A ventricular inhibited-demand pacemaker using the Intersociety Commission for Heart Disease Resources (ICHD) code is designated as:

B. VVI.

DISCUSSION: A ventricular inhibited-demand pacemaker using the ICHD code is designated as VVI. As the ICHD code states, the pacemaker senses intrinsic ventricular activity and is inhibited when this activity exceeds the standby or escape rate of the pacemaker. When the intrinsic ventricular rate falls below the escape rate of the pulse generator, the pacemaker begins to function at its programmed rate.