Atrium-controlled heart pacemaker

摘要

An atrium-controlled heart pacemaker operates using set parameters including a smallest synchronous interval (SSI) between two stimulation pulses, a minimum atrial-ventricular delay time (AVmin) and a maximum atrial-ventricular delay time (AVmax). A control unit, dependent upon the appearance of an atrial signal, controls operation of the pacemaker such that the pacemaker operates with a variable pulse rate (DDD mode) when the atrial signal appears after a point in time SSI-AVmin, operates the pacemaker with a highest synchronous pulse rate when the atrial signal is between the points in time SSI-AVmin and SSI-AVmax, and causes no stimulation pulses to be emitted when the atrial signal appears before the point in time SSI-AVmax.