British journal of anaesthesia
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Spinal cord stimulation (SCS) is widely accepted as a useful treatment for patients with intractable chronic pain. However, its effectiveness varies between individuals. Therefore, a tool for evaluating its effectiveness in advance is eagerly awaited. We examined whether resting-state functional magnetic resonance imaging as a diagnostic and prognostic tool can predict responsiveness to SCS. ⋯ For patients with intractable chronic pain, functional connectivity between the middle anterior cingulate cortex and precuneus/posterior cingulate cortex is a promising candidate biomarker to estimate responsiveness to spinal cord stimulation before treatment.
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Optimal postoperative pain management is a prerequisite for enhancing functional recovery after surgery. However, many studies assessing analgesic interventions have limitations. Consequently, further improvements in study design are urgently needed. ⋯ Novel clinical trial designs should improve efficiency and enhance the likelihood of detecting relevant treatment effects. Cohort and database studies using propensity score matching and directed acyclic graphs could provide real-world generalisable information. Procedure-specific and patient-specific trials should allow identification of subpopulations most likely to benefit from a particular intervention after a specific surgical procedure and thus ascertain optimal analgesic strategies in challenging populations.
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Nonsteroidal anti-inflammatory drugs (NSAIDs) and cyclooxygenase (COX)-2-specific inhibitors provide significant analgesic and opioid-sparing benefits. However, these analgesics are commonly avoided owing to concerns of potential adverse effects. The evidence for NSAID-related adverse effects is conflicting and of poor quality, and these analgesics are safer than what has been implied. Thus, it is imperative that NSAIDs or COX-2-specific inhibitors are administered routinely unless there are well-founded contraindications.
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Aperiodic (nonoscillatory) electroencephalogram (EEG) activity can be characterised by its power spectral density, which decays according to an inverse power law. Previous studies reported a shift in the spectral exponent α from consciousness to unconsciousness. We investigated the impact of aperiodic EEG activity on parameters used for anaesthesia monitoring to test the hypothesis that aperiodic EEG activity carries information about the hypnotic component of general anaesthesia. ⋯ Aperiodic EEG activity could improve discrimination between consciousness and unconsciousness using spectral analyses.
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Anaesthesia has been shown to impair social functioning, but the underlying mechanisms remain largely unknown. The volatile anaesthetic isoflurane potentially disrupts the methionine cycle and trans-sulphuration pathway, contributing to social deficits. Cystathionine-β-synthase (CBS), a key enzyme in this pathway, might be targeted by isoflurane. We investigated the CBS-isoflurane interaction and its role in neuronal function and social behaviour. ⋯ These findings reveal a crucial role for CBS inhibition by isoflurane in anaesthesia-induced social impairment.