Palpitation: A premature ventricular contraction (PVC) or premature atrial contraction (PAC). Sometimes a healthy heart has an early beat - that beat resets the timer and a normal beat follows. That sensation is often described as a flip flop. Sometimes a few in a row can give you a real start, but they are benign unless accompanied by other serious signs or symptoms.
Answered 6/20/2014
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