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Prevalence and Severity of Sleep Apnea in a Group of Morbidly Obese Patients
Authors:Carla Daltro  Paloma Baiardi Gregorio  Erivaldo Alves  Maurício Abreu  Daniel Bomfim  Maria Helena Chicourel  Leila Araújo  Helma P. Cotrim
Affiliation:(1) Professor, Bahiana School of Medicine and Public Health, Department of Internal Medicine, Bahia, Brazil;(2) Doctor of Cardio Pulmonary Sleep Laboratory, Bahia, Brazil;(3) Surgeon of Obesity Treatment and Surgery Center, Bahia, Brazil;(4) Medical Student at Bahiana School of Medicine and Public Health, Bahia, Brazil;(5) Professor, Bahia, Federal University of Medicine, Department of Internal Medicine, Bahia, Brazil;(6) Rua Clarival do Prado Valladares, 264/803, Salvador, Bahia, Brazil, CEP: 41.820-700
Abstract:Background Obesity is the most important risk factor for obstructive sleep apnea. It is estimated that 70% of sleep apnea patients are obese. In the morbidly obese, the prevalence may reach 80% in men and 50% in women. The aim of this study was to determine the prevalence and severity of sleep apnea in a group of morbidly obese patients, leading to bariatric surgery. Methods In a cross-sectional study developed in Bahia, northeastern Brazil. 108 patients (78 women and 30 men) from the Obesity Treatment and Surgery Center - “Núcleo de Tratamento e Cirurgia da Obesidade” underwent standard polysomnography. Patients with an apnea-hypopnea index (AHI) ≥ 5 events/hour were considered apneic. Results Mean ± SD for age and BMI were 37.1 ± 10.2 years and 45.2 ± 5.4 kg/m2, respectively. The calculated AHI ranged widely from 2.5 to 128.9 events/hour. Sleep apnea was detected in 93.6% of the sample, wherein 35.2% had mild, 30.6% moderate and 27.8% severe apnea. Oxyhemoglobin desaturation was directly related to the AHI and was more severe in men. Conclusion There was a high frequency of sleep apnea in this group of morbidly obese patients, for whom it was very important to request polysomnography, thus enabling therapeutic management and prognostication.
Keywords:Oxyhemoglobin desaturation  morbid obesity  obesity surgery  polysomnography  apnea-hypopnea index
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