changes and CSA. A dysfunction of central respiratory control centers in the brainstem was suggested by some authors. Novel MR-imaging analysis tools now allow far more subtle assessment of microstructural cerebral changes. The aim of this study was to investigate whether and what severity of subtle structural cerebral changes could lead to CSA-CSR, and whether there is a specific pattern of neurodegenerative changes that cause CSR. Therefore, we examined patients with Fabry disease (FD), an inherited, lysosomal storage disease. White matter lesions are early and frequent findings in FD. Thus, FD can serve as a “model disease” of cerebral microangiopathy to study in more detail the impact of cerebral lesions on central sleep apnea.

Concepts: Respiratory physiology, Lysosomal storage disease, Sleep, White matter, Sleep apnea, Abnormal respiration, Apnea, Respiration


macronutrient intake has been found to affect sleep parameters including obstructive sleep apnoea (OSA) in experimental studies, but there is uncertainty at the population level in adults.

Concepts: Sleep, Sleep apnea, Obstructive sleep apnea, Hypopnea, Abnormal respiration, Sudden infant death syndrome