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Revista chilena de enfermedades respiratorias

versión On-line ISSN 0717-7348


RODRIGUEZ N, IVÁN; HENRIQUEZ J, SCARLETT; VASQUEZ M, PAULINA  y  ZENTENO A, DANIEL. Six minute walking test and pulmonary function in patients with post infectious bronchiolitis obliterans. Rev. chil. enferm. respir. [online]. 2014, vol.30, n.2, pp.68-74. ISSN 0717-7348.

Introduction: Post-infectious bronchiolitis obliterans (BO) is a chronic respiratory disease that is established as a consequence of a lung infection produced by adenovirus. The clinical and radiological evidence as well as spirometric variables are the cornerstones of diagnosis; however, the functional impact of lung damage, assessed through the six minute walking test (6MWT), has been scarcely studied in this group of patients, notwithstanding it has been recommended in the Chilean guidelines. The aim of the study is to evaluate the correlation between spirometric variables and 6MWT performance in patients diagnosed with BO. Patients and Methods: Correlation study conducted in pediatric pulmonary rehabilitation program of Guillermo Grant Benavente Hospital from Concepción. Chile. Records of spirometry (FEV1, FVC, FEV1/FVC and FEF25-75) and 6MWT(Distance walked (DW), heart rate, oxygen saturation, dyspnea and leg fatigue) of 22 children and adolescents diagnosed with BO were selected. The absolute values of spirometric and 6MWT variables were compared with reference values of Knudson et al and Gatica et al respectively. Results are expressed by median and range (maximum and minimum). In the statistical analysis, normality test (Kolmogorov-Smirnov), non-parametric test (Wilcoxon, Mann-Whitney) and correlation analysis (Rho-Spearman) were done by SPSS 11.5 with significance of p < 0.05. Results: The spirometry was obstructive in all patients, advanced ventilatory limitation was found in 9 children, moderate in 4, mild in 3 and minimum in 6. The WD was 597 m (750-398), 9% below the predicted value according to age (p < 0.003). The WD was lower in those with greater severity in spirometric impairment (p = 0.012). The WD expressed as a percentage of predicted value showed a significant correlation with % FEV1 (r = 0.70, p = 0.0001), FEV1/FVC ratio (r = 0.58, p = 0.004) and FEF25-75% (r = 0.70, p = 0.0001). On the other hand only saturation at the end of 6MWT showed significant correlation with % FVC (r = 0.44, p = 0.04). Conclusion: Performance during the 6MWT was positively correlated with spirometry, validating the 6MWT as a tool to assess the functional impact of lung damage in patients with BO. Future prospective studies are needed to evaluate the correlation between lung function and exercise tolerance in these patients.

Palabras clave : Six minute walking test; lung function; bronchiolitis obliterans; children.

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