Right-to-left shunt is associated with reduced cerebral vascular reactivity in migraine patients with aura.

Migraine patients with aura may have a condition called right-to-left shunt (RLS). This study looked at how RLS affects blood flow in the brain. Researchers examined patients at Anhui No. 2 Provincial People's Hospital. They used special ultrasound tests to detect RLS and check for a patent foramen ovale (PFO). Patients with RLS were compared to those without PFO. RLS was graded based on how many microbubbles appeared during tests. The study also measured cerebrovascular reactivity using a breath-holding index. Results showed that patients with RLS had reduced cerebrovascular reactivity. This means their brain blood flow response to certain stimuli was weaker. Understanding this connection could help explain some migraine symptoms. It may lead to better treatment options for patients suffering from migraines with aura. More research is needed to explore these findings further and improve patient care. Clinical relevance: This study indicates that RLS may worsen migraine symptoms by reducing brain blood flow response, suggesting potential avenues for targeted treatments in affected patients.