Anaesthesia and intensive care
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Anaesth Intensive Care · Feb 1980
An analysis of the performance of a variable venturi-type oxygen mask.
The theoretical performance of the Hudson Multivent mask is considered. A method is described of determining the flow-weighted mean inspired oxygen concentration produced by the mask. ⋯ At settings above 30% predictable function was found to be unlikely, whatever the supplied oxygen flow rate. Recommendations are made regarding the use of this device.
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Anaesth Intensive Care · Nov 1979
The incidence and aetiology of phrenic nerve blockade associated with supraclavicular brachial plexus block.
A trial to ascertain the true incidence of inadvertent phrenic nerve block with brachial plexus block via the supraclavicular approach was carried out. Phrenic nerve block was monitored by x-ray screening of the diaphragm. ⋯ The possible causes of phrenic nerve block with brachial block are discussed. It is concluded that the phrenic nerve is blocked peripherally in front of the scalenus anterior.
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An introducer to facilitate nasotracheal intubation is described. The instrument is passed orally and a distal hook engages in the Murphy foramen of a P. V. C. nasal tube to direct it atraumatically into the trachea.