a non - invasive bodily - attached ambulatory medical monitoring and treatment device with pacing is provided . the noninvasive ambulatory pacing device includes a battery , at least one therapy electrode coupled to the battery , a memory storing information indicative of a patient &# 39 ; s cardiac activity , and at least one processor coupled to the memory and the at least one therapy electrode . the at least one processor is configured to identify a cardiac arrhythmia within the information and execute at least one pacing routine to treat the identified cardiac arrhythmia .