Venous response to orthostatic stress

American Journal of Physiology. Heart and Circulatory Physiology
Ineke KrabbendamMarc E A Spaanderman

Abstract

Head-up tilt (HUT) induces a reduction in preload, which is thought to be restored through sympathetic venoconstriction, reducing unstressed volume (V(u)) and venous compliance (VeC). In this study, we assessed venous inflow and outflow responses and their reproducibility and determined the relation with autonomic function during HUT. Eight healthy non-pregnant women were subjected to 20 degrees head-down tilt to 60 degrees HUT at 20 degrees intervals. At each rotational step, we randomly assessed forearm pressure-volume (P-V) curves (venous occlusion plethysmography) during inflow (VeC(IN)) and outflow [venous emptying rate (VER(OUT))]. VeC(IN) was defined as the ratio of the slope of the volume-time curve and pressure-time curve, with direct intravenous pressure measurement. VER(OUT) was determined using the derivate of a quadratic regression model using cuff pressure. We defined V(u) as the y-intercept of the P-V curve. We calculated, for both methods, the coefficients of reproducibility (CR) and variation (CV). Vascular sympathetic activity was determined by spectral analysis. VeC(IN) decreased at each rotational step compared with the supine position (P<0.05), whereas VER(OUT) increased. CR of VeC(IN) was higher in the sup...Continue Reading

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Citations

Jul 6, 2012·Human Reproduction·Janneke DonckersMarc E A Spaanderman
Nov 10, 2017·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·W GyselaersUNKNOWN International Working Group on Maternal Hemodynamics
Sep 10, 2015·Hypertension·Ralph R ScholtenMarc E A Spaanderman
Jan 28, 2009·American Journal of Physiology. Heart and Circulatory Physiology·Kevin D Monahan

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