# The ECG shows characteristic ______ segments in leads II, III, and aVF, suggesting inferior wall ischemia.

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> url: https://mymerci.kr/pages/nclex_q.php?qn_id=168412  
> language: ko  
> subject: Diseases of the circulatory system

## 문제

The ECG shows characteristic ______ segments in leads II, III, and aVF, suggesting inferior wall ischemia.

## 보기

1. depressed **✔ 정답**
2. elevated
3. horizontal
4. sloping
5. curved

**정답: 1**

## 해설

Depressed ST segments in the inferior leads (II, III, aVF) are characteristic of inferior wall ischemia. This ECG finding indicates reduced blood flow to the inferior wall of the heart, often due to right coronary artery disease.

## 임상 시나리오

ECG ST Segment Analysis:
- ST depression: indicates subendocardial ischemia
- ST elevation: indicates transmural injury/infarction
- Reciprocal changes: opposite ST changes in anatomically opposite leads
- Lead mapping for inferior wall:
* Leads II, III, aVF reflect inferior wall
* Right coronary artery (RCA) supplies inferior wall
- Ischemia patterns:
* Horizontal ST depression: classic ischemia
* Downsloping ST depression: severe ischemia
* Upsloping ST depression: less specific
- Associated findings:
* T wave inversion may accompany ST depression
* Q waves indicate previous infarction
* R wave progression changes in V1-V6

## 핵심 개념

- **depressed** — lowered or pushed downward from normal baseline level on ECG tracing
- **elevated** — raised or lifted upward from normal baseline level on ECG tracing
- **horizontal** — parallel to baseline, forming a flat line on ECG tracing
- **sloping** — angled or inclined either upward or downward on ECG tracing
- **curved** — forming a rounded or arc-shaped pattern on ECG tracing

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