Can Atrial Septal Aneurysm Contribute to Migraines?
Yes, atrial septal aneurysm (ASA) is strongly associated with migraine, particularly migraine with aura, and appears to play a pathophysiological role rather than being merely coincidental.
The Evidence for ASA-Migraine Association
The relationship between ASA and migraine is well-established through multiple lines of evidence:
ASA dramatically increases migraine with aura prevalence. The most compelling data shows that isolated ASA occurs in 28.5% of patients with migraine with aura, compared to only 3.6% in migraine without aura and 1.9% in controls 1. When ASA occurs with patent foramen ovale (PFO), the association becomes even stronger—patients with both PFO and ASA have an 18.1% prevalence of migraine with aura versus 6.1% in those without these cardiac anomalies (OR 3.72) 2.
The combination of PFO and ASA matters most. While PFO alone shows inconsistent associations with migraine, the presence of ASA alongside PFO creates a particularly strong relationship with migraine with aura (OR 2.71) 2. This suggests ASA is not simply a bystander but actively contributes to migraine pathophysiology, possibly through enhanced right-to-left shunting or increased embolic potential 3.
Clinical Implications
ASA influences migraine characteristics:
- Earlier disease onset: Patients with right-to-left shunts (often associated with ASA) develop their first migraine with aura attack at significantly younger ages, with greater shunt severity correlating with even earlier onset 4
- Increased ischemic risk: ASA with PFO is associated with higher rates of ischemic brain lesions (11.3% vs 6.2%) and larger shunt sizes 5
- Stronger family history: The presence of right-to-left shunt is associated with positive family history for migraine with aura 4
Diagnostic Considerations
When evaluating patients with migraine, particularly migraine with aura:
Transesophageal echocardiography (TEE) is the gold standard for detecting ASA and associated PFO, as it provides superior visualization of atrial septal anatomy compared to transthoracic approaches 3. ASA is defined as excessive bulging of the atrial septal fossa ovalis and often indicates septal fenestrations that may increase embolic risk 3.
Look for these specific features:
- Visual aura (present in >90% of migraine with aura cases) 6
- Earlier age of migraine onset
- Family history of migraine
- Recurrent moderate-to-severe headaches with typical migrainous features 6
Treatment Implications
Current evidence does NOT support routine PFO/ASA closure for migraine alone. The 2018 BMJ guideline addresses PFO closure specifically for cryptogenic stroke prevention, not migraine management 3. Response to preventive migraine treatments is not influenced by the presence or absence of right-to-left shunt, nor by whether antiplatelet therapy is used 4.
Standard migraine management applies:
- First-line acute treatment: NSAIDs (aspirin, ibuprofen, diclofenac)
- Second-line: Triptans, potentially combined with NSAIDs
- Preventive therapy based on standard indications 6
Important Caveats
While ASA is associated with migraine with aura, this does not mean ASA causes all cases of migraine with aura or that treating the ASA will resolve migraines. The association is strongest when ASA coexists with PFO, suggesting the mechanism involves paradoxical embolization or other shunt-related phenomena 3, 2. However, one recent study found tension-type headache and migraine without aura were actually more common than migraine with aura in PFO patients, highlighting the complexity of these relationships 7.
The key clinical takeaway: ASA, especially when combined with PFO, represents a significant risk marker for migraine with aura and may contribute to its pathophysiology through right-to-left shunting mechanisms. However, this finding should inform risk stratification and monitoring rather than drive invasive interventions solely for migraine management.