. The practice of anæsthetics . Fig. 59.—Trocar and cannula with side lube Fig. 60.—Method of holding trocar and cannula. Technique. — Patient in semi-recumbent trocar and cannula as in exploratory punc-ture. A sharp push is required in order to penetrate EMERGENCY OPERATIONS 349 the plcuni, which may be thickened. By finger, guardthe instrument from penetrating too deeply (fig. 60);withdraw trocar and turn stopcocks. When fluid runsfreely cannula should be pointed obliquely upwardsto prevent diaphragm or lung blocking itsopening. Do not remove fluid
. The practice of anæsthetics . Fig. 59.—Trocar and cannula with side lube Fig. 60.—Method of holding trocar and cannula. Technique. — Patient in semi-recumbent trocar and cannula as in exploratory punc-ture. A sharp push is required in order to penetrate EMERGENCY OPERATIONS 349 the plcuni, which may be thickened. By finger, guardthe instrument from penetrating too deeply (fig. 60);withdraw trocar and turn stopcocks. When fluid runsfreely cannula should be pointed obliquely upwardsto prevent diaphragm or lung blocking itsopening. Do not remove fluid too rapidly. Screw offflow occasionalh to allow heart and lungs to accom-modate themselves to altered circulation, otherwisepatient may become faint, or actually collapse, mayexpectorate frothy material, or haemorrhage may occurcausing the sputum to he blood-stained. At the sametime the bottle may be emptied, if necessarv. It israrely necessary to remove the fluid completely. Ifintrapleural tension be sufficiently lowered, absorptionof remaining fluid is usually ensured. Finish
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