Frontiers Med. Biol. Engng , Vol. 10, No. 1, pp. 59 – 66 (2000) Ó VSP 2000. Short note Maximal flow pulsation in the pial arterioles of rats at increased intracranial pressure JUNJI SEKI 1 , YASUTO SASAKI 2 , TOMOMI OYAMA 2 and JUNICHIRO YAMAMOTO 2 1 Department of Biomedical Engineering, National Cardiovascular Center Research Institute, 5-7-1 Fujishiro-dai, Suita, Osaka 565-8565, Japan 2 Laboratory of Physiology, Faculty of Nutrition, Kobe-Gakuin University, Nishi-ku, Kobe 651-2180, Japan Received 8 February 1999; revised 3 May and 3 September 1999; accepted 8 October 1999 Abstract —Red cell velocity in the brain pial arterioles (12 – 58 µ m in diameter) of rats was measured by a fiber-optic laser-Doppler anemometer microscope to study the effects of intracranial pressure (ICP) on flow pulsation. The amplitude of velocity pulsation in the pial arterioles was 24 ± 9% (mean ± SD) of the temporal mean velocity under normal physiological conditions (ICP = 5 mmHg). It increased gradually up to 40 ± 11% with increasing ICP up to 50 mmHg on average. It also increased with the vessel diameter at fixed values of ICP. In each arteriole, the velocity amplitude increased steeply at a critical value
Frontiers of Medical & Biological Engineering – Brill
Published: Jan 1, 2000
Keywords: intracranial hypertension; flow pulsation; pial microvessel; Red cell velocity; laser-Doppler anemometer
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