PMID: 9174658Apr 1, 1997Paper

Non-invasive continuous arterial pressure, heart rate and stroke volume measurements during graded head-up tilt in normal man

Clinical Autonomic Research : Official Journal of the Clinical Autonomic Research Society
L A H CritchleyJ A Critchley

Abstract

The haemodynamic effects of head-up tilt (HUT) at different tilt angles were investigated non-invasively in eight normal male subjects. Mean arterial pressure (MAP; by Ohmeda Finapres 2300), stroke volume (SV) and heart rate (HR; by BoMed NCCOM3-R7S) were continuously recorded whilst performing a series of HUTs (55 degrees, 10 degrees, 20 degrees, 30 degrees and 55 degrees) lasting 3 min each. The response to HUT was proportional to the sinc of the tilt angle. The magnitude of the response varied between subjects. HUT to 55 degrees resulted in mean (95% confidence limits) increases in MAP by 16 (+/-16)% and HR by 11 (+/-24)% and a decrease in SV by -25 (+/-22)%. These results were repeatable after 30 min. At small tilt angles, i.e. < or = 20 degrees, MAP did not change and HR decreased by -3 (+/-4)%. A detailed analysis revealed immediate dynamic (0-30 s), late dynamic (30-90 s) and plateau (after 90 s) phases in the response to HUT. In conclusion, HUT produces reproducible haemodynamic effects, although differences exist among subjects. A detailed analysis of these effects can be successfully performed using non-invasive methods.

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Citations

Feb 16, 2000·Canadian Journal of Anaesthesia = Journal Canadien D'anesthésie·K S KhawL A Critchley
Apr 7, 2009·Critical Care : the Official Journal of the Critical Care Forum·Lester A H Critchley
Sep 26, 2003·Journal of Neurosurgical Anesthesiology·Pernille HaureJens Rolighed Larsen
Oct 15, 1998·Anaesthesia·L A Critchley
May 28, 2005·Anesthesia and Analgesia·Lester A H CritchleyAnthony E James
Sep 25, 2017·Physiological Research·J KrohovaM Javorka
Jan 9, 2017·Journal of Clinical Monitoring and Computing·Bernd SaugelThomas W L Scheeren
Aug 25, 2005·Experimental Biology and Medicine·Hong GuoXiangrong Shi
Nov 5, 2020·Prehospital and Disaster Medicine·Emre Gökçen, Vahit Demir

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