A dual chamber pacemaker having means for operating in different pacing modes, including dual chamber modes, contains the capability of switching into a fixed rate ventricular pacing mode and of sensing early atrial signals without affecting the ventricular pacing timing. The timing of a plurality of...http://www.google.es/patents/US4515161?utm_source=gb-gplus-sharePatente US4515161 - Dual chamber pacemaker system with V-A time measurement apparatus and method
Dual chamber pacemaker system with V-A time measurement apparatus and method
