Twenty-four hour Blood Pressure in Obese Patients with Moderate-to-Severe Obstructive Sleep Apnea

Background: Obesity, systemic arterial hypertension (SAH) and obstructive sleep apnea (OSA) are closely related. Up to 70% of patients with OSA may be asymptomatic, and there is evidence that these patients have cardiovascular disease, especially nocturnal SAH. Objectives: The aim of this study was to evaluate 24-hour blood pressure circadian variation in asymptomatic, obese individuals with moderate-to-severe OSA and compare it with that in individuals with mild OSA or without OSA. Methods: Eighty-six obese subjects aged between 30 and 55 years (BMI 30-39 kg/m(2)), with casual blood pressure < 140/90 mrnHg and without comorbidities were recruited. Eighty-one patients underwent clinical and anthropometric assessment, ambulatory blood pressure monitoring (ABPM), and Watch-PAT. Participants were divided into two groups, based on the apnea-hypopnea index (AHI): group 1, with AHI < 15 events/hour, and group 2 with AHI >= 15 events/hour. Results: Compared with group 1, group 2 had higher neck circumference and waist-hip circumference (40.5 +/- 3.2 cm vs. 38.0 +/- 3.7 cm, p = 0.002, and 0.94 +/- 0.05 vs. 0.89 +/- 0.05, p = 0.001, respectively), higher systolic and diastolic blood pressure measured by the 24-h ABPM (122 +/- 6 vs 118 +/- 8 mrnHg, p = 0.014, and 78 +/- 6 vs 73 +/- 7 mrnHg, p = 0.008, respectively), and higher nocturnal diastolic pressure load (44.6 +/- 25.9% vs 31.3 +/- 27.3%, p = 0.041). Moreover, there was a positive correlation between nocturnal diastolic blood pressure and AHI (r = 0.43, p < 0.05). Conclusions: Asymptomatic obese subjects with moderate-to-severe OSA have higher systolic and diastolic blood pressure at 24 hours compared with those with absent / mild OSA, despite normal casual blood pressure between the groups. These results indicate that ABPM may be useful in the evaluation of asymptomatic obese patients with moderate-to-severe OSA.