FREE RCIS Congenital Heart Defects Questions and Answers

Question 1

During a right heart catheterization, a significant 'step-up' in oxygen saturation is noted between the superior vena cava (SVC) and the right atrium (RA). This finding is most indicative of which congenital heart defect?

Accepted Answer

Atrial Septal Defect (ASD)

Answer

A 'step-up' in oxygen saturation from the SVC to the RA signifies the shunting of oxygenated blood from the left atrium to the right atrium. This is the classic hemodynamic finding for an atrial septal defect (ASD). The mixing of oxygenated blood increases the overall oxygen saturation in the right atrium compared to the systemic venous return.

Question 2

A Qp:Qs ratio of 2.5:1 is calculated for a patient with a known congenital defect. This ratio indicates:

Accepted Answer

A significant left-to-right shunt

Answer

The Qp:Qs ratio compares pulmonary blood flow (Qp) to systemic blood flow (Qs). A ratio greater than 1.5:1 is generally considered hemodynamically significant, indicating a substantial left-to-right shunt. A ratio of 2.5:1 means that pulmonary blood flow is 2.5 times greater than systemic blood flow, warranting consideration for defect closure.

Question 3

Which of the following congenital defects results in a direct connection between the aorta and the pulmonary artery, often leading to a continuous 'machinery-like' murmur?

Accepted Answer

Patent Ductus Arteriosus (PDA)

Answer

A Patent Ductus Arteriosus (PDA) is the failure of the fetal ductus arteriosus to close after birth. This vessel connects the descending aorta to the pulmonary artery, causing a continuous left-to-right shunt and a characteristic machinery-like murmur heard on auscultation.

Question 4

Tetralogy of Fallot is a complex cyanotic heart defect characterized by four specific anatomical abnormalities. Which of the following is NOT one of the four classic components of TOF?

Accepted Answer

Atrial Septal Defect (ASD)

Answer

The four classic components of Tetralogy of Fallot are: 1) a large Ventricular Septal Defect (VSD), 2) an overriding aorta that sits over the VSD, 3) right ventricular outflow tract obstruction (pulmonary stenosis), and 4) right ventricular hypertrophy. An Atrial Septal Defect (ASD) is not part of the classic tetralogy, although it can coexist (Pentalogy of Fallot).

Question 5

A patient presents with significantly higher blood pressure in the upper extremities compared to the lower extremities, along with diminished femoral pulses. This clinical presentation is most suggestive of:

Accepted Answer

Coarctation of the Aorta

Answer

Coarctation of the Aorta is a narrowing of the aorta, typically in the descending thoracic aorta near the insertion of the ductus arteriosus. This obstruction leads to hypertension in the arms (proximal to the coarctation) and hypotension with weak pulses in the legs (distal to the coarctation). This pressure differential is a hallmark sign of the condition.

RCIS - Registered Cardiovascular Invasive Specialist Practice Test

RCIS - Registered Cardiovascular Invasive Specialist Practice Test

FREE RCIS Congenital Heart Defects Questions and Answers