It’s more likely going to be something else you’ve done; 2 uses (even at prolonged sessions) is highly unlikely to cause any long term health effects on heart rate.
How much of an increase are we talking?
What else had you been doing in the 2-3 days before? Any fitness aids, caffeine, stress? Lack of sleep?
If it is just 2 days usage 45 days ago, don’t worry. If it was 2 days usage a week for the past six weeks, stop doing CV until your body repairs itself (give it a few days or so, at least until your resting heart rate is at its normal level).
If you put your heart under even more stress after caning it for a weekend its going to give out. I won’t touch anything CV related for at least 4-5 days after a night session as its not worth the risk you put on yourself.
