Modes of Permanent Pacemaker

Designated by 3-5 letters representing: I - Chambers placed: O (None), A (atrial), V (ventricle), D (dual) II - Chambers sensed: O (None), A (atrial), V (ventricle), D (dual) III - Response to sensing: O (None), T (trigger), I (inhibit), D (dual) IV - Rate modulation: O (none), R (rate modulating) V- whether pacemaker is multisite: in both atria, both ventricles or >1 pacing lead in a single chamber