Transnasal Evaporative Cooling Device for Migraine: A Prospective, Randomized, Double-blind, Multicenter Trial

Background: There is a need for effective and affordable nondrug therapies for the acute treatment of migraine. Transnasal neuromodulation via evaporative cooling may modulate the sphenopalatine ganglion, which is implicated in migraine. The study aimed to evaluate the safety, tolerability, and optimal dose of this method for acute migraine treatment. Methods: A prospective, randomized, double-blind, multicenter study was conducted at 3 US sites. Subjects received 15 minutes of in-clinic treatment during a migraine attack. Twenty-four subjects were randomized into three groups: 24 liters per minute (LPM), 18 LPM, and 6 LPM. Pain and Most Bothersome Symptom (MBS) were recorded at baseline 2 and 24 hours post treatment. The primary endpoint was pain relief (PR) at 2 hours. Secondaryendpoints included tolerability, MBS relief and pain freedom (PF) at 2 hours and 24 hours Results: Eighty-seven adults with episodic migraine with or without aura were enrolled. PR at 2 hours without rescue medication (woRM) was reported by 89% (8/9) of the participants who received 6LPM. PR at 2 hwoRM was reported to be 56% (5/9) and 50% (3/6) in the 18LPM and 24LPM groups, respectively. PF at 2 hours woRM was reported by 44% (4/9) of participants in the 6LPM group, and no participants in the 18LPM or 24LPM group reported PF at 2 hours. MBS relief at 2 hwas 78% (7/9), 67% (6/9) and 50% (3/6) in the 16, 18 & 24LPM groups, respectively. No adverse events occurred in the 6LPM group,and none were serious or severe in any group. Moderate discomfort was reported by 11% (1/9) of the participants in the 6LPM group. In contrast, 33% (3/9) and 83% ofthe 18LPM and 24LPM groups reported moderate or severe discomfort, respectively. Zero, one, and two subjects discontinued the 15-minute session in the 6LPM, 18LPM, and 24LPM groups, respectively. The study was terminated early because of slow subject accrual. Conclusions: Lower flow rates during transnasal cooling were both effective and tolerable for acute migraine treatment. The study became a dose-ranging trial, with lower flow rates,showing greater efficacy. A future at-home study is planned. Trial Registration: ClinicalTrials.gov Identifier: NCT04936061; Registration date: June 15, 2021. The full study protocol can be accessed at https://clinicaltrials.gov/study/NCT04936061.