I HAVE AN IRREGULAR HEART RATE TOO. IT DOES NOT TAKE YOUR BLOOD PRESSURE. IT HAS SO FAR GIVEN ME ACCURATE HEART RATE READINGS. I LOVE THIS BECAUSE IT HELPS ME REGULATE MY MEDICINE FOR HEART RATE CONTROL. ALONG WITH THIS GARMIN, I HAVE A SEPARATE BLOOD PRESSURE MONITOR AND A KARDIA MOBILE DEVICE TO RECORD MY HEART RATE DAILY. THE GARMIN ALSO RECORDS YOUR STEPS AND SLEEP, WHICH BOTH HELPS WHEN TRYING TO HELP PEOPLE MANAGE IRREGULAR HEART RATES.