British journal of anaesthesia
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Clinical Trial
Effects of magnesium sulphate on cerebral haemodynamics in healthy volunteers: a transcranial Doppler study.
Magnesium is increasingly being considered as a neuroprotective agent. We aimed to study its effects on middle cerebral artery blood flow velocity (V(mca)), cerebral autoregulation and cerebral vascular reactivity to carbon dioxide (CRCO(2)) in healthy volunteers. ⋯ Infusion of magnesium sulphate, in a dose that doubles its concentration in plasma, does not affect V(mca), strength of autoregulation or CRCO(2) in healthy volunteers. However, it can be associated with nausea and hypotension.
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Randomized Controlled Trial Comparative Study Clinical Trial
Pre-emptive analgesic efficacy of tramadol compared with morphine after major abdominal surgery.
Studies of pre-emptive analgesia in humans have shown conflicting results. This prospective, randomized, double-blind, controlled study was designed to test the hypothesis that a reduction in postoperative morphine consumption can be achieved by tramadol administered after induction of anaesthesia. ⋯ Tramadol (1 mg kg(-1)), administered after induction of anaesthesia, offered equivalent postoperative pain relief, and similar recovery times and postoperative PCA morphine consumption compared with giving morphine 0.1 mg kg(-1). These results also suggest that presurgical exposure to systemic opioid analgesia may not result in clinically significant benefits .
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Randomized Controlled Trial Comparative Study Clinical Trial
Plasma substitution effects of a new hydroxyethyl starch HES 130/0.4 compared with HES 200/0.5 during and after extended acute normovolaemic haemodilution.
The volume expansion effect of a recently introduced hydroxyethyl starch, HES 130/0.4, was compared with the commonly used HES 200/0.5 after rapid infusion of a single large dose (up to 2 litres) administered during acute normovolaemic haemodilution (ANH). ⋯ This study demonstrates a good immediate and medium-term plasma volume substitution effect of HES 130 compared with HES 200. HES 130 could represent a suitable synthetic colloid for plasma volume substitution during extensive ANH.
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Randomized Controlled Trial Comparative Study Clinical Trial
Comparison of different quantitative sensory testing methods during remifentanil infusion in volunteers.
The aim of this study was to compare thermal and current sensory testing stimuli with respect to opioid responsiveness. ⋯ Both current (5 and 250 Hz) and heat sensory testing detected a significant analgesic effect of a remifentanil infusion compared with saline. There was more response to current testing.