CET Pediatric ECG Considerations 2

Question 1

A 6-month-old infant's ECG shows right axis deviation. This finding is considered:

Accepted Answer

Normal for this age due to right ventricular dominance

Answer

Right axis deviation is normal in infants due to right ventricular dominance, which persists until the left ventricle gradually takes over in early childhood.

Question 2

When performing an ECG on a crying infant, the technician should FIRST:

Accepted Answer

Attempt to calm the infant before recording

Answer

Muscle artifact from crying significantly degrades ECG quality, so calming the infant first—using a pacifier, feeding, or parental soothing—produces a more accurate tracing.

Question 3

The P-wave amplitude in pediatric patients is considered abnormal if it exceeds:

Accepted Answer

2.5 mm

Answer

A P-wave exceeding 2.5 mm in amplitude suggests right atrial enlargement and is abnormal in pediatric patients just as in adults.

Question 4

Which congenital heart defect classically produces a 'dome-shaped' or 'boot-shaped' heart on chest X-ray and right ventricular hypertrophy on ECG?

Accepted Answer

Tetralogy of Fallot

Answer

Tetralogy of Fallot causes right ventricular hypertrophy on ECG and the classic 'boot-shaped' heart (coeur en sabot) on X-ray due to RV enlargement and a small pulmonary artery.

Question 5

In a 10-year-old, the normal PR interval range is approximately:

Accepted Answer

100–200 ms

Answer

The normal PR interval in children aged 10 is approximately 100–200 ms (0.10–0.20 s), similar to adults but with the lower bound reflecting faster conduction.

(CET) Certified Electrocardiogram Technician Practice Test

(CET) Certified Electrocardiogram Technician Practice Test

CET Pediatric ECG Considerations 2