ECG RHYTHM LAB

Third-Degree AV Block · Wide Escape

Atrial and ventricular activity proceed independently (AV dissociation).

Generated six-second Lead II example · 36 bpm target rate · not a patient recording.

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

What to look for

P waves march through the slower ventricular rhythm without a fixed PR.

Show this rhythm

Sources and limitations