# A client has palpitations and an irregularly irregular rhythm. Click the rhythm-strip feature that best supports atrial fibrillation.

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> subject: System-Specific Assessments  
> category: ROR

## Question

A client has palpitations and an irregularly irregular rhythm. Click the rhythm-strip feature that best supports atrial fibrillation.

![](https://mymerci.kr/data/nclex/hotspot/v2/v2_ecg_afib.png)

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## Explanation

Irregular R-R intervals is the best answer. Atrial fibrillation is characterized by irregularly irregular R-R intervals and absent organized P waves. Other marked areas do not best match the cue in this item.

## In-depth explanation

Quick answer
Irregular R-R intervals is the best answer. Atrial fibrillation is characterized by irregularly irregular R-R intervals and absent organized P waves. Other marked areas do not best match the cue in this item.

Why this is correct
Atrial fibrillation produces disorganized atrial activity and an irregular ventricular response. The varying distance between consecutive R waves is the clearest hotspot evidence of an irregularly irregular rhythm.

Easy analogy or mental picture
Imagine dropping the R waves on a ruler: with atrial fibrillation, the gaps do not repeat in a predictable pattern. This picture describes timing, not the cause of every irregular rhythm.

Memory hook
Atrial fibrillation produces R-R intervals with no repeating pattern.

NCLEX decision rule
When the stem says irregularly irregular, compare several consecutive R-R intervals and also look for the absence of consistent organized P waves.

Why the other choices are wrong
A single ST, QT, or P-wave region cannot by itself demonstrate the changing beat-to-beat ventricular timing requested by the question.References

- [1]American Heart Association: What is atrial fibrillation?

## Clinical scenario

Clinical situation
A client has palpitations and an irregularly irregular rhythm.

What the nurse should notice
Irregular R-R intervals is the best answer. Atrial fibrillation is characterized by irregularly irregular R-R intervals and absent organized P waves. Other marked areas do not best match the cue in this item.

Transfer to practice
When the stem says irregularly irregular, compare several consecutive R-R intervals and also look for the absence of consistent organized P waves.

## Key concepts

- **Atrial fibrillation** — Irregular atrial rhythm.
- **R-R interval** — The time between consecutive ventricular depolarizations on an ECG.
- **P wave** — Atrial depolarization.

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