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      Effects of Sodium Nitroprusside on Function of Regional Ischemic Myocardium

      ,

      Cardiology

      S. Karger AG

      Vasodilator therapy, Heart failure, Afterload reduction, Myocardial ischemia

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          Abstract

          In the presence of regional myocardial ischemia, a 20% decrease in systemic arterial pressure following nitroprusside caused a 25% decrease in coronary perfusion pressure in animals with normal left ventricular end-diastolic pressures. This pressure decrement resulted in a significant decrease in the shortening of the regionally ischemic segment during the ejection phase of systole. A comparable arterial pressure drop of 21% with nitroprusside infusion during ischemia in the animals with elevated diastolic pressures caused a similar 28% decrease in coronary perfusion pressure, but resulted in a simultaneous increase in regional shortening. For the entire group there was no significant change in stroke volume. Even in the 11 animals where stroke volume increased, systolic regional shortening increased in only 4. An increase in stroke volume cannot be used to infer a parallel increase in the performance of a regionally ischemic segment. Nitroprusside appears to improve regional performance only in the presence of severe failure.

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          Author and article information

          Journal
          CRD
          Cardiology
          10.1159/issn.0008-6312
          Cardiology
          S. Karger AG
          0008-6312
          1421-9751
          1979
          1979
          31 October 2008
          : 64
          : 1
          : 12-23
          Affiliations
          Department of Physiology, University of South Alabama College of Medicine, Mobile, Ala.
          Article
          170574 Cardiology 1979;64:12–23
          10.1159/000170574
          758985
          © 1979 S. Karger AG, Basel

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          Page count
          Pages: 12
          Categories
          Original Paper

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