Third-Degree AV Block

Atrial and ventricular activity proceed independently (AV dissociation).

Programmatically generated teaching example. Morphology and supporting values are simplified.

Typical rate: Escape: often 20–60 bpm
Regularity: Atrial and ventricular rhythms independent
P waves: Regular, independent of QRS
PR interval: Variable; no fixed relationship
QRS: Narrow or wide; wide example shown

Sources and review status

This guide uses RhythmDock’s centralized educational definitions. See reference sources and limitations. Published September 13, 2026. Independent medical review is pending; this is not a clinical interpretation tool.