Left Ventricle Underdevelopment Reduces Aortic Flow

Steps:

• Hypoplastic left heart syndrome impairs the left ventricle's ability to pump oxygenated blood.
• The left ventricle normally ejects blood into the aorta for systemic circulation.
• Underdevelopment limits output, causing reduced flow in the aorta.
• Pulmonary circulation remains relatively intact via the right ventricle.

Why A is correct:

• The aorta is the primary vessel receiving blood from the left ventricle, so hypoplasia directly decreases its flow per cardiac output principles.

Why the others are wrong:

• B: Pulmonary artery flow depends on right ventricular output, which is unaffected.
• C: Pulmonary vein carries blood to the left atrium, upstream of the defective ventricle.
• D: Vena cava delivers venous return to the right atrium, not impacted by left heart issues.

Final answer: A