NBE Pediatric Echocardiography 4 — Questions and Answers
Question 1: When performing echocardiography on a premature neonate with a hemodynamically significant patent ductus arteriosus (PDA), which finding best indicates left heart volume overload?
- Right atrial enlargement with tricuspid regurgitation
- Elevated LA:Ao ratio greater than 1.4:1 (Correct answer)
- Right ventricular dilation with D-shaped septum
- Increased right ventricular systolic pressure
Correct answer: Elevated LA:Ao ratio greater than 1.4:1
An LA:Ao ratio >1.4:1 indicates left atrial enlargement from increased pulmonary venous return, reflecting significant left heart volume overload from a large left-to-right PDA shunt.
Question 2: A 5-year-old child with a history of repaired tetralogy of Fallot now has significant pulmonary regurgitation. Which echocardiographic parameter is most important to monitor for timing of pulmonary valve replacement?
- Left ventricular ejection fraction
- Right ventricular size and systolic function (including RV volumes by 3D echo or MRI correlation) (Correct answer)
- Pulmonary artery systolic pressure
- Left atrial size
Correct answer: Right ventricular size and systolic function (including RV volumes by 3D echo or MRI correlation)
After TOF repair, progressive right ventricular dilation and dysfunction from pulmonary regurgitation are the primary indications for pulmonary valve replacement; RV size and function are monitored closely.
Question 3: In the subcostal view during pediatric echocardiography, which structure is best visualized to assess situs and atrial morphology?
- Mitral valve chordal attachments
- Relationship of the inferior vena cava and aorta to the spine, and drainage into the right atrium (Correct answer)
- Pulmonary venous connections to the left atrium
- Coronary sinus ostium
Correct answer: Relationship of the inferior vena cava and aorta to the spine, and drainage into the right atrium
The subcostal view allows visualization of the IVC and aorta relative to the spine (IVC right, aorta left = situs solitus) and confirms IVC drainage into the morphologic right atrium.
Question 4: A pediatric patient with Marfan syndrome requires echocardiographic surveillance. Which measurement is the primary focus of aortic root monitoring?
- Aortic valve area by planimetry
- Aortic root diameter at the sinuses of Valsalva with Z-score calculation (Correct answer)
- Ascending aorta velocity by pulsed wave Doppler
- Aortic regurgitation vena contracta width
Correct answer: Aortic root diameter at the sinuses of Valsalva with Z-score calculation
In Marfan syndrome, aortic root dilation at the sinuses of Valsalva is the most common and dangerous manifestation; serial measurement with Z-score normalization guides prophylactic surgery timing.
Question 5: Which echocardiographic finding is most consistent with cardiac tamponade in a child with pericardial effusion?
- Mild right ventricular wall thickening
- Right atrial systolic collapse and right ventricular diastolic collapse with respiratory variation in mitral inflow (Correct answer)
- Left ventricular systolic dysfunction with reduced ejection fraction
- Elevated E/e' ratio without chamber collapse
Correct answer: Right atrial systolic collapse and right ventricular diastolic collapse with respiratory variation in mitral inflow
Tamponade physiology is confirmed by right atrial systolic collapse, right ventricular diastolic collapse, and exaggerated respiratory variation (>25%) in mitral inflow velocity.
Question 6: In a child with heterotaxy syndrome and left isomerism, which cardiac anomaly is most commonly associated?
- D-transposition of the great arteries
- Interruption of the inferior vena cava with azygous continuation (Correct answer)
- Hypoplastic left heart syndrome
- Supracardiac total anomalous pulmonary venous return
Correct answer: Interruption of the inferior vena cava with azygous continuation
Left isomerism (bilateral left-sidedness) is strongly associated with interruption of the IVC with azygous or hemiazygous continuation to the superior vena cava.
Question 7: In a 3-year-old with a muscular ventricular septal defect, which echocardiographic view is most useful for complete visualization of the muscular septum?
- Parasternal long-axis view alone
- Multiple views including apical 4-chamber, parasternal short-axis, and subcostal views (Correct answer)
- Suprasternal notch view
- High right parasternal view
Correct answer: Multiple views including apical 4-chamber, parasternal short-axis, and subcostal views
The muscular septum must be interrogated from multiple windows (apical 4-chamber, parasternal short-axis, subcostal) because defects can be missed if only one view is used.
NBE Pediatric Echocardiography 4
When performing echocardiography on a premature neonate with a hemodynamically significant patent ductus arteriosus (PDA), which finding best indicates left heart volume overload?