An excellent and extremely helpful update, ted3.
I am due for my annual examination of my CRT-D (Abbott/St. Jude Medical Neutrino NxT HF) next week. It has been busy "oversensing" SVTs resulting in numerous, almost daily and essentially unnecessary reports being sent to the arrhythmia clinic which monitors my device. I am completely unaware of these episodes as I am asymptomatic.
I suspect I may be moved from the current DDD mode I am in to DD1 which would result in an improvement of the discriminators or filters, thereby reducing the above mentioned reports. A tech support rep from Abbott will be attending my appointment along with the electrophysiologist who did the original implant.
I have had my CRT-D or biventricular pacemaker for 3 years and it is designed specifically or those who have heart failure. However, I am very fortunate. My EF at the time of surgery was 19% and falling. As of my last echocardiogram, my EF has improved to 56% which is considered to be in the normal range.
Congratulations on being able to resume your running program! And thank you again for sharing your knowledge. It made for a fascinating and insightful read. Take care.