The art of anaesthesia . with that described on page 163 forintratracheal anaesthesia, tbe only difference being that airalone is delivered intermittently instead of constantly. Thisis the most reliable method of positive ventilation and maybe done by an improvised catheter or small tube, to whichis attached an ordinary foot bellows, and simple pressuregauge. A pressure gauge may be improvised by putting oneand one-half inches of mercury in the wash bottle attachedto the oxygen tank. The short tube is left free, the longtube projects 25 mm. (one inch) below the surface of themercury and is con
The art of anaesthesia . with that described on page 163 forintratracheal anaesthesia, tbe only difference being that airalone is delivered intermittently instead of constantly. Thisis the most reliable method of positive ventilation and maybe done by an improvised catheter or small tube, to whichis attached an ordinary foot bellows, and simple pressuregauge. A pressure gauge may be improvised by putting oneand one-half inches of mercury in the wash bottle attachedto the oxygen tank. The short tube is left free, the longtube projects 25 mm. (one inch) below the surface of themercury and is connected to the tube which delivers the THE SIGNS OF ANESTHESIA 93 air from the bellows to the patient (see Fig. 57). Anypressure in this tube greater than 25 mm. or one inch ofmercury will escape out of the bottle. If mercury is notavailable, a pitcher or jar of water 15 inches deep will tube projecting into this water for a depth of 13)4inches will give the same result since the specific gravityof mercury is Fig. 55.—Sylvester method of artificial respiration, first position. Positive ventilation by intrapharyngeal insufflation isnot quite so efficient. Air delivered into the pharynx es-capes in four directions: into the mouth, into the nose, intothe oesophagus and stomach, and into the trachea. Everyexit but the tracheal must be shut off. The mouth may beclosed by a strip of adhesive plaster fastened at one endunder the chin and at the other to the forehead. Escapethrough the nose is controlled by the presence of the nasal 94 ANESTHESIA tubes (Figs. 83 and 86) through which the air is beingdelivered. Accumulation of air in the stomach is preventedby placing a heavy weight (twenty pounds) on the abdo-men and strapping this in position. The operator may siton the abdomen if a weight is not available. If artificialrespiration must be carried on during a laparotomy, astomach tube should be passed and left in situ. This will
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanesthe, bookyear1919
