An implantable medical device (IMD) may be configured for deployment at a patient's atrioventricular septum in order to sense and/or pace a patient's heart. The atrioventricular septum of the patient's heart may have an atrial facing side defining part of the right atrium of the patient's heart and a ventricle facing side defining part of the left ventricle of the patient's heart. The IMD may include a first component configured to be positioned at least in part in the right atrium of the patient's heart proximate the atrioventricular septum, and a second component configured to be positioned at least in part in the left ventricle.
