The purpose of temporary pacemakers is to sense intrinsic electrical activity and pace the myocardium from the inside (ie, transvenous wires) or outside (epicardial wires). Instead, it’ll detect the fast atrial activity and “switch” into a safer mode (like VVI) to basically ignore atrial activity. If a patient with a DDD dual chamber pacemaker suddenly develops an atrial tachyarrhythmia (atrial rates can exceed 500 bpm), it doesn’t make sense for the pacemaker to fire the ventricle at that rate. Now let’s briefly discuss pacemaker mode switching. There is normal atrioventricular conduction.
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