Comparative Effectiveness of In-Hospital Use of Recombinant Factor VIIa for Off-Label Indications vs. Usual Care
Characteristics of Comparative Studies on Off-Label rFVIIa Use
With the exception of use in ICH, study sample sizes were small (median of 24 treated patients). The doses used in the studies that are the focus of this effectiveness review varied from 5 to 956 mcg/kg of patient weight, and only for intracranial hemorrhage was there a sufficient range of doses to assess the impact of rFVIIa dosing on outcomes. Most studies used indirect endpoints as their primary outcomes, particularly red blood cell (RBC) transfusion requirements. Direct outcomes, such as mortality, functional status, or thromboembolic events, were frequently reported, but most studies were individually underpowered to evaluate them. Most clinical research on rFVIIa has been directed and sponsored by Novo Nordisk, the product’s manufacturer. The strength of evidence available from existing studies was thereby compromised by small study size, use of indirect outcomes, and heterogeneity in dosage and indication. The applicability was diminished by less acutely ill patients and a mismatch between existing research and real-world patterns of indication and types of use.
- Yank V, Tuohy CV, Logan AC, et al. Comparative Effectiveness of In-Hospital Use of Recombinant Factor VIIa for Off-Label Indications vs. Usual Care, Comparative Effectiveness Review 21 (Prepared by Stanford–UCSF Evidence-based Practice Center under Contract No. 290-02-0017). Rockville, MD: Agency for Healthcare Research and Quality; May 2010. AHRQ Publication No. 10-EHC030-EF.
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