Anaesthesia
-
We modified a Penlon Nuffield 200 for use in a monoplace hyperbaric oxygen chamber by feeding back the chamber pressure to the reducing valve of the Nuffield 200. This provides a compensating mechanism, allowing the ventilator to deliver adequate tidal volumes at pressures of up to 3 atmospheres. We report the laboratory testing of the ventilator and our experience of ventilating two patients with carbon monoxide poisoning. Although compensation is not complete the modification is adequate for short-term clinical use in patients in whom the airway is compromised but who need hyperbaric oxygen therapy.
-
Experience of the use of the Cerebrotrac 2500 EEG monitor in 17 patients subjected to artificial ventilation in an intensive care unit is reported; seven were receiving continuous sedation with morphine, midazolam and propofol singly or in combination and 10 received both sedation and the neuromuscular blocking agent, atracurium. The processed EEG patterns could not be precisely correlated with a standard clinical scoring system but were useful in determining the adequacy of sedation, particularly when a muscle relaxant was used. ⋯ The ability to detect cerebral irritability or isolated epileptiform discharges using this apparatus is, however, questionable. The equipment was easy to use and robust; the running costs were 9.5p per hour.
-
Prothrombin time and activated partial thromboplastin time were measured in two groups of 30 patients each. Blood sampled from an arterial line after various discard volumes and from a central venous line were compared with direct venipuncture control samples. ⋯ The only exception was activated partial thromboplastin time in group 2 patients when the discard volume from the arterial line is only 2.5 ml above the deadspace volume of the connecting line. At least 5 ml of discard volume must be withdrawn before sampling, to obtain reliable results.
-
All trainee anaesthetists on the Northern Ireland training scheme were surveyed about the techniques they use when anaesthetising elective paediatric cases. We compared the practice of doctors with specialist paediatric training to that of others and discovered that trainees with specialist training were more likely (p less than 0.05) to admit parents during induction, but were less likely (p less than 0.05) to visit their patients pre-operatively and routinely to use suxamethonium. Other general findings were confusion over the re-use of halothane and extensive involvement of trainee anaesthetists in neonatal resuscitation.