ECG in Congenital Heart Disease
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Secundum atrial septal defect
- Rhythm: normal sinus rhythm, increased risk of AF with age
- PR interval: first degree AV block in 6-19%
- QRS axis: 0° to 180°; RAD; LAD in Holt-Oram or LAHB
- QRS Configuration: rSr´ or rsR´ with RBBBi>RBBBc
- Atrial Enlargement: RAE 35%
- Ventricular hypertrophy: Uncommon
- Particularities: "Crochetage" pattern