Der Anaesthesist
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In 60%-90% of cases head injury is a part of multisystem trauma and of very decisive importance for the post-traumatic prognosis. Hypoxia, hypercarbia, and hypotension increase the primary lesion and cause secondary brain damage. Therefore, emergency measures must be directed to the essentials of sustaining vital functions, i.e. intubation/ventilation/oxygenation and stabilization of the circulatory system. ⋯ Anesthesia in patients with severe head injury must involve only those techniques that do not further increase an already elevated intracranial pressure. As inhalational anesthetics, including nitrous oxide, elevate the intracranial pressure to varying extents due to cerebral vasodilation with a concomitant rise in intracranial blood volume, these substances have to be avoided whenever raised intracranial pressure cannot be excluded. Narcotics, benzodiazepines, small dosages of barbiturates, and long-lasting muscle relaxants can be regarded as useful.
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To study the problem of rapid antagonization of an intubation dose of vecuronium (0.08 mg/kg), 36 surgical patients undergoing barbiturate/halothane anesthesia were given edrophonium 0.5, 0.75, and 1.0 mg/kg or neostigmine 0.04, 0.06, and 0.08 mg/kg precisely 5 min following injection of the muscle relaxant. T1 twitch (T1/Tc) and train-of-four (TOF) ratios (T4/T1) of the hypothenar muscle were monitored every 20 s with the aid of a commercially available EMG monitor (Datex-Relaxograph). As documented by T1 and T4/T1 follow-up curves (Figs. 1 and 2) and derived parameters of relaxation as well (Dur25, Dur50, Dur75, recovery index, and reversal time; Table 4), both edrophonium and neostigmine resulted in a significantly shorter duration of vecuronium blockade (P less than 0.001). ⋯ Recurarization did not occur. Differences between drugs and dose-dependent effects were minimal; edrophonium did not prove superior to neostigmine with the exception of less pronounced muscarinic side effects, hence less bradycardia and a minimum heart rate of 57 +/- 8.2 bpm 20 min after the injection of neostigmine as opposed to 72 +/- 8.2 bpm following edrophonium (P less than 0.05; Fig. 4). As to the restitution of a ventilatory force sufficient to allow spontaneous breathing, no definite conclusions can be made.(ABSTRACT TRUNCATED AT 250 WORDS)