Figure 1. Labeled syringes. LE'ITERS TO THE EDITOR 307 not to "obscure" the graduated markings. With this arrangement, the face of the drug label is not visible during syringe injections unless the syringe is rotated 180" during the injection process. Labeling the syringes with the label partially overlying the graduated markings also provides easy visibility of the drug labels when the syringes are placed on a flat surface. This is obviously a simple suggestion, yet it could prevent some serious mistakes. Figure 1. The thumb is obstructing the orifice to prevent the balloons from deflating.teaching pulmonary alveolar physiology and cardiac ventricular function in the anesthesia classroom.
Intravenous regional anaesthesia, confined to the distal lower limb and using bupivacaine 0.25%, was studied in 12 patients undergoing orthopaedic procedures to the feet. The technique was well accepted by both surgeons and patients and was free from serious toxicity. Bupivacaine was demonstrated in the systemic venous circulation in every case prior to surgery, whilst the tourniquet remained deflated. The plasma bupivacaine levels were less than that associated with toxicity, except in one case exhibiting signs of minor toxicity (bupivacaine plasma level 1.99 micrograms/ml-1). Reasons for the leak in spite of a well-conducted technique are discussed.
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