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Related Experiment Videos

Optimal flow rates for integrated cardioplegia

V Rao1, G Cohen, R D Weisel

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

The Journal of Thoracic and Cardiovascular Surgery
|February 6, 1998
PubMed
Summary

Integrated cardioplegia with high flow (200 ml/min) effectively clears lactate and hydrogen ions, improving ventricular function after coronary bypass surgery compared to low flow rates.

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Area of Science:

  • Cardiovascular Surgery
  • Myocardial Protection

Background:

  • Antegrade cardioplegia can be limited by coronary occlusions.
  • Retrograde cardioplegia may lead to inhomogeneous perfusion and metabolite buildup.
  • Integrated cardioplegia aims to improve metabolite washout.

Purpose of the Study:

  • To compare high (200 ml/min) versus low (100 ml/min) flow rates for integrated cardioplegia.
  • To determine optimal flow rates for metabolite washout during coronary bypass surgery.

Main Methods:

  • Prospective randomized trial of 20 patients undergoing isolated coronary bypass surgery.
  • Comparison of two flow rates for tepid blood cardioplegia delivery.
  • Measurement of myocardial metabolism via arterial and coronary sinus blood sampling.

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Main Results:

  • Higher flow rates (200 ml/min) significantly increased washout of lactate and hydrogen ions.
  • Improved ventricular function was observed in the high flow group post-reperfusion.

Conclusions:

  • Tepid retrograde cardioplegia alone can cause toxic metabolite accumulation.
  • Integrated cardioplegia with antegrade vein graft infusions enhances metabolite washout.
  • A flow rate of 200 ml/min optimizes washout and improves ventricular function, potentially enhancing coronary bypass surgery outcomes.