Implantable medical device for cardiac monitoring using sound

A method comprising:

• capturing, by one or more sensors of an implantable medical device, at least one of a sound or a vibration emitted by a passive implanted device implanted within a patient;
• obtaining, by processing circuitry and from the one or more sensors, a signal indicative of the at least one of the sound or the vibration captured by the one or more sensors;
• determining, by the processing circuitry and based on the at least one of the sound or the vibration captured by the one or more sensors, a physiological characteristic of the patient;
• and
• generating, by the processing circuitry, an output based on the physiological characteristic of the patient.

A system comprising:

• an implantable medical device comprising one or more sensors configured to capture at least one of a sound or a vibration emitted by a passive implanted device implanted within a patient;
• and
• an external device comprising processing circuitry configured to:
• obtain, from the one or more sensors, a signal indicative of the at least one of the sound or the vibration captured by the one or more sensors;
• determine, based on the at least one of the sound or the vibration captured by the one or more sensors, a physiological characteristic of the patient;
• and
• generate an output based on the physiological characteristic of the patient.