# The cardiac monitoring shows ______ complexes, with QRS duration >0.12 seconds and right bundle branch block pattern.

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> url: https://mymerci.kr/pages/nclex_q.php?qn_id=168430  
> language: ko  
> subject: Diseases of the circulatory system

## 문제

The cardiac monitoring shows ______ complexes, with QRS duration >0.12 seconds and right bundle branch block pattern.

## 보기

1. widened **✔ 정답**
2. narrow
3. normal
4. shortened
5. split

**정답: 1**

## 해설

Widened QRS complexes (>0.12 seconds) with a right bundle branch block pattern indicate delayed conduction through the right ventricle. This occurs when the right bundle branch is damaged or blocked, forcing electrical activation to reach the right ventricle through alternative pathways.

## 임상 시나리오

QRS Complex Characteristics:
- Normal QRS duration: 0.08-0.12 seconds
- Widened QRS: >0.12 seconds
- RBBB criteria: QRS >0.12s, RSR' in V1-V2, Wide S wave in I and V6
- LBBB criteria: QRS >0.12s, Broad R wave in I, V5-V6, QS or rS in V1
- Causes of wide QRS:
* Bundle branch blocks
* Ventricular rhythms
* Hyperkalemia
* Sodium channel blockade
- ECG measurements:
* PR interval: 0.12-0.20s
* QT interval:

## 핵심 개념

- **widened** — Increased in width or duration, typically referring to expanded or broadened waveforms in cardiac monitoring
- **narrow** — Having a reduced width or duration, describing compressed or thin waveforms in ECG patterns
- **normal** — Within standard or typical range for cardiac waveform measurements, showing no pathological changes
- **shortened** — Reduced in duration or length, indicating decreased time intervals in cardiac conduction
- **split** — Divided or separated into two components, referring to cardiac waveforms that show a separation or division

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