Atrial Septal Defect vs Ventricular Septal Defect
Atrial Septal Defect and Ventricular Septal Defect are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Atrial Septal Defect vs Ventricular Septal Defect at a glance
- Atrial Septal Defect: Opening in the interatrial septum producing left-to-right shunt, fixed split S2, and risk of paradoxical embolism.
- Ventricular Septal Defect: Opening in the interventricular septum causing a left-to-right shunt with a harsh holosystolic murmur at the LLSB.
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Side-by-side comparison
| Feature | Atrial Septal Defect | Ventricular Septal Defect |
|---|---|---|
| At a glance | Opening in the interatrial septum producing left-to-right shunt, fixed split S2, and risk of paradoxical embolism. | Opening in the interventricular septum causing a left-to-right shunt with a harsh holosystolic murmur at the LLSB. |
| Classic presentation | Wide and fixed split S2 with pulmonic flow murmur in an otherwise asymptomatic adult.; Often asymptomatic in childhood; diagnosed in adulthood after decades… | Harsh, blowing holosystolic murmur with palpable thrill at the LLSB; intensity inversely related to defect size in many cases.; Small VSD: asymptomatic,… |
| Workup / key labs | Hemodynamically significant ASD warranting closure: right heart enlargement on imaging and Qp/Qs ≥1.5, OR documented paradoxical embolism, OR… | Basic labs are typically normal; BNP if HF symptoms |
| Imaging | Transthoracic echocardiography with agitated saline (bubble study) and color Doppler — visualizes defect, direction and magnitude of shunt, RA/RV size, RV… | Transthoracic echocardiography with color Doppler — diagnostic; defines anatomy, size, shunt direction, chamber size, RV pressure, presence of AR (especially… |
| First-line treatment | Secundum ASD: percutaneous transcatheter device closure (e.g., Amplatzer septal occluder) is the preferred approach when anatomy is suitable (adequate rims,… | Small, restrictive, asymptomatic VSD: observation; spontaneous closure is common in muscular and small perimembranous defects; Hemodynamically significant VSD… |
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