Why the study?
Does digoxin 0.5 mg IV alter myocardial oxygen supply and demand in adult patients after coronary bypass?
Does digoxin 0.5 mg IV alter myocardial oxygen supply and demand in adult patients after coronary bypass?
A single IV dose of digoxin after coronary bypass increases myocardial oxygen consumption, but this is well-compensated without causing myocardial ischemia.
Single IV digoxin post-CABG appears compensated without ischemia; leaves open questions for randomized confirmation in cardiac surgery.
Although digoxin is used frequently in patients in the prophylaxis of postoperative supraventricular tachyarrhythmias, the effects of the drug on myocardial oxygen supply and demand after coronary bypass have not been described. Seven adult patients with good ventricular function who underwent myocardial revascularization were studied before and three hours after digoxin (0.5 mg, iv). There were no significant changes observed in any measured systemic hemodynamic variable. Evaluation of global myocardial metabolism showed an increase in myocardial oxygen consumption (P less than 0.05) which was compensated satisfactorily, as no significant alteration was noted in the coronary sinus oxygen content, or in the lactate gradient across the myocardium. Since the authors studied the effects of only one dose of digoxin, the effects of full digitalization in these patients remains to be defined.
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Sethna et al. (1982) studied this question.
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