Electrocardiographic manifestations of the rapid recharge function of pulse generators after sensing

In this report, we present our observations in three patients with Medtronic Spectrax VVI pulse generators that exhibited unusually clear electrocardio-Spectrax VVI pulse generators that exhibited unusually clear electrocardiographic artifacts, due to the rapid recharge function upon sensing. Although many contemporary pulse generators contain rapid recharge circuits operative after the delivery of a pacemaker stimulus, only certain Medtronic Spectrax pulse generators also possess a rapid recharge capability after sensing. Rapid recharge upon sensing may produce electrocardiographic deflections that should not be misinterpreted as pacemaker malfunction.