Abstract: An implantable system and method are provided for detecting myocardial electrical recovery time and for controlling the delivery of cardiac stimulation pulses relative to the detected recovery time. One or more fiducial points on a T-wave signal sensed from one or more intracardiac EGM or subcutaneous ECG signals are detected for estimating myocardial recovery time. Extra systolic stimulation pulses are delivered at an extra systolic interval based on a detected recovery time to effectively produce post-extra systolic potentiation while preventing delivery of extra systolic stimuli during the vulnerable period.

Abstract: The invention is directed to pacing techniques designed to avoid competitive atrial pacing. In particular, the techniques dynamically adjust a non-competitive atrial pacing (NCAP) interval based on sensed cardiac conditions. An apparatus capable of delivering pacing stimuli, such as a pacemaker or an implantable cardioverter/defibrillator (ICD), is described that inhibits delivery of an atrial pacing stimulus for an NCAP interval having a duration that is adjusted according to sensed cardiac conditions. The apparatus may adjust the duration of the NCAP interval when sensing, for example, premature ventricular contraction (PVC), pacemaker mediated tachycardia (PMT), or atrial arrhythmia (AA).

Abstract: Notifying a patient or another person of an arrhythmia episode facilitates management of atrial fibrillation (AF) and other arrhythmias, including atrial flutter, atrial tachycardia, and supra ventricular tachycardia, thus enabling the patient to take corrective action even in the absence of symptoms or latent cardiac problems. For example, the patient may be prompted to take a medication, to initiate electrical therapy in the form of pacing or defibrillation, or to seek medical attention. Notification may be issued either by an implantable medical device or by an external device in communication with the implantable medical device. Various types of notifications may be issued under a variety of conditions, some of which may be associated with the duration of an episode.

Abstract: The invention is directed to pacing techniques designed to avoid competitive atrial pacing. In particular, the techniques dynamically adjust a non-competitive atrial pacing (NCAP) interval based on sensed cardiac conditions. An apparatus capable of delivering pacing stimuli, such as a pacemaker or an implantable cardioverter/defibrillator (ICD), is described that inhibits delivery of an atrial pacing stimulus for an NCAP interval having a duration that is adjusted according to sensed cardiac conditions. The apparatus may adjust the duration of the NCAP interval when sensing, for example, premature ventricular contraction (PVC), pacemaker mediated tachycardia (PMT), or atrial arrhythmia (AA).