2d echo and holter monitor hospital in yelahanka... Holter Monitor... This portable device records the rhythm of your heart. If your doctor thinks there's a problem, he might ask you to wear the monitor for a day or two. It tracks the electrical activity nonstop (unlike an ECG, which is a snapshot in time). Your doctor will probably ask you to log your activities and symptoms, too. So Doctor can find out your heart rhythm are normal or abnormal .... so holter monitor is important test for your heart rhythm ... Take care of your heart ...