Orthostatic stress causes immediately increased blood pressure variability in women with vasovagal syncope

Computer Methods and Programs in Biomedicine
S ReuleckeT Aljama-Corrales

Abstract

The cardiovascular and respiratory autonomic nervous regulation has been studied mainly by hemodynamic responses during different physical stressors. In this study, dynamics of autonomic response to an orthostatic challenge was investigated by hemodynamic variables and by diverse linear and nonlinear indices calculated from time series of beat-to-beat intervals (BBI), respiratory cycle duration (RESP), systolic (SYS) and diastolic (DIA) blood pressure. This study included 16 young female patients (SYN) with vasovagal syncope and 12 age-matched female controls (CON). The subjects were enrolled in a head-up tilt (HUT) test, breathing normally, including 5min of baseline (BL, supine position) and 18min of 70° orthostatic phase (OP). To increase the time resolution of the analysis the time series were segmented in five-minute overlapping windows with a shift of 1min. Hemodynamic parameters did not show any statistical differences between SYN and CON. Time domain linear analysis revealed increased respiratory frequency and increased blood pressure variability (BPV) in patients during OP meaning increased sympathetic activity and vagal withdrawal. Frequency domain analysis confirmed a predominance of sympathetic tone by steadily incr...Continue Reading

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Citations

Feb 15, 2018·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Michal JavorkaMathias Baumert
Oct 11, 2017·IEEE Journal of Biomedical and Health Informatics·Sina ReuleckeTomas Aljama-Corrales
Jan 6, 2021·Journal of Hypertension·Nour-Mounira Z BakkarSouha A Fares
Jun 3, 2021·Journal of Clinical Medicine·José M Torres-ArellanoClaudia Lerma

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