Systems and methods for communicating cardiac events between a plurality of implantable medical devices. In one example, a system comprises a first leadless cardiac pacemaker (LCP) implantable at a first heart site and a second leadless cardiac pacemaker (LCP) implantable at a second heart site. The first LCP is configured to communicate information related to a cardiac event that is sensed by the first LCP at the first heart site to the second LCP, and the second LCP is configured to deliver one or more cardiac pacing pulses to one or more pacing electrodes of the second LCP based, at least in part, on the communicated information received from the first LCP.
