Improvement in angiographic cerebral vasospasm after intra-arterial verapamil administration.

BACKGROUND AND PURPOSE Endovascular options for therapy for patients with vasospasm after SAH include angioplasty and intra-arterial vasodilator infusion. Preliminary studies of the effects of the calcium channel antagonist verapamil on angiographic vasospasm have yielded mixed and/or qualitative results. In this study, improvement in angiographic vasospasm after intra-arterial verapamil administration is demonstrated with quantitative, blinded methods. MATERIALS AND METHODS This retrospective observational case series includes 12 patients with vasospasm after SAH who collectively received 16 treatments with intra-arterial verapamil during a 2-year period at our institution. The exclusion criterion was concurrent treatment with angioplasty. Blinded reviewers quantitatively evaluated angiograms from each patient and/or treatment after presentation with SAH and before and after intra-arterial treatment of vasospasm. RESULTS Patients were treated with intra-arterial verapamil for vasospasm 9 ± 4 days after SAH with a range from 1 to 16 days. For the 34 arterial distributions treated, the segment with the worst angiographic vasospasm from each arterial distribution averaged 51 ± 13% stenosis, which improved to 29 ± 18% stenosis (P < .001). There was no significant difference in treatment effect in proximal arterial segments, which may be amenable to angioplasty, compared with distal segments (P > .05). There was no significant difference in treatment effect in arterial segments previously subjected to angioplasty compared with other segments (P > .05). CONCLUSIONS Intra-arterially administered verapamil improves angiographic vasospasm after SAH when administered at 10 ± 3 mg per arterial distribution. Optimal dose, infusion rate, and retreatment interval remain to be determined. Randomized controlled trials are needed to prove efficacy in the treatment of clinical vasospasm.