Der Anaesthesist
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Randomized Controlled Trial Comparative Study Clinical Trial
[Postoperative analgesia with tramadol. Continuous infusion versus repetitive bolus administration].
Postoperative pain relief can be achieved by several methods, including the use of systemic opioids and regional anaesthesia with intrathecal or epidural opioids or local anaesthetics. On-demand analgesia using a PCA (patient-controlled analgesia) system is regarded as the ideal option for systemic opioid analgesia. While PCA devices are not yet commonly used in all recovery units, the use of repetitive boluses on demand is still the most frequent form of administration in postoperative pain therapy. ⋯ Six hours after surgery, when analgesia was evaluated by the patients, there was no significant difference between the two groups. Not until the maintenance infusion had been administered for a further 18 h, was the tramadol consumption within the infusion group significantly higher. Thus, we should consider continuing unreduced administration of the maintenance infusion 6 h after operation.
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The classification of neuromuscular diseases with regard to the use of muscle relaxants is based on the localisation of the particular abnormality. Three types of syndromes can be differentiated: (1) denervation states; (2) disturbances of neuromuscular transmission; and (3) intracellular disease. Succinylcholine should be avoided in all types of denervation syndrome due to the possibility of life-threatening hyperkalaemia. ⋯ Patients with a primary myopathy may display increased sensitivity to non-depolarising muscle relaxants. The use of drugs with acetylcholine-like actions (succinylcholine, reversal agents) should be avoided due to the danger of triggering muscle spasms in patients with myotonic disease and the risk of rhabdomyolysis in patients with dystrophic muscle disease. Irrespective of the type of muscle disease present, titration of the dose of muscle relaxant should always be done using a nerve stimulator.(ABSTRACT TRUNCATED AT 250 WORDS)
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Randomized Controlled Trial Clinical Trial
[Anesthesia with flunitrazepam/fentanyl and isoflurane/fentanyl. Unconscious perception and mid-latency auditory evoked potentials].
There is a high incidence of intraoperative awareness during cardiac surgery. Mid-latency auditory evoked potentials (MLAEP) reflect the primary cortical processing of auditory stimuli. In the present study, we investigated MLAEP and explicit and implicit memory for information presented during cardiac anaesthesia. ⋯ During general anaesthesia auditory information can be processed and remembered postoperatively by an implicit memory function, when the electrophysiological conditions of primary cortical stimuli processing is preserved. Implicit memory can be observed more often when high-dose opioid analgesia is combined with receptor-binding agents like the benzodiazepines than under non-specific anaesthetics like isoflurane. Non-specific anaesthetics seem to provide a more effective suppression of auditory stimuli processing than receptor-specific agents.
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Recent studies and reviews continue to report a high mortality associated with the acute respiratory distress syndrome (ARDS), which involves a severe inflammatory reaction within the whole lung that is frequently associated with multiple-organ failure. Important factors contributing to the poor results in severe ARDS are the aggressive procedures required to maintain sufficient arterial oxygenation, such as mechanical ventilation with high inspiratory pressures and high inspired oxygen concentrations (FiO2) which themselves contribute to the progression of the disease. As no specific therapy that reduces or prevents the general inflammatory reaction is known, current therapy is limited to procedures that minimize peak inspiratory pressures and FiO2. ⋯ From April 1989 to August 1993, 89 patients were transferred to our intensive care unit for treatment of severe ARDS; 52 were treated by combining the described conventional methods without artificial gas exchange (survival rate 88%) and 37 additionally underwent artificial gas exchange (survival rate 57%). The overall survival rate was 75%. On the basis of these experiences, we conclude that this step-by-step approach may improve survival in patients with severe ARDS.
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There are two types of diabetes mellitus. Type I, insulin-dependent diabetes (IDDM), which becomes manifest before the age of 40, is the result of an absolute deficiency of insulin. Type II, the non-insulin-dependent diabetes (NIDDM), develops in the elderly and is caused by a relative insulin deficiency. ⋯ For hyperglycaemia and acidosis insulin (3-6 U.h-1) with 10-20 mmol.h-1 potassium phosphate is given. Bicarbonate is only indicated when the serum pH is lower than 7.1. It must be borne in mind that perioperative management of diabetes does not end with postanaesthesia care.