Features of the Response of Arterial Blood Flow to the Orthostatic Load in Young Women With Idiopathic Arterial Hypotension

Abstract

The aim of the study was to evaluate the response of arterial blood flow to the orthostatic load in young women with idiopathic arterial hypotension (IAH).Material and methods. A comparative analysis of systemic hemodynamics and peripheral arterial blood flow parameters was performed for orthostasis between two groups of women aged 1825: test with IAH (n = 73) and control (n=37). The SBP level in the test group was 90-98 mm Hg, in the control group - 120-129 mm Hg. BP, heart rate and angio-scanning were performed twice: at rest, lying after 15 minutes rest and during the first minute of orthostasis. Blood flow was studied in the right vertebral, radial and posterior tibial arteries. The following parameters were evaluated: diameter during diastole, peak systolic and terminal diastolic blood flow velocity.Results. In young women with IAH, as those with normal arterial pressure, orthostasis was accompanied by an increase in SBP, DBP and an increase in heart rate. With hypotension, an increase in the diameter of the vertebral artery and a decrease in the diameter of the posterior tibial artery were detected. In both groups, orthostasis was accompanied by a decrease in the rate of blood flow, both during systole and diastole.The conclusion. Orthostasis with IAH is accompanied by an increase in SBP, DBP and heart rate. The response of peripheral arteries to orthostasis is characterized by a change in the diameter of the vessels, which indicates a pronounced adaptive response to the physiological stress load.