Abstract
We report two patients with inferior myocardial infarction, complicated by bradyarrhythmia, hypotension, and clinical evidence of right ventricular infarction. Conventional therapy of volume expansion and inotropic support was insufficient to maintain an adequate blood pressure. Sequential atrioventricular (AV) pacing for AV block (Case 1) or atrial pacing for junctional bradycardia (Case 2) resulted in immediate and sustained improvement in blood pressure and clinical indices of perfusion. We recommend consideration of these pacing modes in patients with inferior infarction with evidence of right ventricular infarction, bradyarrhythmia, and cardiogenic shock. The likely mechanism of improvement is by restoration of atrial transport with consequent improvement in ventricular function.
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