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- Title
Attenuation of Reactive Hyperemia Caused by Aspirin in Canine Coronary Artery.
- Authors
Miyajima, Seiichi; Aizawa, Yoshifusa; Shibata, Akira
- Abstract
Effects of intracoronary aspirin on coronary blood flow and reactive hyperemia were evaluated in closedchest, anesthetized dogs. In 18 dogs the left circumflex coronary artery was cannulated and perfused by arterial blood at a constant pressure. Coronary blood flow was measured by an electromagnetic flowmeter. Intracoronary aspirin at doses of 5, 10, and 20 mg reduced coronary blood flow in a dose-dependent manner. Injection of aspirin at doses of 10 to 25 mg also inhibited reactive hyperemia following the coronary occlusion for fifteen seconds. The mean peak flow ratio was reduced from 2.13 ± 0.42 to 1.75 ± 0.35 (p < 0.005). The increment of coronary blood flow provoked by intracoronary arachidonic acid at doses of 150 to 300 μg was almost entirely inhibited by the pretreatment of the coronary artery with aspirin. The authors conclude that aspirin increases coronary arterial resistance in a dose-dependent manner and also restricts the maximal dilating capacity, possibly by inhibition of prostacyclin synthesis.
- Subjects
HYPEREMIA; CORONARY arteries; ARTERIES; CORONARY circulation; BLOOD flow; HEART blood-vessel abnormalities; HEMODYNAMICS; ASPIRIN
- Publication
Angiology, 1989, Vol 40, Issue 9, p824
- ISSN
0003-3197
- Publication type
Article
- DOI
10.1177/000331978904000909