Implantable cardiac device providing repetitive non-reentrant ventriculo-atrial synchronous (RNRVAS) rhythm therapy using VA interval extension and method

摘要

A system and method detects and terminates a repetitive non-reentrant ventriculo-atrial synchronous (RNRVAS) rhythm. The system and method is particularly adapted for use in an implantable cardiac stimulation device including a pulse generator that delivers atrial and ventricular pacing stimulation pulses to a heart which implements an AV delay and an atrial escape interval. The system includes a sensing circuit that senses cardiac activity of the heart and a detector responsive to the sensing circuit that determines if an RNRVAS rhythm is present. When an RNRVAS rhythm is present, a therapy control circuit lengthens the atrial escape interval for at least one cardiac cycle. In addition, the VA delay interval may be shortened by the same amount to maintain a consistent ventricular pacing rate.