Patent ID: 8467871

Claim:
A method of selecting a cardiac resynchronization therapy (CRT) mode, the method comprising: sensing electrocardiogram (ECG) data for a patient; identifying a PR interval from the sensed ECG data; comparing the PR interval to a predetermined time threshold; and selecting a CRT mode by selecting between a synchrony optimization mode and a preload optimization mode, the selection based on the comparison of the PR interval to the predetermined time threshold, wherein: the synchrony optimization mode is selected if the PR interval is less than the predetermined time threshold, optimizes CRT for fusion between a left ventricular pulse and an intrinsic atrial activity wavefront, and comprises either a LV only CRT that stimulates only the left ventricle or a biventricular simultaneous CRT that stimulates the left ventricle and the right ventricle simultaneously; and the preload optimization mode is selected if the PR interval is greater than the predetermined time threshold, comprises a biventricular sequential CRT that stimulates the left ventricle and the right ventricle where timing between stimulation of the left ventricular and the right ventricle is optimized for fusion between respective wavefronts of the left ventricular pulse and a right ventricular pulse, and timing between atrial activity and the left ventricular pulse is optimized for blood preloading of the left ventricle.