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Ann Thorac Surg 1979;27:49-54
© 1979 The Society of Thoracic Surgeons

Articles

Ultrastructural Integrity of Human Ventricular Myocardium Following Cardioplegic Arrest

Vernon W. Fischer, Ph.D.*, Hendrick B. Barner, M.D.

Departments of Anatomy and Surgery, St. Louis University Medical Center, St. Louis, MO.

Accepted for publication April 4, 1978.

* Address reprint requests to Dr. Fischer, Department of Anatomy, St. Louis University School of Medicine, 1402 S Grand Blvd, St. Louis, MO 63104.

The appearance of the ventricular myocardium in 6 patients electing coronary bypass operation was evaluated by electron microscope before and after aortic cross-clamping. Bypass protocol included the induction of hypothermic cardioplegia by intermittent aortic root perfusion, with potassium chloride added to cold blood serving as the cardioplegic agent. Cross-clamp intervals ranged from 66 to 125 minutes.

Ultrastructural alterations following bypass manipulations, and distinct from those observed before cross-clamping, were limited to the presence of extensive myocardiocytic pooling of glycogen. Scrutiny of the intramyocardial capillary bed following perfusion with the cardioplegic solution revealed no abnormalities attributable to, or intensified by, the bypass maneuver. These findings indicate that hypothermic potassium cardioplegia, as specified, is not injurious to human myocardial ultrastructure.




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