How does the absence or presence of subglottal medialization affect glottal airflow?

CONCLUSIONS: Medialization of the subglottis does not significantly affect the turbulence reduction properties of the subglottis, even though subglottal asymmetry is introduced. On the other hand, large amounts of medialization of the glottis only (with no subglottal medialization) can introduce significant amounts of turbulence.

from the Annals of Otology, Rhinology, and Laryngology

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