Just Sinus Bradycardia or Something More Serious?

Figure 3

Exercise Treadmill Test. (a) Peak-exercise ECG on initial ETT, prior to antiarrhythmic medications, showing polymorphic PVCs and bigeminy (arrows). (b) Peak-exercise ECG on ETT during esmolol infusion, showing sinus rhythm with suppression of PVCs.

(a)

(b)