Damage to which area of the heart is most likely to result in severe heart failure when injured?

• A. Inferior wall
• B. Anterior wall
• C. Posterior wall
• D. Lateral wall

Answer: (B)

The main concept is that the amount of heart muscle damaged determines how severe the heart failure will be. The anterior wall of the left ventricle contains a large mass of myocardium and is primarily supplied by the left anterior descending artery. When this area is injured, a large portion of the LV loses contractile function, causing a sudden drop in ejection fraction and a rise in filling pressures. That combination leads to rapid and more severe pump failure, with pulmonary edema and cardiogenic shock risk. In contrast, injuries to other walls often involve less muscle mass or areas that don’t impair LV pumping as much, so while heart failure can occur, it’s typically less severe than with an anterior wall infarct.