A physiologic study on respiratory handicap of the laryngectomized.

Lack of the upper airway function after laryngectomy creates unfavorable effects on the lower respiratory tract. The purpose of this study is to re-evaluate this relationship objectively. Respiratory function tests were performed on 13 laryngectomized patients. Pulmonary volumetry and ventilometry revealed increased RV and FRC, and decreased FEV1.0%, indicating evidence of obstructive changes in the lung, MEFV-recordings showed greater downward convexity than those of the normal at the lower volume level. The value of MEF50/body-height was definitely smaller than normal average in the same age group. Pulmonary resistance was in wide variety but definitely lower than normal because of lack of the upper airway resistance. If this component is added to the value, the total will be in normal range or even higher. Dynamic compliance remained mostly in the normal range when measured using a mask at the tracheostoma. The value was lower than normal when measured through a cuff-canula. The difference in static and dynamic compliances was greater than that in normal cases, which may indicate evidence of uneven distribution of air in the lung. Regular check-up and suitable respiratory care are recommended on the laryngectomized.