No instructor's collection should be without an atrial paced rhythm OR a right bundle branch block. Here, you get both. First, the atrial pacing. This patient had a sinus node problem, but his AV conduction system was functional (if not perfect). At this time, he is able to conduct impulses from the atria to the ventricles. What he cannot do is reliably produce the impulse in his atria. So, this pacemaker is currently pacing the right atrium, producing a paced "P" wave, which is then conducted to the ventricles.
This strip for your basic students is a nice example of atrial pacing in a patient with an intact interventricular conduction system. Generally, the pacemaker will behave this way when the sinus node is not functioning well enough to provide adequate rate for the patient, and the conduction system from the AV node down is functioning properly.
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