Relationship between diaphragm strength and supine position

Relationship between percentage fall in vital capacity on adopting the supine posture and diaphragm strength (assessed by measuring transdiaphragmatic pressure during maximum sniffs). Fall in vital capacity is seldom substantial until strength is reduced to 30% of normal.

Reprinted with permission of the American Thoracic Society. Copyright © 2015 American Thoracic Society. Cite: Mier-Jedrzejowicz A, Brophy C, Moxham J, Green M. Assessment of diaphragm weakness. Am Rev Respir Dis 1988; 137:877. The American Journal of Respiratory and Critical Care Medicine is an official journal of the American Thoracic Society.

Graphic 102588 Version 1.0

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