How do I tell AFib from atrial flutter with variable conduction?

Flutter shows organized atrial activity (sawtooth flutter waves) at ~300/min; AFib has chaotic fibrillatory baseline. When in doubt, verify with a 12-lead and your clinician.

Is rapid AFib an emergency?

It can be. Rate, hemodynamic stability, and patient symptoms determine urgency. RN PocketPal does not make that call — your clinical judgment and the team do.

What about new-onset AFib?

New-onset AFib has implications for anticoagulation and cardioversion timing — those are clinician decisions. Notify and document.

Atrial fibrillation — an educational nurse reference.

What AFib looks like on a strip, why the rhythm is irregularly irregular, and what to verify clinically before acting.

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

Rate: variable; ventricular response can be slow, controlled, or rapid
Rhythm: irregularly irregular (no pattern to R-R intervals)
P wave: absent — fibrillatory waves instead
PR interval: not measurable (no P)
QRS: usually narrow unless aberrancy or pre-existing block

Verify with

Calipers: confirm R-R irregularity has no repeating pattern.
Patient's pulse: irregular and often pulse-deficit relative to apex.
Patient's chart: known AFib history vs. new onset.

Who it’s for

For Nurses and nursing students learning rhythm interpretation.

Frequently asked questions

How do I tell AFib from atrial flutter with variable conduction?: Flutter shows organized atrial activity (sawtooth flutter waves) at ~300/min; AFib has chaotic fibrillatory baseline. When in doubt, verify with a 12-lead and your clinician.
Is rapid AFib an emergency?: It can be. Rate, hemodynamic stability, and patient symptoms determine urgency. RN PocketPal does not make that call — your clinical judgment and the team do.
What about new-onset AFib?: New-onset AFib has implications for anticoagulation and cardioversion timing — those are clinician decisions. Notify and document.

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Reviewed by RN PocketPal Clinical Team, RN. Last reviewed May 7, 2026.