# The cardiac monitor shows a ______ rhythm, with P waves visible but varying P-R intervals before each QRS complex.

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> url: https://mymerci.kr/pages/nclex_q.php?qn_id=168393  
> language: ko  
> subject: Diseases of the circulatory system

## 문제

The cardiac monitor shows a ______ rhythm, with P waves visible but varying P-R intervals before each QRS complex.

## 보기

1. Mobitz **✔ 정답**
2. regular
3. junctional
4. sinus
5. wandering

**정답: 1**

## 해설

Mobitz rhythm, specifically Mobitz type I (Wenckebach), is characterized by progressive lengthening of the PR interval until a QRS complex is dropped. This pattern indicates second-degree AV block and results from progressive delay in AV nodal conduction.

## 임상 시나리오

Cardiac Rhythm Abnormalities:

1. Mobitz Type I (Wenckebach):
- Progressive PR interval lengthening
- Dropped QRS complex
- Second-degree AV block
- Normal P waves present
- Irregular ventricular response

2. Mobitz Type II:
- Constant PR intervals
- Sudden dropped QRS complexes
- Higher risk of complete heart block
- Fixed ratio of conducted beats

3. ECG Characteristics:
- P waves: Represent atrial depolarization
- PR interval: Conduction time through AV node
- QRS complex: Ventricular depolarization
- Normal PR interval: 0.12-0.20 seconds

4. Clinical Implications:
- May require pacemaker
- Risk of progression to complete heart block
- Regular monitoring needed
- Common symptoms: dizziness, syncope

## 핵심 개념

- **Mobitz** — A type of second-degree atrioventricular block characterized by progressive lengthening of PR intervals before a dropped QRS complex
- **regular** — Having a consistent and uniform pattern in cardiac rhythm with equal intervals between beats
- **junctional** — A cardiac rhythm originating from the AV junction, characterized by absent or inverted P waves
- **sinus** — Normal heart rhythm originating from the sinoatrial node with regular P waves followed by QRS complexes
- **wandering** — A cardiac rhythm characterized by varying P wave morphology and PR intervals due to shifting atrial pacemaker sites

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