Patent ID: 8600501

Claim:
A cardiac pacing device, comprising: pulse generation circuitry for delivering pacing pulses; sensing circuitry for sensing cardiac electrical activity; a controller for detecting cardiac events that define pacing timing intervals and for controlling delivery of pacing pulses in accordance with a programmed mode; a switch matrix operable by the controller for connecting the pulse generation circuitry and sensing circuitry to selected electrodes in order to form selected sensing and pacing channels; wherein the controller is programmed to: sense cardiac activity through a right ventricular sensing channel; operate in a normal pacing mode or a biventricular-triggered pacing mode; in a normal pacing mode, schedule delivery of paces through left ventricular pacing channels to at least two left ventricular sites during a cardiac cycle interval that is reset by a right ventricular sense; in a biventricular-triggered pacing mode, when triggered by a right ventricular sense, deliver a pace to the right ventricle through a right ventricular pacing channel and deliver multiple paces to the left ventricle at selected left ventricular sites, wherein at least one first left ventricular pace is delivered coincident with the right ventricular pace immediately after a right ventricular sense and at least one subsequent left ventricular pace is delivered after a selected interval.