Hi, My father is having hypertension from last 8-9 years and ckd from last 3-4 years. He is taking aten 50 from long time. His heart rate most of the time are below 70..however from last few days it's between 55 to 65..today it's around 55-57..so is it need to be worry or it's normal... Today we have not given aten 50. Few days back done ECG.. Doc say some st abnormalities but nothing to worry. Anything we can do to keep heart rate in desire range