British journal of anaesthesia
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Comparative Study Clinical Trial Controlled Clinical Trial
Prediction of movement at laryngeal mask airway insertion: comparison of auditory evoked potential index, bispectral index, spectral edge frequency and median frequency.
We have studied 46 patients to compare the efficacy of the auditory evoked potential (AEP) index, bispectral index (BIS), 95% spectral edge frequency (SEF) and median frequency (MF) in predicting movement in response to insertion of the laryngeal mask airway (LMA). Anaesthesia was induced with target-controlled infusions of propofol and alfentanil. After loss of eyelash reflex and adequate jaw relaxation, the LMA was inserted without the assistance of a laryngoscope or neuromuscular blocker. ⋯ Only AEP index discriminated between movers and non-movers with a prediction probability of 0.872. BIS, SEF and MF could not predict movement at LMA insertion. AEP index was the most reliable predictor of movement in response to LMA insertion.
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Case Reports
Epidural haematoma after removal of an epidural catheter in a patient receiving high-dose enoxaparin.
A patient developed an epidural haematoma 6 days after removal of an epidural catheter resulting in paraplegia and death. Insertion and removal of the epidural catheter during anticoagulation with prophylactic unfractionated heparin and subsequent administration of high-dose enoxaparin (Clexane), which commenced 3 days after catheter removal, were implicated.
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Editorial Comment
Central nerve block and thromboprophylaxis--is there a problem?