ECG RHYTHM LAB

Sinus Bradycardia

Sinus rhythm with a rate below 60 beats per minute.

Generated six-second Lead II example · 48 bpm target rate · not a patient recording.

Typical rate

<60 bpm

Regularity

Regular

P waves

Upright; one before each QRS

PR interval

120–200 ms; constant

QRS

Narrow, <120 ms

What to look for

The sinus pattern is preserved; the R–R intervals are longer.

Show this rhythm

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