Do you mean his heartbeat does down to 34, if so that is not normal.
First he needs a 24 monitor ECG, like a small backpack, with a box double the size of cigarette pack, you wear for 24 hours even go to sleep with it on, and then they can read the results.
Does he get breathless when he exerts himself, ie mowing the lawn, and excessivly sweaty, but he must try to keep himself fit, must not be sitting around doing nothing.
Sounds to me like a heart issue, may not be blockages, could be electrical issues with his heart.
How do I know this, my husband has heart failure, diagnosed 6 years ago, has lived years past his expected death date, they thought his heart failure was caused by a virus, because when they did the angiogram (dye) he had no blockages, and they could find no other cause.
This time last year he reported to me at 6am in the morning he felt dizzy and his legs were wobbly, felt he couldn't stand up, came on suddenly when he woke up, as he had been OK at 4am when he went to toilet.
I used our little home blood pressure monitor (Omron), which also gives me the reading of his heart beat, BP 120/65, which is normal for him, but heart beat at 30, not normal, took him to the heart hospital, local hospital not good enough, and I don't trust them from previous bad experience.
After alot of arguing with junior Dr's suggesting the pain was everything but his heart a senior consultant overheard me arguing loudly with the junior Dr's and came into the room asking what all the noise was about, I was so angry by that time I gave it to him as well, he agreed with me, spun on his heel ordered the junior Dr's to his office with husbands file, 20 minutes later consultant came back and said you are right it is his heart, the electrical part of his heart, pacemaker and defribulator installed later the same day.
Husband reported his energy came back the second they switched it on, also the pain in his left arm and weakness of same arm was gone, also his lack of ability to wee or very slow cleared up, Dr's reaction has been a shrugg of shoulders when we tell them that.
We have since been told he has 100% branch bundle blockage, I suspect lucky to be alive, although haven't been told that outright.
How do I know all of this, 6 years ago I knew nothing about heart issues, but for me knowledge is power, so I hit the local library and started reading all their heart books until I was completly bored with the same, then approached out local GP for his cardio books, devoured them as well, then started on the DR to Dr papers on the internet, nearly scared myself silly, but I said to myself that is not my husband, as i already knew about the lack of blockages in his heart, apparently rare about 2% of the population, so kept reading.
Even the consultant cardio said I want you here in the hospital where did you do your nursing training, I had to disappoint him, I have no nursing training as such, much to his amazement.