Rhythm Discrimination With A Floating Endocardial Catheter

A floating endocardial catheter design is proposed for simultaneous acquisition and discrimination of atrial and ventricular rhythms. On this catheter, one sensor is located inside the atrium and the other inside the ventricle; both these sensors record composite amal and ventricular complexes. To discriminate atrial rhythm from ventricular rhythm, two adaptive filters are developed: 1) adaptive impulse correlated filter, and 2) adaptive series feedback filter. These filters cancel the unwanted rhythm from thecomposite signals using the least mean squares filtering algorithm. The filter output consists of separate atrial and ventricular rhythms which may then be used for tachyarrhythmia discrimination in implantable cardioverterdefibrillator devices.