The Effects of Modulation of the L-Arginine-Nitric Oxide Pathway on Myocardial Stunnitig Following Repetitive Coronary Occlusion in Dogs

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Title ( eng )
The Effects of Modulation of the L-Arginine-Nitric Oxide Pathway on Myocardial Stunnitig Following Repetitive Coronary Occlusion in Dogs
Creator
Morishita Nobuyuki
Source Title
Hiroshima Journal of Medical Sciences
Volume 44
Issue 4
Start Page 119
End Page 127
Journal Identifire
[PISSN] 0018-2052
[EISSN] 2433-7668
[NCID] AA00664312
Abstract
In order to determine the role of nitric oxide (NO) in myocardial stunning, the effects of both augmenting and inhibiting NO production on contractile function, following repetitive coronary occlusions, were evaluated in anesthetized dogs. The effect of the experimental protocol on endothelial function was also assessed. The increases in coronary blood flow in response to acetylcholine and nitroglycerin at 30 and 60 min after reperfusion were similar to those before coronary occlusions. Therefore, loss in vasodilator reserve was not observed following the multiple coronary occlusions used in this study. NG-nitro-L-arginine methyl ester (L-NAME) elevated blood pressure slightly, but did not change left ventricular end-diastolic pressure, left ventricular maximum positive dp/dt, and coronary blood flow. Although the degree of systolic bulging and collateral circulation during coronary occlusions was comparable to the control group, contractile function after reperfusion was significantly worse in the presence of L-NAME than in the control. The recovery of contractile function was also considerably delayed with administration of L-arginine. This deleterious effect on contractile function was not observed with its enantiomer D-arginine. Differences in collateral blood flow determined with microspheres and hemodynamic variables did not account for the effects of L-arginine. These results suggest that endogenous NO is important in limiting myocardial stunning following repetitive coronary occlusion. However, NO may be cytotoxic when present in substantial excess.
Keywords
Myocardial stunning
Nitric oxide
Arginine
Descriptions
This study was in part presented at the 43rd Annual Scientific Session of the American College of Cardiology, Atlanta, GA., 1994, and published in abstract form (1994, J. Am. Coll. Cardiol. 23 [suppl A]: 263A).
NDC
Medical sciences [ 490 ]
Language
eng
Resource Type departmental bulletin paper
Publisher
Hiroshima University Medical Press
Date of Issued 1995-12
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 0018-2052
[NCID] AA00664312