I am a 25 year old woman. About three months ago, I started having ectopic beats and palpitations. It made me quite worried, because they were definitely something new. I have a family history of sudden death from hypertrophic cardiomyopathy. So, I decided to have an echo and a 24 hour Holter monitor. The echo showed that structurally my heart is fine and according to the Holter monitor results I had dozens of PVCs (some of them were couplets), a few PACs and sinus tachycardia. My blood test results were normal, too. A couple of days later PVCs began to occur not only during rest, but also during exercise, which really scared me. One day while walking home, I had some kind of bigeminy (every other beat was abnormal) that almost took my breath away. Therefore, I wanted to get a stress test on a stationary bicycle just in case. I had some singular PVCs at an intensity level of 120 watts with the heart rate of 164 beats per minute. Is this something to worry about? My cardiologist said that the results do not suggest any heart disease, but I am still afraid to exercise anymore. What about multifocal PVCs, ventricular couplets and bigeminy in a structurally normal heart? Are they dangerous?