ECG RHYTHM LAB

Sinus Rhythm with PVCs

Premature ventricular beats interrupt an underlying sinus rhythm.

Generated six-second Lead II example · 72 bpm target rate · not a patient recording.

Typical rate

Underlying sinus rate varies

Regularity

Interrupted by premature beats

P waves

Absent before the PVC

PR interval

Not applicable to PVC

QRS

PVC is wide, ≥120 ms

What to look for

Find an early, wide complex with a different shape and a following pause.

Show this rhythm

Sources and limitations