Palpitations
Depending on the individual's age and level of fitness, the heart beats (on average) between 60 and 100 times every minute. Almost everyone experiences a palpitation occasionally. This may be the result of a very brief period of irregular heart beat. This type of heart arrhythmia typically feels like a skipped beat, followed by a heavy thud.
The occasional palpitation is nothing to worry about, but consistent irregularities of the heart beat should be investigated by a doctor.