The CBCL/4-18 scores of children with sighing dyspnoea were not significant different from age-matched healthy children and a heightened anxiety score was not confirmed in this study. Office spirometric values in patients with sighing dyspnoea were normal.

RV and RV/TLC were higher in children with sighing dyspnea that were not measured by spirometry, but TLC and FRC(pleth) were not increased. The causal link between dysfunctional breathing patterns and changes in static lung volumes was not able to be determined in the present study. The possibility of heterogeneity of patients with sighing dyspnea obscures the significance of lung volume discrepancy in this population; further subdivision of children with sighing dyspnea in a larger cohort of patients is required.

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