# The patient's ECG reveals ______ block, with P waves present but no corresponding QRS complexes.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=168383  
> language: ko  
> subject: Diseases of the circulatory system

## 문제

The patient's ECG reveals ______ block, with P waves present but no corresponding QRS complexes.

## 보기

1. complete **✔ 정답**
2. partial
3. bundle
4. cardiac
5. conduction

**정답: 1**

## 해설

Complete heart block (third-degree AV block) is characterized by a complete dissociation between atrial and ventricular activity. P waves are present but have no relationship to QRS complexes, as the electrical signal cannot pass through the AV node.

## 임상 시나리오

• Complete Heart Block (Third-degree AV Block)
- Complete dissociation between atrial and ventricular activity
- P waves present with no relationship to QRS complexes
- Independent atrial and ventricular rates
- Regular P waves but slower QRS rhythm
- Ventricular escape rhythm takes over
- AV conduction ratio not fixed
- High risk of cardiac arrest
- Common causes: myocardial infarction, fibrosis, medications
- Treatment often requires permanent pacemaker
- Emergency intervention may be necessary
- Symptoms: dizziness, syncope, fatigue
- Bradycardia usually present
- Can be congenital or acquired
- Requires continuous monitoring
- ECG shows AV dissociation
- May progress from lower-degree blocks
- Associated with poor prognosis if untreated
- Regular but slow ventricular rate
- Hemodynamic compromise possible

## 핵심 개념

- **complete** — Total or absolute interruption of electrical conduction between the atria and ventricles in the heart
- **partial** — Incomplete or limited blockage of electrical signals in the heart's conduction system
- **bundle** — A group of specialized cardiac muscle fibers that conduct electrical impulses in the heart
- **cardiac** — Relating to or situated near the heart
- **conduction** — The transmission of electrical impulses through the heart's specialized conducting system

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