You have performed an ECG on a patient who has a pacemaker. A portion of the ECG tracing is shown here. What type of pacemaker is indicated, and at what rate is the pacemaker set? 

A. Atrial pacemaker set at 71 bpm
B. Ventricular pacemaker set at 78 bpm
C. Atrial pacemaker set at 64 bpm
D. Ventricular pacemaker set at 83 bpm


Answer: A

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