Effect of aminophylline on coronary functional hyperemia and myocardial adenosine.
Effect of aminophylline on coronary functional hyperemia and myocardial adenosine.
复制标题
氨茶碱对冠状动脉功能性充血和心肌腺苷的影响。
DOI：
10.1152/ajpheart.1982.243.3.h480
复制
发表时间：
1982
期刊：
影响因子：
--
通讯作者：
Randall,JR
中科院分区：
文献类型：
--
作者：
Jones,CE;Hurst,TW;Randall,JR
The role of adenosine in coronary functional hyperemia was tested using the adenosine antagonist aminophylline. In 11 dogs left coronary blood flow (LCBF) and left ventricular oxygen extraction [(a-v)O2] were monitored. Myocardial oxygen consumption (MVO2) was calculated. Before aminophylline was administered, intracoronary infusion of 6.8 micrograms/min norepinephrine increased LCBF and MVO2 by 40-80%. Simultaneous infusion of adenosine further increased LCBF. Fifteen minutes after injection of 100 mg aminophylline, norepinephrine still increased LCBF, and the ratio delta LCBF/delta MVO2 was unchanged (P greater than 0.05). Although the functional hyperemia was not blunted, the response to infused adenosine was abolished by aminophylline. In 20 additional dogs myocardial adenosine was determined. Before norepinephrine infusion myocardial adenosine with and without aminophylline was 12.7 and 14.3 nmol/g dry wt, respectively (P greater than 0.05). During norepinephrine infusion an increase in adenosine correlated well with increases in MVO2 and LCBF, but the increase in adenosine was not greater after aminophylline. Thus the failure of aminophylline to blunt functional hyperemia was not due to a higher adenosine level after aminophylline. These results do not support a role for adenosine in functional hyperemia elicited by norepinephrine.
