Patent ID: 6871097
Filing Date: 2005-03-22
Classification: A61B,A61N

Abstract:
1. A pacemaker comprising: an atrial detector adapted for interaction with a subject to detect atrial events; a ventricular detector adapted for interaction with said subject to detect ventricular events; an atrial interval determination unit for determining an interval between successive atrial events detected by said atrial detector; a comparator for comparing said interval with a predetermined atrial tachycardia limit value and which generates and records an indication of atrial tachycardia if said interval is less than said atrial tachycardia limit value; a stimulation administration arrangement adapted for interaction with said subject to administer stimulating therapy to said subject in a tracking mode and in a non-tracking mode; a mode switching unit connected to said comparator and to said stimulation administration arrangement for switching said stimulation administration arrangement from said tracking mode to said non-tracking mode when a number of said indications of atrial tachycardia recorded by said comparator reaches a predetermined count limit; a cardiac event interval determination unit for determining additional intervals between cardiac events detected by said atrial detector or said ventricular detector, during a pacemaker interval selected from the group consisting of an interval between two consecutive ventricular stimulations by said stimulation administration arrangement and two consecutive R-wave detections by said ventricular detector; and said cardiac event interval determination unit supplying said additional intervals to said comparator, and said comparator comparing said additional intervals to said tachycardia limit value and generating a non-tachycardia indication which reduces the recorded number of said indications of atrial tachycardia by one if at least one of said additional intervals during said pacemaker interval is longer than said tachycardia limit value.