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Nifedipine: a myocardial protective agent.

R E Clark, I Y Christlieb, P D Henry

    The American Journal of Cardiology
    |October 22, 1979
    PubMed
    Summary
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    Nifedipine effectively preserves heart function and structure after ischemia. This calcium antagonist reduces injury and improves blood flow, suggesting its use in cardiac surgery for enhanced myocardial protection.

    Area of Science:

    • Cardiology
    • Pharmacology
    • Cardiovascular Surgery

    Background:

    • Postischemic myocardial dysfunction remains a significant clinical challenge.
    • Calcium antagonists are explored for their cardioprotective potential.

    Purpose of the Study:

    • To evaluate the efficacy of nifedipine in preserving myocardial function and structural integrity following ischemic events.
    • To investigate nifedipine's effects on mitochondrial calcium accumulation and myocardial stiffness.

    Main Methods:

    • Experiments were conducted on isolated rabbit hearts and in vivo canine models.
    • Models included myocardial infarction, normothermic regional ischemia, and hypothermic global ischemia with reperfusion.
    • Hemodynamic function, creatine kinase levels, and injury volume were assessed.

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    Main Results:

    • Nifedipine demonstrated beneficial effects on postischemic myocardial stiffness and mitochondrial calcium uptake.
    • Administration during myocardial infarction increased ischemic zone blood flow and reduced creatine kinase loss.
    • Nifedipine decreased ischemia-reperfusion injury volume by two- to three-fold and preserved hemodynamic function.

    Conclusions:

    • Nifedipine effectively protects myocardial performance and structure against ischemic injury.
    • The agent shows promise as an adjunct to cold cardioplegia for myocardial protection during cardiac surgery.