Distance and oxygen desaturation in 6-min walk test predict prognosis in COPD patients

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• 作者：Nagio Takigawa ; Atsuhiko Tada ; Ryo Soda ; Hiroshi Date ; Motohiro Yamashita ; Shigeto Endo ; Syuji Takahashi ; Noriko Kawata ; Takuo Shibayama ; Noboru Hamada ; Motoi Sakaguchi ; Atsushi Hirano ; Goro Kimura ; C
• 关键词：COPD ; Prognosis ; Oxygen desaturation ; 6-min walk test ; Pulmonary rehabilitation ; Lung volume reduction surgery
• 刊名：Respiratory Medicine
• 出版年：2007
• 出版时间：March 2007
• 年：2007
• 卷：101
• 期：3
• 页码：561-567
• 全文大小：307 K

文摘

The aim of the present study was to predict the prognosis of Chronic obstructive pulmonary disease (COPD) patients who underwent comprehensive pulmonary rehabilitation (PR). A total of 144 patients who performed PR between 1992 and 1999 was assessed. After PR, 67 patients underwent lung volume reduction surgery (LVRS). Baseline data before PR consisted of body mass index, serum albumin levels, use of supplement oxygen at home, pulmonary function, arterial blood gas analysis, and distance and fall of hemoglobin oxygen saturation (ΔSpO₂) in 6-min walk test. In addition to pre-PR factors, treatment with LVRS was taken into the analysis. The prognostic significance of variables influencing survival was determined by univariate analysis with Log rank test or multivariate analysis using Cox's proportional hazard model. By a median follow-up time of 8.4 years, the median survival time was 8.1 years (95 % confidence interval: 6.9–9.4 years). Albumin level, PaCO₂, distance and ΔSpO₂ were significant prognostic factors in univariate analysis. LVRS did not affect the prognosis. The multivariate analysis showed short distance and increase of ΔSpO₂ as significant independent predictors of the risk of death. 6-min walk test was very useful for predicting the prognosis of the COPD patients.