. Anaesthetics : their uses and administration. iding valve(ST-c). The clamp (sc) slides along the tubes and fixesthem in position as is seen in Plate III. If the expiratoryvalve does not act well the patient must be encouraged to* blow out hard when the valve will evidence the successof his effort. The signs of anaesthesia are those mentionedin the preceding sections. Its onset is about as rapid asby ordinary oro-nasal methods. There is, however, a greaterliability to the supervention of cyanosis and this must beobviated by moving the stopcock so as to admit air or byopening the expiratory va
. Anaesthetics : their uses and administration. iding valve(ST-c). The clamp (sc) slides along the tubes and fixesthem in position as is seen in Plate III. If the expiratoryvalve does not act well the patient must be encouraged to* blow out hard when the valve will evidence the successof his effort. The signs of anaesthesia are those mentionedin the preceding sections. Its onset is about as rapid asby ordinary oro-nasal methods. There is, however, a greaterliability to the supervention of cyanosis and this must beobviated by moving the stopcock so as to admit air or byopening the expiratory valve in the nasal cap. Provided that the patient breathes well it is possible tomaintain anaesthesia sufficiently long for the performance ofany dental operation. If the narcosis becomes too light andmovement occurs, the mouth cap is re-applied, after spongingout any blood which is in the mouth, and the patient is putmore deeply under the influence of the gas. Great care mustbe taken to avoid cyanosis. The recovery is less rapid than PLATE Shows Mr. Colemans combined mouth and nasal administration of nitrousoxide. The administrator would usually stand to the left of the chair and thebag would hang behind it. Note method of holding the inhaler and arrange-ment of tubes and clamp. 94I NITROUS OXIDE GAS. 9S in the case of ordinary methods, and the patient is apt to bedazed and sometimes complains of being done up after aprolonged inhalation. Mr. Trewbys apparatus * is somewhat upon the samelines, but possesses many features of excellence which com-mend it. The figure (fig. 19) depicts its salient points sothat detailed description is unnecessary. The method of useis the same as that of Mr. Colemans apparatus.
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