Fig. 1From: Vertical displacement of pleura: a new method for bronchospasm evaluation?M-mode evaluation of pleural vertical displacement and calculus of the comparison index: \( \frac{{{\text{Skin-to-maximal inspiration point distance}}\left( {\text{A}} \right) \, {-}{\text{ skin-to-maximal expiration point distance}}\left( {\text{B}} \right)}}{{{\text{skin-to-maximal inspiration point distance}}\left( {\text{A}} \right)}} \times 100 \)Back to article page