Isoflurane for sedation in a case of congenital myasthenia gravis.

We describe the use of isoflurane for the management of a 3-yr-old boy with congenital myasthenia gravis who required ventilation for pneumonia. While in the intensive care unit he was sedated with isoflurane for 5 days (81 MAC-h). This provided a safe, easily controllable method of sedation which avoided the use of neuromuscular blocking agents and appeared to have no significant side effects during use. However, after it was stopped the patient developed a fine, self-limiting tremor which lasted for 2 days. Previous reports of paediatric patients sedated with isoflurane suggest that prolonged exposure may result in temporary dose-dependent neurological dysfunction, including hallucinations, ataxia and non-purposeful movements.

Cardiovascular responses to tracheal intubation: a comparison of direct laryngoscopy and fibreoptic intubation.

The cardiovascular responses to tracheal intubation using a fibreoptic bronchoscope or Macintosh laryngoscope were compared in twenty in-patients and twenty day-stay patients. Within these groups patients were randomly allocated to direct laryngoscopic or fibreoptic bronchoscopic intubation. Arterial blood pressure, heart rate and arterial oxygen saturation were recorded before induction and at one-minute intervals until four minutes after intubation. In both groups both laryngoscopic and bronchoscopic intubation resulted in a significant rise in blood pressure and heart rate. At no stage was there a significant difference in mean blood pressure in either group, or in heart rate in the day-stay patients, between the different methods of intubation. In the in-patients mean heart rate was significantly higher in those patients intubated with the bronchoscope at three and four minutes after intubation. Time taken for intubation was significantly longer in those patients intubated with the bronchoscope. In no patient did the arterial oxygen saturation fall below 98%.