Changes in Central 24-h Ambulatory Blood Pressure and Hemodynamics 12Months After Bariatric Surgery: the BARIHTA Study.

Abstract

Weight loss is associated to blood pressure (BP) reduction in obese patients. There is no information on central 24-h BP changes after bariatric surgery (BS). In this study, we analyzed changes in 24-h BP 12months following BS, with intermediate evaluations at 1, 3, and 6months, in severely obese adults. The primary endpoint was aortic (central) 24-h systolic BP changes. Circadian BP patterns and hypertension resolution were also assessed. As secondary endpoints, we analyze changes in central 24-h diastolic BP as well as in all office and ambulatory peripheral BP parameters. Obese adults scheduled for BS as routine clinical care were recruited. We included 62 patients (39% with hypertension, 77% women, body mass index, 42.6 ± 5.5kg/m2). Reduction in body weight was mean (IQR) 30.5% (26.2-34.4) 1year after BS. Mean (95% CI) change in central 24-h systolic BP was - 3.1mmHg (- 5.5 to - 0.7), p = 0.01 after adjustment for age, sex, and baseline hypertensive status. BP parameter changes were different between normotensives and hypertensives. Mean (95% CI) change in central 24-h systolic BP was - 5.2mmHg (- 7.7 to - 2.7), p < 0.001, in normotensives and - 0.5mmHg (- 5.1 to 4.0), p = 0.818, in hypertensives. There was a remission of hypertension in 48% of patients. Most patients had a reduced dipping pattern, similarly at baseline and 12months after BS. Among patients with severe obesity, there was a substantial central 24-h systolic BP decrease 12months following BS. Importantly, this change was observed in those patients with normal BP at baseline. ClinicalTrials.gov Identifier: NCT03115502.