Have done many over the past 25 years (we call them ECGs over here). All were normal. One suggested that I may have MVP (Mitral Valve Prolapse) at the age of 18

Have done many over the past 25 years (we call them ECGs over here). All were normal. One suggested that I may have MVP (Mitral Valve Prolapse) at the age of 18, which I thought was the cause. But then more resent scans confirm that I don't suffer from MVP.