A trial was undertaken in children to compare the use of halothane and isoflurane in outpatient dental anaesthesia. A wholly inhalation technique was chosen and nitrous oxide in oxygen was delivered from a Boyle's machine via a coaxial (Bain) breathing system and was supplemented with either halothane or isoflurane. Isoflurane produced significantly fewer arrhythmias than halothane but the induction of anaesthesia took longer and proved more difficult.
Transcutaneous oxygen saturation of haemoglobin was measured in 101 patients en route from the operating room to the recovery room. Twenty-nine became significantly hypoxaemic during the journey. The incidence of hypoxaemia was not found to relate to age, weight, duration or type of surgery, type of anaesthesia or pre-existing disease. Duration of the interval between cessation of oxygen in the operating room and arrival in recovery room was the only significant finding in patients who became hypoxaemic.
Crystal applied to double-stick disc. fixation of stethoscopes to the chest and arms for many years, l Recently I have applied the crystal over the radial artery using 3M Double-Stick Discs | The maximal radial pulse at the wrist is detected and can be marked with a pen. The hole in the double-stick disc is accurately centered over the mark (Figure 1). Ultrasonic transmission gel is then applied to the crystal, just enough to fill the indentation keeping the rest of the surface dry. The paper cover is removed from the disc and the crystal applied, the gel contacting the skin through the hole in the disc (Figure 2). If the arm is tucked in at the side of the patient a one inch piece of adhesive tape can be applied to prevent drag on the crystal. This technique has proved to be very satisfactory, and is now routinely used in our department.
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