Anaesthesia
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We hypothetised that the rate of pre-oxygenation could be altered by the increase in lung volume and airflow obstruction observed in emphysema. End-tidal oxygen concentration was monitored, using a paramagnetic oxygen analyser, during 10-min pre-oxygenation (tidal breathing of 100% oxygen) in 10 normal patients and in 10 patients with severe diffuse emphysema documented by computerised tomography. Emphysema was characterised by an important increase in functional residual capacity of the lungs [190 (23)% of predicted values] and a decrease in expiratory flow. ⋯ After 3 and 5 min of pre-oxygenation, the end-tidal fractional oxygen concentration was significantly lower in the emphysema group than the control group [mean (SD); value at 3 min: emphysema: 0.83 (0.06) vs. control: 0.91 (0.02), p = 0.0005]. Individual values of end-tidal oxygen concentration measured after 3, 5 and 10 min of pre-oxygenation were negatively correlated with functional residual capacity in the emphysema group, whereas no such correlation was found in the control group. These results suggest that pre-oxygenation should be monitored in patients with diffuse emphysema to ensure that adequate pre-oxygenation is achieved.
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Two case histories of pregnant women with Guillain Barré syndrome (acute demyelinating polyradiculoneuritis) are reported. The first required anaesthesia during the second trimester for a minor surgical procedure. ⋯ A review of the management of Guillain Barré syndrome in pregnancy discusses anaesthetic management, intensive care and the use of plasmapheresis and gamma-globulins. The care of pregnant women recovered from Guillain Barré syndrome is also discussed.
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Comment Letter Case Reports
Percutaneous tracheostomy in three morbidly obese patients using the 'Blue Rhino' technique.