I had a heart attack in 2004. EKG showed no heart muscle damage. I have had nuclear stress test last year(2010) and it showed normal EKG.
Few days ago while I was bicycling early morning (7 AM) in rather warm weather (82 F) after only 4 miles, I felt very uncomfortable and very tired. There was left shoulder pain and all of left hand was very tired for many hours. So around I went o my doc's office and they did an EKG. It showed all was fine except that the P-R interval was 230 mSec. Last year's (2010) EKG was normal but I don't know the exact P-R interval number.
Should I be concerned? Not at all, a little, a lot? Should I slow down my exercises? I routinely push my heart rate to 180-185 bpm for a minute or so but several times in an hour's jog. Stop doing that? It doesn't matter?
Appreciate your comment, particularly if you are a cardiologist and a jogger/runner.
I strongly doubt you will find someone who is both a cardiologist and a runner here (though cardiologists tend to keep in good shape). This is a community, not an "ask a doctor" forum.
Anyway, the fact that you are able to push your heart rate to 185 bpm is itself a sign that your (borderline) 1st degree AV block probably decreases with higher heart rate. A stress test will confirm that. 1st degree AV block (PR above 220 msec) is usually a benign condition, and your PR time is just borderline long. PR time will, as mentioned above, change from moment to moment, it changes with heart rate, adrenaline/stress, electrolytes in the blood, etc. Beta blockers and calcium channel blockers may prolong the PR interval.
I think you should ask your doctor if it's safe for you after a heart attack to push your heart rate to 185 bpm. "Calculated" max heart rate for you is 165 bpm, but this rule has a lot of exceptions. In my family, the maximum heart rate is high, I have a max heart rate of 220, and my mom who is about your age, have a max heart rate of 190. What of course is important, especially after a heart attack, is to make sure that you are in normal sinus rhythm when your heart rate is this high. I assume your stress test did confirm this.
Take care, and I hope a doctor will answer you (it may happen but it's quite uncommon here)
Copyright 1994-2016 MedHelp International. All rights reserved.
MedHelp is a division of Aptus Health.
This site complies with the HONcode standard for trustworthy health information.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.