A non-invasive medical device includes a garment; at least one therapy electrode and a plurality of ECG sensing electrodes disposed in the garment; a memory storing ECG information of the patient; a therapy delivery interface; and at least one processor configured to identify, within the ECG information, at least one cardiac arrhythmia condition; determine at least one pacing routine corresponding to the detected cardiac arrhythmia condition; cause the therapy delivery interface to execute the at least one pacing routine by delivering a first pacing pulse; determine, subsequent to the first pacing pulse, that a first interval has passed without detection of an intrinsic heartbeat, and in response, cause the therapy delivery interface to continue executing the at least one pacing routine by delivering a second pacing pulse; and responsive to determining that the intrinsic heartbeat is detected within the first interval, suspend execution of the at least one pacing routine.