Long-Term Survival Analysis of the Canadian Lung Volume Reduction Surgery Trial
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BACKGROUND: The Canadian Lung Volume Reduction Surgery (CLVRS) trial was a multicentered randomized controlled trial that concluded that lung volume reduction surgery improves functional status and health-related quality of life (for at least 2 years) in selected patients with advanced emphysema. METHODS: This retrospective observational study assessed the long-term survival of patients enrolled in the CLVRS at 8 to 10 years after randomization. Vital statistics were gathered through telephone contact, physician records, and municipal obituaries. Survival analysis was undertaken using Kaplan-Meier and the Cox proportional hazards models. RESULTS: Fifty-two patients (84% of the initial 62 patients randomized) had a median survival time of 4.11 years. A 16-month survival advantage and a 20% reduction in mortality was observed in the LVRS group as compared with the best medical care group. Although clinically meaningful, these differences were not statistically significant. CONCLUSIONS: These findings echo those of other published reports and demonstrate the potential long-term benefit of LVRS in the treatment of end-stage emphysema.
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