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Rationale and Design for the BLOCK-SAH Study (Pterygopalatine Fossa Block as an Opioid-Sparing Treatment for Acute Headache in Aneurysmal Subarachnoid Hemorrhage): A Phase II, Multicenter, Randomized, Double-Blinded, Placebo-Controlled Clinical Trial with a Sequential Parallel Comparison Design.
Busl KM, Smith CR, Troxel AB, Fava M, Illenberger N, Pop R, Yang W, Frota LM, Gao H, Shan G, Hoh BL, Maciel CB; BLOCK-SAH Investigators. Busl KM, et al. Neurocrit Care. 2025 Feb;42(1):290-300. doi: 10.1007/s12028-024-02078-z. Epub 2024 Aug 13. Neurocrit Care. 2025. PMID: 39138719 Free PMC article.