hi there i have felt palpitations for a while now, i have had all the tests done, blood test, ecg 24 hour ecg, x-ray and ultra sound, and they all came back completely healthy, the cardiologist said it was one of the healthiest hearts he had ever heard, but i have just experienced, a kind of flutter/spasm feeling that lasted about 5-secs it was a spasm/flutter feeling followed by two string beats, i was just wondering if this was a common feeling Thank you