Your browser does not support the NLM PubReader view.

Go to this page to see a list of supporting browsers.
The Ewha Medical Journal
Ewha Womans University School of Medicine

Ewha Med J 1997; 20(3):321-326

pISSN: 1598-7450

DOI: https://doi.org/10.12771/emj.1997.20.3.321

Original Article

Effects of Head-Down Tilt Position on Cerebral Blood Flow by Transcranial Doppler

Ja Kyoung Lee, Jong In Han, Rack Kyung Chung, Gui Yong Lee, Jong Hak Kim, Chi Hyo Kim, Choon Hi Lee

Copyright ⓒ 1997. Ewha Womans University School of Medicine. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Published Online: Jul 24, 2015

Abstract

Objectives

The head-down tilt(HDT) position infuses changes in cerebral blood flow, intracranial pressure, hemodynamic and respiratory system. This study was performed to evaluate the changes in cerebral blood flow and the onset of autoregulation according to the different degree of HDT.

Methods

The subjects were 12 healthy adult female volunteers. They were divided two groups : 10° HDT(group 1) and 15° HDT(group 2). The systolic, diastolic and mean blood pressure, heart rate, end-tidal CO2 concentration and cerebral blood flow velocity on middle cerebral artery by transcranial Doppler were measured before positioning and 1,2,3,5,7,9,11 minute after positioning.

Results

There was no significant changes in cerebral blood flow velocities statistically according to the HDT under 15 degrees. In group 1, vean arterial blood pressure were increased at 5 minutes and returned to control value at 7 minutes after HDT with statistical significances. Diastolic blood pressure in group 1 were increased at 1 and 2 minutes after HDT with statistical significances. In froup 2, systolic blood pressure were increased at 5,7,9,11 minutes after HDT statistically significantly.

Conclusion

There were no significant changes of cerebral blood flow under less than 15° HDT. But systolic blood pressure were increased with 15° HDT in the healthy adults statistically significantly(p<0.05) not but clinically. So, we suggested that if HDT is required, we should take care of the partients more than 10 minutes after HDT.

Keywords: Head-down tilt position; Cerebral blood flow; Hemodynamics