• Gurpreet S Gandhoke, Kenneth J Smith, Ajay Niranjan, Raymond F Sekula, and L Dade Lunsford.
• Marion Bloch Neuroscience Institute, Saint Luke's Hospital, Kansas City, Missouri, USA. Electronic address: Gurpreet.gandhoke@gmail.com.
• World Neurosurg. 2019 May 1; 125: 207-216.

Background And ObjectiveBoth microvascular decompression (MVD) and Gamma Knife radiosurgery (GKRS) are time-tested treatment modalities for trigeminal neuralgia (TN). There is little evidence in the literature studying these modalities head to head in a cost-effectiveness comparison.ObjectiveTo evaluate the cost-effectiveness of MVD compared with GKRS for treating patients with TN.MethodsWe developed a Markov cost-effectiveness model for the U.S. health care system to account for all costs related to MVD and GKRS as treatment modalities for TN, from the health care system perspective, over a patient lifetime horizon. A base case was estimated using data from previous studies, from our own GKRS experience, and from a current data analysis of patients undergoing MVD. We derived model inputs, including health care costs, survival, and utility estimates, from the literature. We used age-specific, sex-specific, and race-specific mortality from national registries. Costs studied included those for MVD, for GKRS, for treating complications from either procedure, and for medications throughout patient lifetimes. We performed multiple 1-way, 2-way, and probabilistic sensitivity analyses to confirm the robustness of model assumptions and results. The incremental cost-effectiveness ratio (ICER), with a threshold of $50,000 per quality-adjusted life-year (QALY) gained, defined cost-effectiveness.ResultsThe base case had an ICER of $12,154 per QALY for MVD compared with GKRS. Probabilistic sensitivity (Monte Carlo) analysis showed that MVD was cost-effective in 70% of model iterations. GKRS was favored when the willingness to pay threshold was <$12,000 per QALY gained.ConclusionsIn patients medically eligible for either procedure, we found MVD to be the most cost-effective modality to treat TN, primarily because of its reported greater durability. MVD remained the most cost-effective strategy across a broad range of model input values in sensitivity analyses.Copyright © 2019 Elsevier Inc. All rights reserved.

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