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In all inhalation anesthesias the most frequent and important embarrassments to respiration are obstructions in the air way. Of all causes of obstruction the tongue falling back on the glottis is altogether the most common. As this fault in technic is within the control of the anesthetist and always removable, means to facilitate holding the tongue forward are practicable without the necessity of holding the jaw forward with the hand. There has been developed in insufflation an improved method over any kind of mask for administering ether, and pharyngeal insufflation has proved that the advantages in almost all kinds of cases may be secured without the necessity of intratracheal apparatus. When the nasal catheters are not used, but introduction by mouth is preferred, the combination of a rebreathing tube, to keep the tongue forward, and a tube for insufflation of the ether is a great convenience, and for this purpose
Pinneo FW. A PHARYNGEAL TUBE COMBINING REBREATHING AND INSUFFLATION. JAMA. 1915;LXV(15):1279. doi:10.1001/jama.1915.25810150002018d
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