I've had PVCs for many years in the past few months they have been everyday an lasting longer. Also noticed another irregular feeling of my heart slowing down. I experienced lightheadedness, coughing an shortness of breath. Had all the test. EKG,Echocardiogram, stress test and Holter Monitor 24 hours. I know what all the findings mean except this one.Rare STS coupiel and one burst of 5 beats in length. My Cardiologist Said everything is normal.