British journal of anaesthesia
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Br J Anaesth
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The scavenging of gases from anaesthetic circuits may present hazards to the patient. The negative pressure relief valve prevents the generation of subatmospheric pressures in the circuit as a result of a discrepancy between the fresh gas flow and the gas evacuation rate. ⋯ Six different valves were studied. Two membrane valves came nearest to fulfilling the ideal requirements.
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A Doppler ultrasound bloodflow detector was used to localize the third division of the subclavian artery, rendering the supraclavicular approach to the brachial plexus safer and highly successful.