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Related Experiment Videos

Inotropic effects of ranitidine.

E C Meyer1, D K Sommers, M van Wyk

  • 1Department of Pharmacology, University of Pretoria.

European Journal of Clinical Pharmacology
|January 1, 1990
PubMed
Summary

Ranitidine demonstrated a positive inotropic effect on the myocardium, significantly decreasing QS2I in healthy volunteers. Cimetidine showed no significant cardiac effects, suggesting distinct mechanisms of action for these H2-receptor antagonists.

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Area of Science:

  • Cardiology
  • Pharmacology
  • Physiology

Background:

  • Cimetidine and ranitidine are H2-receptor antagonists.
  • Their effects on myocardial function require further elucidation.

Purpose of the Study:

  • To investigate the impact of cimetidine and ranitidine on myocardial function.
  • To compare the cardiac effects of these two H2-receptor antagonists.

Main Methods:

  • Controlled study involving 8 healthy male volunteers.
  • Assessment of systolic time intervals (STI) to evaluate myocardial performance.
  • Monitoring of heart rate and blood pressure.

Main Results:

  • Ranitidine significantly decreased the pre-ejection period index (QS2I), indicating a positive inotropic effect.
  • No significant changes in heart rate or blood pressure were observed with ranitidine.
  • Cimetidine did not produce significant changes in the studied cardiac parameters.

Conclusions:

  • Ranitidine exhibits a positive inotropic effect on the myocardium.
  • Structural differences between ranitidine and cimetidine may account for their distinct cardiac effects.
  • Ranitidine's action might involve enhanced noradrenaline release via H2-presynaptic receptors.

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