** Shares of medical device maker HeartBeam BEAT.O rise 9.3% to $3.55 in premarket trading

** Company says the U.S. FDA cleared its device that can record the heart's electrical activity and help in detecting irregular heartbeats

** Says the credit card-sized device, when placed on the patient's chest, works by capturing the signals, which are then processed and sent to a physician for review

** Up to last close, stock up 32.8% YTD

(Reporting by Christy Santhosh)

((Christy.Santhosh@thomsonreuters.com))