Heart rate stays low or drops during exercise
Hi im new to this group - thankyou.
FYI male 60+, 96kgs, regular road cyclist average 10,000km pa for some years now.. Im not elite, dont race anymore but enjoy strong, safe and fastish group rides.. I used to have strong powerful mid game on long rides, but not a climber or sprinter..
Two months ago I had a biotronik endora 8 dr-t implanted after 18mths of denial and tests.
My problem was that after cycling for approx 45min my heart rate would drop from a comfortable say 130 - 150 to below 100... after another 10 - 20 min my legs tired to the point i had to reduce intensity and speed altough had no real increase in respiration just a drop in HR.. Weekend rides were often 2-3+ hours and weekdays 1.5hours. It was frustrating that i could comfortably lead out then have to drop off the back after 45min or so... I never felt nauseous or lacked control, just no power and sometimes a few seconds of feeling faint before the HR drop... This was worse if there was any incline..
Tests say i have a constant 1st degree heart block with occasional second degree heart blocks (type 1 & 2)... (for as long as i can remember I have had missing heart beats particularly at rest..) Before the pacer my resting HR was typically 50ish and in the months leading up to the implant was often unusaully in the low 40s.. Despite a number of stress tests and wearing a holter for a month nothing was detected apart from ECGs showing the heart blocks.. Valves, heart size, wall thickness & function all OK..
Since the implant i have noticed i dont have dizzy spells when i get up in the morning or after intense exercise, however my heart rate (that is now set to be 50low and 150max) is typically 50-51 low but rarely above 130 high, in fact some days despite effort it wont go above 100 for most of the ride.. Also it is rare now that i can have the luxury of a steady increase in HR to say 130 - 140 without it falling to 60-90 after 45min the back up to 110. I have found the way to get it back is if i stop, rest for 10min and start all over... Since the pacer chest straps dont seem to work anymore so i use my garmin fenix watch.. that i have checked manually when i stop and appears to be accurate.
Since the implant i have seen my cardoligist once who reported that the pacer is working regularly and is doing its thing although had no answer for the exercise issue.. We agreed to give it a bit more time and i will see him again in about a month.. I as wondering if anyone knows of similar conditions or can suggest what i can ask the cardolgist..
In reading about the Biotronik - it has a "Closed Loop Simulation" function - ill ask if that is working..
Thanks again Q
You know you're wired when...
You have a little piece of high-tech in your chest.
This is my second Christmas with my pacemaker and I am so happy to be with my family.