A 52-year-old woman with diabetes mellitus type 2 and a prior anterior wall myocardial infarction 3 years ago now presents with signs of decompensated heart failure. What is the most common site of left ventricular wall motion abnormality in her condition?

Question

Accepted Answer

D. Anterior wall and apex. ## Most Common Site of LV Wall Motion Abnormality in Ischemic Cardiomyopathy

### Coronary Artery Supply and Infarction Patterns

**Key Point:** The **left anterior descending (LAD) artery** is the most frequently occluded vessel in acute MI, accounting for 40–50% of all acute coronary events. LAD occlusion causes anterior wall and apical infarction.

### Coronary Anatomy and Territory

| Artery | Territory | Wall Affected | Frequency of Occlusion (%) |
|--------|-----------|---|---|
| **LAD** | **Anterior, apex, septum** | **Anterior + apex** | **40–50** |
| RCA | Inferior, RV | Inferior | 30–40 |
| LCx | Lateral, posterior | Lateral | 15–25 |
| LM | Entire LV | Diffuse | 5–10 |

**High-Yield:** The LAD is the longest and most dominant coronary artery; it supplies the largest territory of the left ventricle. Anterior wall MI (especially with apical involvement) results in the largest infarct size and greatest loss of contractile function.

### Mechanism of LV Dysfunction in Ischemic Cardiomyopathy

1. **Acute phase**: Myocardial necrosis in LAD territory (anterior wall + apex)
2. **Remodeling phase** (weeks to months): Ventricular dilatation, thinning of infarcted segment
3. **Chronic phase** (years): Scar formation, global systolic dysfunction, HF develops

**Clinical Pearl:** Anterior wall MI with apical involvement carries the worst prognosis among all MI locations because:
- Largest infarct size (LAD supplies ~40% of LV mass)
- Greatest loss of contractile function
- Highest risk of mechanical complications (VSD, papillary muscle rupture)
- Highest incidence of post-MI HF

**Mnemonic: LAD = Largest Area Damaged**
- Supplies the longest artery
- Largest territory
- Largest infarcts
- Largest functional loss

### Echocardiographic Finding

Wall motion abnormality in anterior wall and apex appears as:
- **Hypokinesis** (reduced contraction) or **akinesis** (no contraction) in systole
- Apical ballooning in severe cases
- Global EF reduction due to loss of anterior/apical contribution

[cite:Harrison 21e Ch 295, Robbins 10e Ch 12]

Answer

A. Inferior wall

Answer

B. Posterior wall

Answer

C. Lateral wall

A 52-year-old woman with diabetes mellitus type 2 and a prior anterior wall myocardial infarction 3 years ago now presents with signs of decompensated heart failure. What is the most common site of left ventricular wall motion abnormality in her condition?

Explanation

Most Common Site of LV Wall Motion Abnormality in Ischemic Cardiomyopathy

Coronary Artery Supply and Infarction Patterns

Coronary Anatomy and Territory

Mechanism of LV Dysfunction in Ischemic Cardiomyopathy

Echocardiographic Finding

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Artery	Territory	Wall Affected	Frequency of Occlusion (%)
LAD	Anterior, apex, septum	Anterior + apex	40–50
RCA	Inferior, RV	Inferior	30–40
LCx	Lateral, posterior	Lateral	15–25
LM	Entire LV	Diffuse	5–10