Who's creating the rate?
So I'm a bit confused about how my rate is being determined. I have a dual chamber PM (Medtronics XT DR MRI SureScan) with leads in my RA and RV. According to my interagation my RA pacing in nearly 100% and my RV pacing is 70%, AP-VP is 70% and AP-VS is 30% with both AS-VP and AS-VS at essentially 0%. So my question is how is my actual rate determined. I know this PM has a Rate Response feature that uses an accelerometer to sense motion and adjust your rate based on that, but I've noticed that my rate is responding to exertion, like going up a hill or progressively liftng heavier weights, which has notihng to do with any kind of motion. My rate during exercise actually appears to be normal for the most part and even during normal activity it's about right. It will also will go up when I get anxiuos, stressed or simply angry, which again has no motion associated to it. All of this is great considering that two weeks ago I couldn't get my rate above 50 no matter what I was doing. So to me it seems like the pacemaker is taking my hearts generated signal and using it to pace me. I have AV block, so I think the pacemaker is taking the signal that's being "blocked" and sending it to where is was suppsoe to go, thus giving me a normal rate. But then I see that my Atrium is "paced" at nearly 100%, which confuses me a since it leads me to believe that the rate resonse (accelerometer) is setting my rate all the time ... this makes no sense based on what I explained above. Any thoughts would be great!