Shock therapy for monomorphic detected ventricular tachycardia

摘要

An implantable medical device system detects and treats monomorphic ventricular tachycardia (VT). The system includes a sensing module for receiving a cardiac signal and a therapy delivery module including a capacitor and an output circuit. A control module is coupled to the sensing module and the therapy delivery module and is configured to detect a tachycardia from the cardiac signal and initiate charging of the capacitor in response to detecting the tachycardia. The control module performs a method for simultaneously monitoring a voltage on the capacitor and a morphology of the cardiac signal during the charging and controls the therapy delivery circuit to deliver a shock pulse at less than a programmed shock energy in response to both the voltage reaching at least a minimum voltage and the morphology being monomorphic.

主权项

1. A method performed by a medical device, comprising:
sensing a cardiac signal using a plurality of electrodes coupled to a sensing module of the medical device; detecting a ventricular tachycardia in response to the cardiac signal; initiating, by a control module, charging of a capacitor to deliver a programmed shock energy for treating a polymorphic ventricular tachycardia in response to detecting the ventricular tachycardia; determining by a processor if the ventricular tachycardia during the charging is monomorphic; responsive to the ventricular tachycardia being monomorphic during the charging, terminating the charging of the capacitor; and delivering a shock pulse at less than the programmed shock energy.