This is a good example of an AV Sequential pacemaker in a patient with an intact AV conduction system. The pacemaker is pacing the right atrium, and the impulse is being transmitted normally down through the AV node and the interventricular conduction system.
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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