Effect of hemorrhagic hypotension on cerebrovascular reactivity and ultrastructure in the cat.

Abstract:

BACKGROUND AND PURPOSE:The goal of this study was to determine the alterations in contractile and dilatory responses and ultrastructure of the feline middle cerebral artery after hemorrhagic hypotension. METHODS:In the sodium pentobarbital anesthetized cats, a steady 50 mm Hg level of hypotension was reached by bleeding into a reservoir and maintained at this level by further bleeding or autotransfusion for 2 hours. Rings of the arteries, from control animals and from animals after hypotension, were suspended for isometric tension recording in organ chambers filled with modified Krebs-Henseleit solution, aerated with 95% O2-5% CO2 at 37 degrees C, and their reactions to contractile and relaxant agents were tested. Vascular ultrastructure was studied by electron microscope. RESULTS:Endothelium-dependent relaxations induced by 10(-8) M acetylcholine were enhanced, whereas there was a marked inhibition of the relaxation at 10(-6) M. Relaxations induced by adenosine triphosphate and adenosine showed an impairment. Contractions induced by norepinephrine and prostaglandin F2 alpha remained unchanged, whereas 5-hydroxytryptamine caused a more pronounced contraction after hypotension. No alterations in the morphology of endothelium or smooth muscle were found after hemorrhage. There was, however, a marked decrease in the number of transmitter vesicles in the perivascular nerve terminals. CONCLUSIONS:The present results show marked alterations in cerebrovascular reactivity and ultrastructure of the adventitia after hypotension. These alterations might play an important role in the development of cerebral vasoconstriction during and after this hemorrhagic state.

journal_name

Stroke

journal_title

Stroke

authors

Kovách AG,Szabó C,Faragó M,Lohinai Z,Fehér E

doi

10.1161/01.str.22.12.1541

subject

Has Abstract

pub_date

1991-12-01 00:00:00

pages

1541-7

issue

12

eissn

0039-2499

issn

1524-4628

journal_volume

22

pub_type

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