How do I tell junctional rhythm from sinus bradycardia?

Sinus brady keeps the normal upright P → PR → QRS sequence, just slow. A junctional rhythm loses that: the P is inverted, missing, or comes after the QRS because the impulse starts at the AV junction.

Is a junctional escape rhythm dangerous?

A junctional escape is often a protective backup when the sinus node fails. Whether it's adequate depends on the rate and the patient's perfusion — that's a clinical assessment, not an app's call.

What medication is classically associated?

Digoxin toxicity can cause junctional rhythms (and accelerated junctional rhythm). Correlate with the med list and levels; treatment is the clinician's decision.

Junctional rhythm — an educational nurse reference.

When the AV junction takes over: the inverted, absent, or retrograde P wave, and the rates that name the rhythm.

Recognizing this rhythm at the bedside means matching pattern, intervals, and clinical context. This page covers the educational pattern; calipers and your clinical judgment carry it across the line.

What RN PocketPal does

Identifying traits

Pacemaker: the AV junction, not the SA node.
P wave: inverted in lead II, absent, or retrograde (after the QRS).
QRS: usually narrow.
Rate names it: junctional escape 40–60, accelerated junctional 60–100, junctional tachycardia > 100.
Rhythm: usually regular.

Verify with

Look at the P-wave relationship: loss of the normal upright-P-before-QRS is the key clue.
Check for causes: sinus node dysfunction, digoxin effect/toxicity, ischemia of the inferior wall.
Symptoms + the clinical team decide whether the escape rate is adequate or needs support.

Who it’s for

For Nurses and nursing students learning rhythm interpretation.

Frequently asked questions

How do I tell junctional rhythm from sinus bradycardia?: Sinus brady keeps the normal upright P → PR → QRS sequence, just slow. A junctional rhythm loses that: the P is inverted, missing, or comes after the QRS because the impulse starts at the AV junction.
Is a junctional escape rhythm dangerous?: A junctional escape is often a protective backup when the sinus node fails. Whether it's adequate depends on the rate and the patient's perfusion — that's a clinical assessment, not an app's call.
What medication is classically associated?: Digoxin toxicity can cause junctional rhythms (and accelerated junctional rhythm). Correlate with the med list and levels; treatment is the clinician's decision.

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Reviewed by RN PocketPal Clinical Team, RN. Last reviewed June 4, 2026.