An apparatus for use in treating pulmonary emphysema was designed to assist respiration in both the inspiratory and the expiratory phases. Air was supplied by an intermittent positive pressure breathing (IPPB) device in such a way that it flowed alternately into the patient's airways (inspiratory phase) and into an inflatable belt strapped about his body at the level of the diaphragm (expiratory phase). The apparatus was used initially on 27 patients with obstructive emphysema secondary to anthracosilicosis. Measurements of minute ventilation, tidal volume, expiratory flow rate, carbon dioxide excretion, arterial oxygen saturation, and the pCO2 and pH of the blood showed that little, if any, objective improvement in the patients could be ascribed to the addition of the inflatable belt. Subjective improvement was reported by most patients, who thought they could breathe better.
Fraimow W, Mann JJ, Flickinger H, Cathcart RT. EXSUFFLATION BELTUSE WITH INTERMITTENT POSITIVE-PRESSURE BREATHING DEVICE IN TREATMENT OF PULMONARY EMPHYSEMA. JAMA. 1960;173(10):1098–1101. doi:10.1001/jama.1960.03020280038008
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