Differential efficacy of non-invasive vagus nerve stimulation for the acute treatment of episodic and chronic cluster headache: A meta-analysis

Ilse F de Coo, Juana Ca Marin, Stephen D Silberstein, Deborah I Friedman, Charly Gaul, Candace K McClure, Alok Tyagi, Eric Liebler, Stewart J Tepper, Michel D Ferrari, Peter J Goadsby, Ilse F de Coo, Juana Ca Marin, Stephen D Silberstein, Deborah I Friedman, Charly Gaul, Candace K McClure, Alok Tyagi, Eric Liebler, Stewart J Tepper, Michel D Ferrari, Peter J Goadsby

Abstract

Background: Two randomized, double-blind, sham-controlled trials (ACT1, ACT2) evaluated non-invasive vagus nerve stimulation (nVNS) as acute treatment for cluster headache. We analyzed pooled ACT1/ACT2 data to increase statistical power and gain insight into the differential efficacy of nVNS in episodic and chronic cluster headache.

Methods: Data extracted from ACT1 and ACT2 were pooled using a fixed-effects model. Main outcome measures were the primary endpoints of each study. This was the proportion of participants whose first treated attack improved from moderate (2), severe (3), or very severe (4) pain intensity to mild (1) or nil (0) for ACT1 and the proportion of treated attacks whose pain intensity improved from 2-4 to 0 for ACT2.

Results: The pooled population included 225 participants (episodic: n = 112; chronic: n = 113) from ACT1 (n = 133) and ACT2 (n = 92) in the nVNS (n = 108) and sham (n = 117) groups. Interaction was shown between treatment group and cluster headache subtype (p < 0.05). nVNS was superior to sham in episodic but not chronic cluster headache (both endpoints p < 0.01). Only four patients discontinued the studies due to adverse events.

Conclusions: nVNS is a well-tolerated and effective acute treatment for episodic cluster headache.

Trial registration: The studies were registered at clinicaltrials.gov (ACT1: NCT01792817; ACT2: NCT01958125).

Keywords: Episodic cluster headache; acute treatment; chronic cluster headache; meta-analysis; neuromodulation; non-invasive vagus nerve stimulation.

Figures

Figure 1.
Figure 1.
Proportion of participants who responded at 15 minutes for the first treated attack. cCH: chronic cluster headache; CH: cluster headache; CI: confidence interval; eCH: episodic cluster headache; nVNS: non-invasive vagus nerve stimulation; OR: odds ratio. Note: p values are from logistic regression; pooled analyses included study as a covariate.
Figure 2.
Figure 2.
Proportion of all treated attacks that achieved pain-free status at 15 minutes. cCH: chronic cluster headache; CH: cluster headache; CI: confidence interval; eCH: episodic cluster headache; GEE: generalized estimating equation; nVNS: non-invasive vagus nerve stimulation. Note: p values are from F tests; pooled analyses included study as a fixed effect. Graphed data are GEE model adjusted percentages with 95% CIs. Data for number of subjects using treatment/total number of subjects with data (n/N) attacks are unadjusted numbers.
Figure 3.
Figure 3.
Pain-free (a) or responder (b) status at 15 minutes for ≥ 50% of attacks. cCH: chronic cluster headache; CH: cluster headache; CI: confidence interval; eCH: episodic cluster headache; nVNS: non-invasive vagus nerve stimulation; OR: odds ratio. Note: OR > 1 favors nVNS. p values are from logistic regression; pooled analyses included study as a covariate.

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Source: PubMed

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