Anaesthesia and intensive care
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Anaesth Intensive Care · Nov 2010
Influence of leg position on the depth and sonographic appearance of the sciatic nerve in volunteers.
We investigated the effect of leg position on the depth of the sciatic nerve and quality of ultrasound images taken at the proximal and mid-thigh level. Twenty-one volunteers with average body mass index were recruited to represent the younger population receiving sciatic nerve blocks for sports injury surgery. The volunteers were placed in the lateral position, with the hip flexed and with the hip in a neutral (extended) position. ⋯ More clinicians favoured the proximal sciatic image with the leg in the neutral position. Although statistically significant, the depth difference is probably not a major clinical consideration in most patients with an average body mass index. We suggest clinicians place the leg in the most ergonomically favourable position when performing sciatic nerve blocks in the proximal thigh in these patients.
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Anaesth Intensive Care · Nov 2010
Vocal cords-carina distance in anaesthetised Caucasian adults and its clinical implications for tracheal intubation.
Previous work has assessed vocal cords-carina distance in Chinese patients and compared it to commonly used tracheal tubes. In addition, an attempt was made to identify surface anatomy measurements with short tracheas. We have examined the length of tracheas in Caucasian patients and compared it with currently used tracheal tubes. ⋯ The best predictors in our study of vocal cords-carina distance less than 11.3 cm were a height of < or = 182 cm, an ulnar length of < or = 31.2 cm or a thyroid to xiphisternum distance of < or = 31.8 cm. This correlation is poor however and prediction of vocal cords-carina distance remains difficult clinically. It was therefore concluded that surface anatomy measurements are a poor predictor of vocal cords-carina distance.
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Anaesth Intensive Care · Nov 2010
Dapsone-associated methaemoglobinaemia in patients with a haematologic malignancy.
Methaemoglobinaemia is an uncommon problem which can significantly impact on oxygen carriage and may necessitate intensive care management. The occurrence of symptomatic methaemoglobinaemia over a three-month period in four patients with haematological malignancies on dapsone for Pneumocystis jiroveci pneumonia prophylaxis prompted a review of its use in this group of patients. We performed a retrospective audit to identify any contributing factors. ⋯ Our experience suggests that dapsone should be used with caution in patients with haematological malignancies as they are particularly at risk of developing symptomatic methaemoglobinaemia due to underlying anaemia, immunosuppression and potential drug interactions. The current recommendation of dapsone for Pneumocystis jiroveci pneumonia prophylaxis in this group of patients needs to be reviewed. When methaemoglobinaemia does occur early recognition is possible with routine co-oximetry testing and prompt treatment may lessen the need for or duration of intensive care supports.