# The ECG reveals a ______ pattern, with each P wave followed by progressively longer PR intervals until a QRS complex is dropped.

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> url: https://mymerci.kr/pages/nclex_q.php?qn_id=168403  
> language: ko  
> subject: Diseases of the circulatory system

## 문제

The ECG reveals a ______ pattern, with each P wave followed by progressively longer PR intervals until a QRS complex is dropped.

## 보기

1. Wenckebach **✔ 정답**
2. Mobitz
3. sequential
4. progressive
5. gradual

**정답: 1**

## 해설

The Wenckebach pattern (Mobitz type I AV block) shows progressive lengthening of the PR interval until a QRS complex is dropped. This occurs due to gradually increasing conduction delay in the AV node, resulting in a missed ventricular beat.

## 임상 시나리오

ECG Wenckebach Pattern (Mobitz Type I AV Block)

1. Key Characteristics:
- Progressive lengthening of PR intervals
- Dropped QRS complex
- Regular P waves
- Irregular R-R intervals

2. Diagnostic Criteria:
- PR interval gradually increases
- QRS complex eventually drops
- Pattern repeats cyclically
- Group beating phenomenon

3. Clinical Features:
- Usually benign condition
- Common in young, healthy individuals
- Often asymptomatic
- May occur during sleep/increased vagal tone

4. Conduction Abnormalities:
- AV node dysfunction
- Progressive conduction delay
- Intermittent block
- Normal QRS morphology

5. Treatment Considerations:
- Often requires no treatment
- Monitor for progression
- Reversible causes assessment
- Medication adjustment if symptomatic

## 핵심 개념

- **Wenckebach** — A specific type of heart block (Mobitz type I) characterized by progressive lengthening of PR intervals until a QRS complex is dropped
- **Mobitz** — A classification system for atrioventricular blocks, describing specific patterns of cardiac conduction abnormalities
- **sequential** — Following a regular or predictable order or pattern, occurring in succession
- **progressive** — Advancing or developing gradually in stages, showing continuous increase or development
- **gradual** — Taking place or progressing slowly by degrees, occurring in a step-by-step manner

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