The left anterior descending artery supplies which myocardial segments?

• A. Anterior, septal, apical segments
• B. Inferior, basal septal segments
• C. Lateral segments
• D. Posterior wall segments

Answer: (A)

The left anterior descending artery travels in the anterior interventricular groove and supplies the front wall of the left ventricle, most of the interventricular septum, and the apex. Because of this distribution, the myocardial segments fed by the LAD are the anterior wall, the septal regions, and the apical region. Regions like the inferior and basal septal areas, the lateral wall, and the posterior wall are supplied mainly by other arteries (the right coronary artery/PDA for inferior/posterior regions and the left circumflex for the lateral wall).