Hello. Thank you for your question and welcome to HCM. I understand your concern.
I will start my answer by saying that the normal heart rate, standardized for the population worldwide is 60-100 heart beats per minute. Now, a heart rate of 90 beats per minute is not very high. However, it remains to be understood if this "jumping" of heart rate is regular or irregular rhythm. Therefore, I would recommend an EKG at the moment when this happens, which is not very suitable, since to the time you arrive in a healthcare facility, where EKG is done, it may have passed as an episodes. The remaining option is that you wear a 24-hour rhythm monitor, to assess if these are "attacks" with a regular or
irregular heart rate. Nevertheless, the fact that an extra half tablet of your medication helps your general condition, then you should discuss with your cardiologist regarding the modification of heart rate and blood pressure-lowering medication. In an elderly, there is often a significant replacement of the normal, functional,
sinus node tissue (natural pacemaker of the heart) with an abnormal, non-functional, fibrotic tissue, hence the problems in rhythm and conduction systems. Before further speculating about this heart rate, I would
stress again that you should wear the monitor, and then discuss your cardiology for the treatment strategy you are to follow.
I hope this was of help. Wish you a good health.
Best regards,
Dr. Meriton