# The ECG reveals characteristic ______ wave changes in the lateral leads, suggesting posterior wall ischemia.

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> url: https://mymerci.kr/pages/nclex_q.php?qn_id=168427  
> language: ko  
> subject: Diseases of the circulatory system

## 문제

The ECG reveals characteristic ______ wave changes in the lateral leads, suggesting posterior wall ischemia.

## 보기

1. reciprocal **✔ 정답**
2. primary
3. secondary
4. direct
5. mirror

**정답: 1**

## 해설

Reciprocal changes in the lateral leads are commonly seen with posterior wall ischemia. These changes represent the electrical forces viewed from the opposite side of the heart, helping to confirm the diagnosis of posterior wall involvement.

## 임상 시나리오

ECG Interpretation - Reciprocal Changes:

1. Definition:
- Reciprocal changes: opposite electrical patterns seen in leads facing away from the affected area
- Mirror image changes of primary ECG abnormalities

2. Key Characteristics:
- ST depression in anterior leads (V1-V3) = posterior wall MI
- ST elevation in inferior leads = reciprocal ST depression in aVL
- ST depression in lateral leads = posterior wall ischemia

3. Clinical Significance:
- Diagnostic value in confirming acute MI
- Helps localize infarct location
- Indicates extent of myocardial damage

4. Common Patterns:
- Anterior MI: reciprocal changes in inferior leads
- Inferior MI: reciprocal changes in aVL, I
- Posterior MI: reciprocal changes in V1-V3

5. Technical Aspects:
- 12-lead ECG interpretation required
- Mirror-image relationship between leads
- Vector concepts in ECG analysis

## 핵심 개념

- **reciprocal** — Referring to corresponding opposite changes in ECG leads that reflect electrical activity from the opposite side of the heart
- **primary** — First or main changes directly observed in the affected area of the heart
- **secondary** — Changes that occur as a consequence of or following primary changes
- **direct** — Immediate or straightforward changes seen in leads directly overlying the affected area
- **mirror** — Changes that appear as reversed or opposite patterns compared to the original electrical activity

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