IMPLANTABLE CARDIAC DEVICE CONFIGURED TO DETECT REDUCED CARDIAC WALL MOTION AND TO ACTIVATE TRANSMITTERS UPON DETECTION

摘要

An anchorable implantable cardiac medical device (100) comprises a wall motion detector and a wireless communications module, which employs a directional antenna. Transmitter elements of the communications module are only activated for communication during a detected period of reduced ventricular wall motion. The period of reduced ventricular wall motion may comprise at least one time interval during which an axis of the directional antenna does not rotate out from a baseline orientation by more than 15 degrees. The communication may be conducted with an external programmer device (200) or with another implanted device (300), for example, located remote from the heart.