![]() There was no change or an increase in Pa co co2 and H+ in the subjects with lower airway obstruction and small increases in arterial oxygen saturation and Pa o o2 occurred. Alveolar ventilation decreased except when alveolar hypoventilation was present to start with. With tracheostomy breathing, the reduction in dead space led to a decrease in minute ventilation except in the two patients with upper airway obstruction. Tracheostomy and respiratory dead space in emphysema Tracheostomy and respiratory dead space in emphysemaĪbstract Acute experimentation to judge the effects of reduction of dead space with tracheostomy breathing was performed on four subjects with lower airway obstruction (bronchitis and emphysema) and on two subjects with upper airway obstruction (carcinoma of the larynx and tracheal stenosis).
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