a) he only has 35% cardiac output
b) he only has 35 beats per minute
if its the cardiac output ( which is far more likely) what it means that some condition in the heart is causing it to pump blood not quite as effeciently.
Basically if you and i had 100%,,, then imagine our entire bodys only getting 35% of that oxygen
Yes, its a pretty serious matter that can have complications from syncope
(passing out), or other respiratory disorders, to affect everything up to and including urinary output.
* try not to worry too much about his health
Likely if he is seeing a cardiologist there are many things that can help with this.
Including medications, life-style changes, proper diet, etc etc. There are even surgeries that can now substantially improve mortality rates.
There is even a thing thats call ECP Electronic Counter-pulsation therapy.... Its a new intervention that just got implemented at our rural hospital. it has a 66% success rate.
Further more, it can reduce medication dependency, and enhance quality of life.
Hope I went above and beyond your question:
Male cardiac nurse