In a patient with a small interatrial shunt (bubble study showing 2‑4 bubbles), normal left ventricular ejection fraction, mild left ventricular hypertrophy, normal right ventricular size and function, mild aortic regurgitation, a 5 mm fibroelastoma on the aortic valve, borderline ascending‑aorta dilation, and trivial pericardial effusion, should a percutaneous closure device be placed to close the shunt?

Do Not Place a Closure Device for This Small Interatrial Shunt

This patient does not meet criteria for percutaneous closure device placement based on current guidelines. The shunt is hemodynamically insignificant (only 2-4 bubbles), there is no RV enlargement, and no history of cryptogenic stroke or paradoxical embolism is mentioned 1.

Key Decision Points

Why Closure is NOT Indicated

Hemodynamic Insignificance:

• The 2022 Canadian Cardiovascular Society guidelines require either RV enlargement OR Qp:Qs ≥1.5 for closure consideration 1
• Your patient has normal RV chamber dimension and normal RV systolic function
• A shunt with only 2-4 bubbles represents a very small communication, far below the threshold for hemodynamic significance
• Guidelines define large shunts as >30 microbubbles (CLOSE trial) or >25 microbubbles (REDUCE trial) 2

No Stroke History:

• PFO/ASD closure for secondary stroke prevention requires documented cryptogenic stroke or TIA with no other identifiable cause 2, 3
• The patient must be ≤60 years old with high-risk features (atrial septal aneurysm or large shunt) 2, 3
• Your case mentions no stroke history

The Fibroelastoma Consideration

The 5mm aortic valve fibroelastoma is a separate issue requiring its own evaluation:

• This is a potential embolic source independent of the shunt
• Surgical excision may be considered if symptomatic embolic events occur
• The presence of fibroelastoma does NOT change the indication for shunt closure

What This Patient Needs

Conservative Management:

• Antiplatelet therapy if indicated for other cardiovascular risk factors
• Echocardiographic surveillance every 2-3 years to assess for RV enlargement or increased shunt 4
• Monitor for development of symptoms, arrhythmias, or paradoxical embolic events 4
• Address the fibroelastoma separately with cardiology/cardiac surgery consultation

Referral to Adult Congenital Heart Disease (ACHD) specialist for at least one evaluation is warranted given the documented shunt, even if small 1

Common Pitfalls to Avoid

1. Do not close small shunts prophylactically - The procedural risks (atrial fibrillation 4.6-6.6%, device-related complications) outweigh benefits when there's no hemodynamic significance or stroke history 2

2. Do not confuse PFO with ASD - While both are interatrial communications, management algorithms differ slightly. Your bubble study suggests PFO given the small number of bubbles

3. Do not attribute every cardiac finding to the shunt - The mild LV hypertrophy, mild AR, and borderline aortic dilation are unrelated to this small shunt and require separate evaluation

4. Watch for changing hemodynamics - If the patient develops hypertension, coronary disease, or acquired valvular disease, these can increase left-to-right shunting and potentially make the defect hemodynamically significant 4

The evidence is clear: closure is only indicated for hemodynamically significant shunts (RV enlargement/Qp:Qs ≥1.5) or for secondary stroke prevention in carefully selected patients 1, 3. This patient meets neither criterion.