Patent ID: 8682428

Claim:
An implantable medical device comprising: a pulse generator that emits cardiac stimulating pacing pulses including ventricular pacing pulses; an electrode lead connected to said pulse generator configured to deliver said ventricular pacing pulses to cardiac tissue in at least one ventricle of a heart of a patient; an acoustic sensor configured to sense acoustic energy from the patient and to emit an electrical signal indicative of heart sounds of the heart of the patient over a predetermined period of a cardiac cycle during successive cardiac cycles; a signal processor supplied with said electrical signal and configured to extract an extracted signal therefrom corresponding to the heart sound, known and designated as the first heart sound, and to calculate a pulse width of the extracted signal for each of a plurality of said successive cardiac cycles; and a controller supplied with the calculated pulse widths and configured to initiate an optimization procedure by controlling said pulse generator to iteratively control delivery of said ventricular pacing pulses based on the calculated pulse widths to said at least one ventricle, wherein the controller is configured to identify an interval selected from the group consisting of an RV interval and a VV interval that brings the respective pulse widths of said heart sound signals in said successive cardiac cycles to within a predetermined pulse width range or minimizes said pulse width.