underdrive pacing

Electrical stimulation of the heart at a rate lower than that of an existing tachycardia; designed to capture the heart between beats, i.e., to interrupt a reentry pathway in order to terminate the tachycardia.

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a method of cardiac pacing for terminating certain slow ventricular or supraventricular tachycardias by means of slow asynchronous pacing, with stimuli delivered at a rate that is not an even fraction of the tachycardia rate, in order to capture the heart rate.