Anæsthesia and anæsthetics general and local . red of teethwithout any pain, except in powerful subjects who require moreprofound anaesthesia in order to abrogate reflex highly recommends a method which he has personallyexperienced, consisting of administering gas through a smallnose-cap containing two small metal tubes attached to rubbertubes leading to a gas bag behind the patients head. The pa-tient usually breathes through the nose, but even if he breathesthrough the mouth anaesthesia is readily induced. Though thereis complete anaesthesia, there is not so marked effect o
Anæsthesia and anæsthetics general and local . red of teethwithout any pain, except in powerful subjects who require moreprofound anaesthesia in order to abrogate reflex highly recommends a method which he has personallyexperienced, consisting of administering gas through a smallnose-cap containing two small metal tubes attached to rubbertubes leading to a gas bag behind the patients head. The pa-tient usually breathes through the nose, but even if he breathesthrough the mouth anaesthesia is readily induced. Though thereis complete anaesthesia, there is not so marked effect of the drugas there is with the ordinary method, cyanosis being less,pupils not so dilated, the eye often remaining mobile, and thecondition being more one of marked drowsiness than one ofcoma. Again, the operator may administer oxygen with nitrousoxide; or again, he may prolong the anaesthesia by the use of asmall quantity of ether, providing the stomach is empty andcare be taken to prevent blood from getting into the throat. NITROUS OXIDE 83. Fig. 19.—Anaesthetic Inhaler (Hillard). Fig. 19. A method of prolonging nitrous oxide anaesthesia in dentalpractice by means of an additional gas tube leading from the bottles to acatheter, which is passed through one of the patients nostrils. (D—A).The administration is conducted in the usual way with stop-cock and face-piece until the patient has lost consciousness, then taking the precautionthat the ordinary gas bag is full, and choosing the end of an inspirationthe face-piece is removed; the nasal tube (A) is rapidly passed (this canbe done during a single expiration), the face-piece is re-applied, and thepedal stop-cock is turned so that the gas now flows only through the nasaltube. At this stage the inhalation is continued by both nasal tube andface-piece up to full anaesthesia. The face-piece is now finally removed,the operation is begun, and narcosis is maintained by the nasal tube prevent the return of consciousnes
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