Patent ID: 7181281

Claim:
A method comprising: detecting movement of an in vivo oscillator using one or more in vivo sensors, the one or more in vivo sensors being a micro-electromechanical system (MEMS) capable of measuring acceleration, the MEMS having a first dual-axis accelerometer and a second dual-axis accelerometer, the two axes of the first dual-axis accelerometer defining a first plane and the two axes of the second dual-axis accelerometer defining a second plane, and the first plane differing from the second plane; receiving information from at least one of the one or more sensors; and deciding whether to switch an implanted cardiac therapy device from a lower tier of anti-arrhythmia therapy to a higher tier of anti-arrhythmia therapy based at least in part on the information; wherein the deciding includes determining whether the received information indicates that a patient has exceeded a predetermined acceleration; and wherein the predetermined acceleration has a substantial component aligned with the acceleration of earth's gravity.