| VDD | atrial synchronous ventricular inhibited [pacemaker]; vitamin D-dependent |
|---|---|
| VOO | ventricular asynchronous (competitive, fixed-rate) [pacemaker] |
| VVI | ventricular inhibited [pacemaker]; vocal velocity index |
| VVT | ventricular triggered [pacemaker] |
| WAP | wandering atrial pacemaker |