How do stroke volume and cardiac output change during head-up and head-down tilt compared to a resting supine position in healthy humans?
Stroke volume and cardiac output are maximal in the supine position and decrease during both head-up tilt and 90-degree head-down tilt, despite increased preload in the latter.
This study confirmed that SV and CO are maximal in resting, supine, healthy humans and decrease during HUT. However, 90 degrees HDT was associated with increased LVEDV and induced a reduction in SV.
Bundgaard‐Nielsen et al. (Fri,) studied this question.
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