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Expiratory flow-volume curve showing "knee" pattern

Expiratory flow-volume curve showing "knee" pattern
Expiratory flow-volume curve showing a "knee" pattern, which is considered to be a normal variant most commonly seen in young adults.
TLC: total lung capacity; RV: residual volume.
Modified from:
  1. Shin HH, Sears MR, Hancox RJ. Prevalence and correlates of a 'knee' pattern on the maximal expiratory flow-volume loop in young adults. Respirology 2014; 19:1052.
  2. Johnston R. What’s a normal Flow-volume Loop? PFT Blog. Available at: http://www.pftforum.com/blog/whats-a-normal-flow-volume-loop (Accessed on July 7, 2016).
Graphic 108135 Version 1.0