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Ann Thorac Surg 1983;36:437-443
© 1983 The Society of Thoracic Surgeons

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Articles

Persistent Atrial Activity during Cardioplegic Arrest: A Possible Factor in the Etiology of Postoperative Supraventricular Tachyarrhythmias

Cardiovascular Research Unit, Royal Victoria Hospital, McGill University, Montreal, PQ, Canada

^* Address reprint requests to Dr. Morin, Cardiovascular and Thoracic Surgery, Royal Victoria Hospital, 687 Pine Ave W, Room S8.30, Montreal, PQ, Canada H3A 1A1

We assessed the relationship between the duration of atrial activity during the cross-clamp period and the postoperative occurrence of supraventricular tachyarrhythmias in 50 patients undergoing elective coronary bypass operation. The atrial electrical activity was monitored continuously by means of a bipolar atrial electrogram from the onset of cardioplegic administration until removal of the aortic cross-clamp.

While ventricular arrest was induced promptly and maintained in all patients, sustained atrial activity was observed in 44 out of 50 patients during the cross-clamp period. In the postoperative period, supraventricular tachyarrhythmias developed in 15 patients (Group 1). Thirty-five patients (Group 2) were free from such tachyarrhythmias. There was no significant difference between the two groups with respect to cross-clamp time, bypass time, amount of cardioplegic solution used, or number of grafts per patient. The mean duration of atrial activity during cardioplegic arrest, however, was significantly longer in Group 1 than in Group 2 (46 ± 4.7 minutes versus 22.6 ± 4.0 minutes, respectively, p < 0.001). None of the 6 patients in whom atrial activity was completely abolished experienced supraventricular tachyarrhythmias.

The strong correlation observed between the duration of atrial activity during cardioplegic arrest and the incidence of postoperative supraventricular tachyarrhythmias suggests the possibility that these arrhythmias may be a manifestation of inadequate atrial protection during global myocardial ischemia.

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