Sudden pulse drop while exercising

I posted this before, thought it was resolved but is returning. The PM was put in 5 years ago to resolve a total blockage of the signal between chambers when at rest.. While exercising, particularly on extended vigorous efforts such as on an elliptical machine, my pulse builds to the 140's (I'm 72 and have never had a high pulse rate). It then may drop suddenly to 100-120 and bounce back after 5-10 seconds. It used to be more dramatic when it would drop to 85 and stay there until I stopped the effort. I traced the trigger to caffiene and the probelm went away for about 18 months after I eliminated caffiene. Recently, it has come back as described above. So far it's an irritant but I'm concerned it will again progress to it's previous level. My PM limits are 60 and 170. Any thoughts?


7 Comments

?

by Pacer2019 - 2019-12-03 01:45:58

Is 170 considered a high setting ? Sounds higher than average 

?

by Pacer2019 - 2019-12-03 01:45:59

Is 170 considered a high setting ? Sounds higher than average 

Your PM needs to be checked and adjusted for you

by crustyg - 2019-12-03 03:36:39

If you've complete AV block then your ventricles are being paced all of the time during exercise - although you may not need pacing when resting.

It sounds as though you are activating some sort of protection mechanism (i.e. a limit that the PM has been set for) that reduces pacing rate due to detection of some adverse condition - which as Pacer2019 says is likely to be your ventricular rate.  170bpm is probably unwise at your age.

*IF* your PM is hitting some preset limit it will almost certainly make a record which can be extracted at your next interrogation.  Did you have a chat with your EP doc and team after your last post about this topic?  Was there an entry in your PM log?.

Sounds to me as though your settings need to be adjusted.

Sudden pulse drop while exercising

by Leofred - 2019-12-03 13:14:27

The 170 was arrived at by my cardiologist based on two factors:

1. I have never  had a problem with afib or tachacardia.

2. While exercising, my pulse does get to 150+ occasionally and higher when exercising at elevation where we spend some months in the winter.

When the sudden rate drop occurs, it happens after a gradual heart rate increase (20-25 minutes) of steady exercise and happens when the rate is roughly 135-145, not near 170. The drop is real, not a malfunction in my chest strap rate monitor because I feel the affects shortly before the monitor shows the drop. The events do not show up in myquarterly data, possibly because they are short-lived enough to appear negligible. 

drops

by Tracey_E - 2019-12-03 13:24:00

It doesn't sound like you are bumping your upper limit or setting off the safety mechanisms for afib, two common reasons for sudden drops. It's possible your rate is just dropping on its own. Mine does that, too, I have av block but every once in a while my rate plunges when I'm working out. The pacer was programmed to prevent it. My rate can come down gradually but if it tanks quickly, the pacer kicks in with atrial pacing to keep it up. 

Sudden pulse drop while exercising

by Leofred - 2019-12-03 13:50:19

Thank you Tracey_E , I will talk to my cardiologist to see if my PM can be simiarly programmed. That would make for some concern free exercise.

Cardiologist

by AgentX86 - 2019-12-03 17:00:10

You really should be seeing an electrophysiologist for these issues. Cardiologists are plumbers. You really need an electrician.

You know you're wired when...

Intel inside is your motto.

Member Quotes

I, too, am feeling tons better since my implant.