All of the following statements regarding total anomalous pulmonary connection are true except:
**Core Concept**
Total Anomalous Pulmonary Connection (TAPC) is a congenital heart defect where the pulmonary artery is connected to the systemic venous system, bypassing the right heart. This results in a mixing of oxygenated and deoxygenated blood, leading to cyanosis and potential cardiovascular collapse. TAPC is classified into different types based on the location and type of connection.
**Why the Correct Answer is Right**
TAPC is characterized by a connection between the pulmonary artery and the systemic venous system, which can be supracardiac, cardiac, infracardiac, or mixed. The supracardiac type is the most common, where the pulmonary artery connects to the superior vena cava, either directly or through an anomalous vessel. The cardiac type involves a connection between the pulmonary artery and the coronary sinus or the right atrium. Infracardiac TAPC involves a connection to the inferior vena cava. Each type of TAPC has a distinct clinical presentation and management plan.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because TAPC is characterized by a connection between the pulmonary artery and the systemic venous system, not between the aorta and the pulmonary artery.
**Option B:** This option is incorrect because TAPC is a cyanotic congenital heart defect, not an acyanotic one. The mixing of oxygenated and deoxygenated blood leads to cyanosis.
**Option C:** This option is incorrect because TAPC is not a type of ventricular septal defect (VSD). While VSDs can be associated with other congenital heart defects, TAPC is a distinct entity.
**Clinical Pearl / High-Yield Fact**
TAPC is a potentially life-threatening condition that requires prompt diagnosis and treatment. The clinical presentation of TAPC can vary depending on the type and severity of the connection, but it often includes cyanosis, tachypnea, and failure to thrive.
**Correct Answer: C. TAPC is a type of ventricular septal defect (VSD).**