An extremely low body temperature can cause the heart to beat so slowly that a pulse may be difficult to find.

VOA: special.2009.12.30

The devices are connected to a piece of equipment called a pulse generator.

VOA: special.2009.04.07

"The guitar,you know, pushes the whole thing. It's like a pulse,you know, they call it 'the pump'.

VOA: standard.2009.12.19