Atrial Septal Defect Management
Primary Treatment Recommendations
- The American Heart Association recommends closure of hemodynamically significant ASDs, with percutaneous device closure preferred for secundum defects and surgical closure required for all other anatomic subtypes, regardless of symptoms 1, 2, 3
- The American College of Cardiology indicates that percutaneous device closure is first-line treatment for secundum ASDs with right atrial and RV enlargement, with or without symptoms 1, 2, 4
Treatment Algorithm by ASD Type and Clinical Scenario
- For secundum ASDs, percutaneous device closure is indicated when right atrial and RV enlargement are present, with or without symptoms, according to the American Heart Association 1, 2, 4
- Surgical closure is a reasonable alternative for secundum ASDs when concomitant tricuspid valve repair/replacement is needed or anatomy precludes percutaneous device use, as recommended by the American College of Cardiology 1, 2
- For non-secundum ASDs, surgical closure is mandatory, as stated by the American Heart Association 1, 2, 4
Specific Clinical Indications for Closure
- The American College of Cardiology recommends closure for patients with right atrial and RV enlargement with or without symptoms, with a class I indication 1, 2, 3
- Closure is also recommended for patients with Qp:Qs ≥1.5:1 with RV enlargement, with a class I indication 3, 4
Critical Hemodynamic Thresholds and Contraindications
- The American Heart Association states that severe irreversible PAH with no evidence of left-to-right shunt is an absolute contraindication for closure, with a class III indication 1, 2
- PA systolic pressure >2/3 systemic and PVR >2/3 systemic resistance are also absolute contraindications, according to the American College of Cardiology 3
Special Considerations and Adjunctive Therapies
- The American Heart Association recommends treating atrial arrhythmias to restore and maintain sinus rhythm, with anticoagulation required for atrial fibrillation 2
- Pre-closure ablation is reasonable for patients with supraventricular tachycardia undergoing ASD closure, as stated by the American College of Cardiology 5
Critical Pitfalls to Avoid
- The American College of Cardiology warns against assuming small shunts are benign in older adults, as acquired conditions can increase left-to-right shunting over time, making previously insignificant ASDs hemodynamically relevant 3
- Severe PAH should always be excluded before closure, as closure with established severe pulmonary vascular disease is fatal, according to the American Heart Association 3
Management of Ostium Secundum Atrial Septal Defects
Initial Hemodynamic Assessment Required
- The American College of Cardiology recommends that pulmonary artery systolic pressure should be less than 50% of systemic pressure for a Class I indication of ASD closure, and pulmonary vascular resistance should be less than 1/3 of systemic resistance, with a Qp:Qs ratio of ≥1.5:1 to confirm a hemodynamically significant shunt, in patients with ostium secundum ASD, including those with deficient aortic and posterior rims 6, 7
- Cardiac catheterization is a reasonable approach to assess pulmonary artery systolic pressure, pulmonary vascular resistance, and other hemodynamic parameters definitively, particularly in older adults with potential pulmonary hypertension 8
Surgical Management Strategy
- The American College of Cardiology recommends surgical patch closure via sternotomy as the definitive treatment for ostium secundum ASD with deficient aortic and posterior rims, including patch closure of the secundum ASD using pericardial or synthetic patch material, intraoperative assessment of pulmonary venous connections, and evaluation for concomitant tricuspid valve pathology 6, 7
- The American College of Cardiology suggests that surgery should be performed by a surgeon with expertise in adult congenital heart disease, although the specific citation for this is not provided, the general principle is supported by 6, 7