Ventricular septal defect is classified as which type of congenital heart defect?

Ventricular septal defect is classified as which type of congenital heart defect?

• A. Acyanotic congenital heart defect
• B. Cyanotic congenital heart defect
• C. Obstructive renal anomaly
• D. Pulmonary vascular malformation

Answer: (A)

The key idea is how defects are grouped by their effect on oxygenation. A ventricular septal defect is a hole between the ventricles that creates a left-to-right shunt. Blood from the left ventricle, which is oxygenated, flows into the right ventricle and then to the lungs, increasing pulmonary blood flow. However, the oxygen content of blood reaching the systemic circulation remains normal, so there is no cyanosis. This makes it an acyanotic congenital heart defect. Cyanotic defects involve a right-to-left shunt or mixing that lowers systemic oxygen saturation and causes cyanosis. VSD can become cyanotic only later if the shunt reverses (Eisenmenger syndrome) after longstanding high pulmonary vascular resistance. The other options don’t describe a heart defect in this context: an obstructive renal anomaly is a kidney issue, and a pulmonary vascular malformation isn’t a standard congenital heart defect classification by cyanosis status.

The key idea is how defects are grouped by their effect on oxygenation. A ventricular septal defect is a hole between the ventricles that creates a left-to-right shunt. Blood from the left ventricle, which is oxygenated, flows into the right ventricle and then to the lungs, increasing pulmonary blood flow. However, the oxygen content of blood reaching the systemic circulation remains normal, so there is no cyanosis. This makes it an acyanotic congenital heart defect. Cyanotic defects involve a right-to-left shunt or mixing that lowers systemic oxygen saturation and causes cyanosis. VSD can become cyanotic only later if the shunt reverses (Eisenmenger syndrome) after longstanding high pulmonary vascular resistance. The other options don’t describe a heart defect in this context: an obstructive renal anomaly is a kidney issue, and a pulmonary vascular malformation isn’t a standard congenital heart defect classification by cyanosis status.