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  • Title: A cost-utility analysis of treatment for acute childhood idiopathic thrombocytopenic purpura (ITP).
    Author: O'Brien SH, Ritchey AK, Smith KJ.
    Journal: Pediatr Blood Cancer; 2007 Feb; 48(2):173-80. PubMed ID: 16550529.
    Abstract:
    BACKGROUND: The primary objective in the treatment of acute pediatric idiopathic thrombocytopenic purpura (ITP) is to rapidly increase the platelet count. METHODS: We built a decision analytic model to evaluate the cost-utility of four commonly used treatment strategies: intravenous immunoglobulin G (IVIG) 0.8 g/kg, anti-D 75 mcg/kg, methylprednisolone (30 mg/kg for 3 days), and prednisone (4 mg/kg/day for 4 days). In our baseline model, all children were hospitalized upon presentation, and discharged once the platelet count reached > or =20,000. We performed a literature search to estimate time to platelet count > or =20,000 for each strategy, as well as the probability of side effects. We obtained cost data and quality of life measures from institutional and published data sources. RESULTS: Total cost of one-time treatment for a 20 kg child was US dollars 786 with prednisone, US dollars 1,346 with methylprednisolone, US dollars 2,035 with anti-D, and US dollars 2,492 with IVIG. The strategies of IVIG and methylprednisolone were less effective and more expensive than anti-D and prednisone, respectively. Although anti-D caused the most rapid rise in platelet counts, the incremental cost-utility ratio (costs incurred by using anti-D instead of prednisone divided by health benefit of using anti-D instead of prednisone) was US dollars 7,616 per day of severe thrombocytopenia avoided, primarily due to the much higher medication cost of anti-D. Utilizing an outpatient model, the cost difference between anti-D and prednisone was even more striking. CONCLUSIONS: The clinical benefit of anti-D is offset by a substantial cost increase. Although often overlooked in favor of newer agents, a brief course of high-dose prednisone is an inexpensive and effective treatment for acute ITP.
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