lol you guys! who cares if its a heart palpitation or a heart attack, I mean all this banter over a silly definition, you guys need to get out more! From what i saw breifly on CNN (yes I know how some of you despise this source, but Dr. Sanjay Gupta seems pretty accurate to me) They were calling it a "silent heart attack" something of how the shot migrated into the muscle lining of the heart causing palpitations and irregular heartbeat. Treatment could be some blood thiners, a shock to "reset" the heart beat or just leaving the stuff in there.
It must have been a slow news day to have such hype over such a thing, but than again everyone knows how the media likes to jump onto things like this.