I did a 2 week holter and echocardiogram 2 1/2 weeks ago and see the cardiologist Monday. I also monitored my heart rate with a portable pulse ox. My heart rate was in range, and fluctuated normally with activity, but only add high as 114, but couple times, I noticed it drop to 61 then 58 while standing. I'm hoping it was the monitor trying to catch up, as in as error, but I don't know. My heart rate seems low for me, in the mornings 70 high 60's. I just don't feel energetic though and I'm 45 and perfect blood pressure. Can you have an arythmia with a heart rate in range?