Dr Sanjay Gupta - Yorkshire Consultant Cardiologist puts in plain words regarding Palpitations

Heart palpitations are pulses that unexpectedly become more noticeable.
Your heart senses in your throat or neck.
Palpitations might seem alarming, but generally they arebenign and aren't a sign of an issue by means of your heart.

http://derik20115.tumblr.com/post/124252114665/york-consultant-heart-specialist-explains-with