We describe a patient with acute inferior wall myocardial infarction who developed sinus node dysfunction following thrombosis of the sinus node artery during percutaneous transluminal coronary angioplasty and intracoronary stent implantation. Sinus node function normalized spontaneously over the next week, allowing beta blockers to be initiated. Our experience suggests that sinus node dysfunction in this setting may be transient and should be managed conservatively.