I have mild mitral valve prolapse. Have had numerous electrocardiographs, echocardiograms, a stress test, couple of 24 hour monitors. Only thing picked up on ambulatory monitors were premature ventricular contractions. However, when I wasnt wearing the monitor I have had "runs" of missed beats. Also a couple of episodes of runs of misbeats leading to feelings of no blood being pumped to the head, until normal rhythm resumed.