Cardiology MCQ: When a magnet is applied to a VVI pacemaker, it reverts to:

When a magnet is applied to a VVI pacemaker, it reverts to:

a) VOO mode
b) VTT mode
c) No effect
d) None of the above

Answer: a) VOO mode

Pacemaker sensing function is switched off by the activation of a reed switch when the magnet is applied.