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Ventricular function after normothermic versus hypothermic cardioplegia

T M Yau1, J S Ikonomidis, R D Weisel

  • 1Division of Cardiovascular Surgery, Toronto Hospital, Ontario, Canada.

The Journal of Thoracic and Cardiovascular Surgery
|May 1, 1993
PubMed
Summary
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Warm cardioplegia improved postoperative left ventricular function compared to cold cardioplegia. This cardiac surgery technique enhanced systolic function and early diastolic relaxation, suggesting better myocardial protection.

Area of Science:

  • Cardiovascular Surgery
  • Cardiac Anesthesia
  • Cardiomyocyte Physiology

Background:

  • Traditional cold intermittent cardioplegia is standard in cardiac surgery.
  • The impact of warm cardioplegia on postoperative left ventricular function remains unclear.

Purpose of the Study:

  • To compare the effects of warm versus cold blood cardioplegia on ventricular function.
  • To evaluate load-independent indices of ventricular function post-cardiac surgery.

Main Methods:

  • Randomized clinical trial involving 53 patients undergoing cardiac surgery.
  • Assessment of myocardial metabolism (oxygen consumption, lactate, adenine nucleotides).
  • Measurement of left ventricular function using pressure-volume loops 3 hours post-operation.

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Main Results:

  • Warm cardioplegia showed improved recovery of myocardial oxygen consumption and reduced creatine kinase MB isoenzyme release.
  • Patients receiving warm cardioplegia exhibited increased end-systolic elastance and preload-recruitable stroke work index.
  • Enhanced early diastolic relaxation was observed in the warm cardioplegia group.

Conclusions:

  • Warm blood cardioplegia may offer improved myocardial protection and enhanced postoperative left ventricular systolic and diastolic function.
  • Potential benefits may be linked to improved myocardial metabolism, lactate levels, or catecholamine activity.
  • Further research is warranted to elucidate the mechanisms behind improved cardiac function with warm cardioplegia.