Patent ID: 8538522

Claim:
A cardiac pacing device, comprising: pulse generation circuitry for generating pacing pulses; sensing circuitry for sensing cardiac electrical activity; a controller for detecting cardiac events that define pacing timing intervals and for controlling the 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 right ventricular and left ventricular sensing channels; 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, wherein each of the left ventricular paces is delivered at an individually specified pacing instant in relation to expiration of an escape interval that is reset by a right ventricular sense; initiate a left ventricular protective period after a left ventricular sense; determine whether or not the pacing instants of all of a plurality of scheduled left ventricular paces fall within the initiated left ventricular protective period during a cardiac cycle and, if so, deliver a right ventricular pace upon expiration of the escape interval.