Mesenteric artery response to head‐up tilt‐induced centralhypovolaemia and hypotension
- 12 July 1997
- journal article
- research article
- Published by Wiley in Clinical Physiology and Functional Imaging
- Vol. 17 (5) , 487-496
- https://doi.org/10.1046/j.1365-2281.1997.05252.x
Abstract
Superior mesenteric artery (SMA) blood flow and impedance were evaluated byduplex ultrasound during head‐up tilt (HUT)‐induced central hypovolaemia and hypotension ineight healthy volunteers. HUT induced a reduction in cardiac stroke volume from88·8±6·3 to 64·7±6·3 ml(mean±SEM; PPP−1) did not change significantly, although the end‐diastolic velocity increasedfrom 9·7±4·8 to 39·7±4·0 cm s−1 (PP=0·04) was accompanied by a ninefoldincrease in the end‐diastolic velocity (P<0·01). The results indicate areduction in the mesenteric vascular impedance to the extent that superior mesenteric artery bloodflow is maintained during HUT‐induced central hypovolaemia and hypotension.Keywords
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