# The ECG shows ______ complexes in leads V1-V2, suggesting right ventricular hypertrophy.

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> url: https://mymerci.kr/pages/nclex_q.php?qn_id=168406  
> language: ko  
> subject: Diseases of the circulatory system

## 문제

The ECG shows ______ complexes in leads V1-V2, suggesting right ventricular hypertrophy.

## 보기

1. dominant-R **✔ 정답**
2. rSR
3. QRS
4. wide
5. tall

**정답: 1**

## 해설

Dominant-R wave complexes in right precordial leads (V1-V2) are a key ECG finding in right ventricular hypertrophy. This pattern occurs due to increased right ventricular muscle mass, altering the normal electrical forces in these leads.

## 임상 시나리오

ECG Findings in Right Ventricular Hypertrophy (RVH):

1. R wave amplitude in V1 > 6mm
2. R/S ratio in V1 > 1.0
3. Right axis deviation > 110 degrees
4. Deep S waves in leads I and V6
5. ST depression and T wave inversion in right precordial leads
6. QR pattern in V1
7. Increased R wave amplitude in aVR
8. P pulmonale (tall, peaked P waves in II, III, aVF)
9. Incomplete or complete right bundle branch block pattern
10. Transition zone shift to the left
11. Secondary repolarization changes
12. R wave peak time in V1 > 0.035 seconds

Common Causes of RVH:
1. Pulmonary hypertension
2. Congenital heart disease
3. Chronic lung disease
4. Pulmonary embolism
5. Mitral stenosis
6. Cor pulmonale

## 핵심 개념

- **dominant-R** — A prominent R wave that is larger than other waves in the QRS complex, typically seen in ECG leads
- **rSR** — A pattern in ECG showing a small r wave, followed by an S wave, and then a larger R wave, forming an M-shaped complex
- **QRS** — The combination of three graphical deflections on an ECG representing ventricular depolarization
- **wide** — Having a greater than normal duration or breadth when referring to ECG wave complexes
- **tall** — Having greater than normal amplitude or height when referring to ECG wave complexes

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