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Related Experiment Videos

Hibernating myocardium in heart failure.

Gurbir Bhatia1, Michael Sosin, John F Leahy

  • 1Sandwell Hospital, Department of Cardiology, Sandwell and West Birmingham NHS Trust, West Bromwich, UK.

Expert Review of Cardiovascular Therapy
|February 23, 2005
PubMed
Summary

Identifying hibernating myocardium, or viable but dysfunctional heart muscle, can guide revascularization decisions. Revascularization may improve survival in patients with ischemic left ventricular systolic dysfunction and viable myocardium.

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Area of Science:

  • Cardiology
  • Cardiovascular Physiology

Background:

  • Ischemic left ventricular systolic dysfunction can stem from myocardial necrosis or viable but hypocontractile tissue.
  • Hibernating myocardium refers to viable, dysfunctional tissue that may recover contractility after revascularization.
  • Observational data suggest revascularization offers survival benefits over medical therapy in selected patients.

Purpose of the Study:

  • To review the pathophysiology of hibernating myocardium.
  • To discuss outcomes following revascularization for ischemic left ventricular dysfunction.
  • To compare diagnostic techniques for identifying viable myocardium.

Main Methods:

  • Review of existing literature on hibernating myocardium and revascularization outcomes.
  • Analysis of functional imaging techniques (stress echocardiography, cardiac MRI) versus nuclear modalities for detecting viable myocardium.

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  • Discussion of the sensitivity and specificity of various diagnostic methods.

    • Main Results:

    • Revascularization may provide a survival benefit for patients with ischemic left ventricular systolic dysfunction and viable myocardium.
    • Functional imaging methods (stress echo, CMR) show higher specificity but lower sensitivity for hibernating myocardium compared to nuclear techniques.
    • The availability of diagnostic methods for hibernating myocardium varies.

    Conclusions:

    • Identifying hibernating myocardium is crucial for selecting patients who will benefit from revascularization.
    • A comprehensive understanding of pathophysiology and diagnostic modalities is essential for optimal patient management.
    • Ongoing randomized trials are critical to confirm survival benefits.