to determine whether change of laryngeal resistance causes shortening of expiratory time ( te ) and hence increase of respiratory frequency with co2 inhalation in conscious humans , 11 fit male subjects with permanent tracheostomies after laryngectomy for cancer ( l group ) and 8 matched control subjects ( c group ) inhaled co2 in mild hyperoxia to produce various levels of steady-state hyperpnea within `` '' nonvagal '' '' range 1 .
C0023078
laryngeal
C0023065
laryngectomy