, and look at the definition, you'll see a part that most people forget about, or maybe never realize. Palpitations
are the SENSATION of irregular OR FORCEFUL beating of the heart
. Notice the word "or". Palpitations by definition are not necessarily caused by irregular, extra beats. Everyone associates them with PVCs, but that's not always the case. Normal, sinus rhythm beats can produce palpitations. Read up on palpitations.