Longitudinal MRI angiography confirms rimegepant treats migraine attacks without constricting cerebral or extracerebral arteries, unlike triptans, making it safe for patients with vascular disease.
No vasoconstriction on MRAFirst direct evidence that rimegepant doesn't constrict brain arteries during migraine attacks
What the researchers found
Rimegepant effectively treats migraine without constricting cerebral or extracerebral arteries, as demonstrated by longitudinal MRI angiography during spontaneous attacks.
Why it matters
This is the first direct proof that rimegepant doesn't constrict brain blood vessels during actual migraine attacks — critical safety evidence for the millions of migraine patients who can't use triptans due to heart disease or stroke risk.
How the study worked
Prospective, longitudinal study using magnetic resonance angiography at a single academic imaging centre to measure arterial diameter during migraine attacks.
What this study cannot tell us
Single academic center; likely small sample size given the logistical challenge of capturing spontaneous migraine attacks on MRI; may not represent all migraine subtypes.
How to read the evidence
Prospective longitudinal imaging study — strong mechanistic evidence but likely small sample size due to logistical constraints.
When this study was published
Published in 2026, providing the first direct vascular imaging evidence for CGRP antagonists during spontaneous migraine.
The bigger picture
Confirming the non-vasoconstrictive mechanism of CGRP antagonists opens migraine treatment to millions of patients with cardiovascular disease who were previously left without effective options.
Questions still open
- Can rimegepant be recommended as first-line acute treatment for migraine patients with cardiovascular risk factors?
- Does the lack of vasoconstriction mean CGRP antagonists work through entirely different mechanisms than triptans?
Common questions
Why can't some migraine patients use triptans?
Does this study prove rimegepant is safe for the heart?
Read the original research
Investigation of the rimegepant effect on cerebral and extracerebral arteries during migraine attacks: a longitudinal magnetic resonance angiography study.
Brain communications, 8(1), fcag004
Citation
Chaudhry, Basit Ali; Younis, Samaira; Al-Mashat, Hassan; Gozalov, Emil; Amin, Tariq Mohammad; de Koning, Patrick J H; Larsson, Henrik Bo Wiberg; Amin, Faisal Mohammad. (2026). Investigation of the rimegepant effect on cerebral and extracerebral arteries during migraine attacks: a longitudinal magnetic resonance angiography study.. Brain communications, 8(1), fcag004. https://doi.org/10.1093/braincomms/fcag004