This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Beasley, M. G. Articles by Gosling, R. G. Search for Related Content PubMed PubMed Citation Articles by Beasley, M. G. Articles by Gosling, R. G.

Stroke, Vol 10, 331-335, Copyright © 1979 by American Heart Association

ARTICLES

Changes in internal carotid artery flow velocities with cerebral vasodilation and constriction

MG Beasley, JN Blau and RG Gosling

Non-invasive Doppler-shift ultrasound, together with spectral analysis, have been used to study the changes in internal carotid artery flow velocity patterns that occur with cerebral vasoconstriction and vasodilation provoked by over-breathing and breath-holding. Significantly different waveform shapes, characteristic for each vessel, were demonstrated from the internal and external carotid arteries, making identification of the internal carotid certain. In 5 healthy subjects over-breathing for 3 minutes significantly lowered the mean height of the internal carotid waveform by an average of 32% (p less than 0.001). Breath-holding for 40-60 seconds raised the mean height by an average of 31% (p less than 0.001). The pulsatility index of the waveforms varied inversely to mean height. These results show that the effects of cerebral dilation or constriction are easily detected by flow-velocity changes in the internal carotid artery.

This article has been cited by other articles:

				I. Uzunca, T. Asil, K. Balci, and U. Utku Evaluation of Vasomotor Reactivity by Transcranial Doppler Sonography in Patients With Acute Stroke Who Have Symptomatic Intracranial and Extracranial Stenosis J. Ultrasound Med., February 1, 2007; 26(2): 179 - 185. [Abstract] [Full Text] [PDF]

				T. Asil, I. Uzunca, U. Utku, and U. Berberoglu Monitoring of Increased Intracranial Pressure Resulting From Cerebral Edema With Transcranial Doppler Sonography in Patients With Middle Cerebral Artery Infarction J. Ultrasound Med., October 1, 2003; 22(10): 1049 - 1053. [Abstract] [Full Text] [PDF]

				K. Dalessandri, J. N. St. John, and S. N. Carson Correction and Monitoring of Postoperative Cerebral Vasospasm Angiology, March 1, 1981; 32(3): 212 - 216. [Abstract] [PDF]