A 6-year-old child with Ebstein anomaly undergoes cardiac evaluation. The hallmark ECG finding in Ebstein anomaly that distinguishes it from most other CHDs is:
- A Wolff-Parkinson-White pattern (delta waves), especially right-sided accessory pathway ✓
- B Right bundle branch block with left axis deviation
- C Peaked P waves with prolonged PR interval
- D Complete heart block
Correct answer: A. Wolff-Parkinson-White pattern (delta waves), especially right-sided accessory pathway
Explanation
Ebstein anomaly (apical displacement of the tricuspid valve) is uniquely associated with Wolff-Parkinson-White syndrome in approximately 20–25% of cases, predominantly with right-sided (type B) accessory pathways due to accessory connections forming near the abnormal tricuspid annulus. The characteristic ECG shows a short PR, delta wave, and broad QRS. Right bundle branch block is common but less distinctive. Complete heart block is not a feature of Ebstein anomaly.
Reference: Ghai Essential Pediatrics, 10th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.