| The darkness of winter slows the city's heartbeat, making our every action or movement an effort. |
| Her heartbeat quickens when the footsteps suddenly stop, and the door to the bedroom opens and closes. |
| If it detects an abnormally rapid heartbeat, it sends an electrical surge to a defibrillator coil and jolts the heart back into a normal rhythm. |
| If there was a school for witchcraft and wizardry, I'd sign up in a heartbeat. |
| There was that strange, high pitched tune playing somewhere beyond his right ear, accompanying the double thump of his heartbeat. |
| However, investigations later showed it was only an increased heartbeat which is less serious than first thought. |
