Contrast echocardiography and migraine in divers with patent foramen ovale

Area of Science:

• Cardiology
• Neurology
• Diving Medicine

Background:

• The association between patent foramen ovale (PFO) and migraine, especially migraine with aura, is debated.
• It remains unclear if paradoxical embolism through a PFO triggers migraine headaches.
• Contrast echocardiography is a safe method to diagnose PFO and can provoke cerebral embolization.

Purpose of the Study:

• To investigate whether provoked cerebral micro-embolism in individuals with PFO triggers migraine attacks.
• To assess the link between PFO and migraine in a specific high-risk population (divers).

Main Methods:

• Twenty-four male divers, known to have a higher prevalence of PFO and migraine, underwent trans-thoracic echocardiography.
• A contrast solution (saline and air mixture) was used to provoke potential embolization.
• Participants were monitored for migraine occurrence within 24 hours post-procedure.

Main Results:

• A patent foramen ovale was detected in 8 out of 24 divers (33%).
• None of the participants reported experiencing a headache in the 24 hours following the echocardiography procedure.

Conclusions:

• Preliminary findings suggest that experimentally induced cerebral micro-embolism does not consistently trigger migraine crises in individuals with minimal-to-medium sized PFO.
• These results question the direct causal link between PFO-mediated paradoxical embolism and migraine attacks.