Figure 26 - The threshold of cricothyroid elicitation in response to rate of tracheal pressure change measures 30 cmH2O/sec in normocapnia.
From the following article
Anatomy and development and physiology of the larynx
Clarence T. Sasaki
GI Motility online (2006)
doi:10.1038/gimo7
Hypercapnia reduces cricothyroid threshold, whereas hypocapnia raises its threshold. (Source: Sasaki45 with permission from Lippincott, Williams and Wilkins.)
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