British journal of anaesthesia
-
A theoretical analysis has been performed to show the interrelationships between alveolar carbon dioxide concentration, carbon dioxide output, alveolar ventilation and fresh gas flow during controlled ventilation with the Mapleson D system. The model and forms of equation used have been substantiated by experiments in which dogs were ventilated through a coaxial version of the Mapleson D system at varying levels of fresh gas flow and alveolar ventilation. By assuming that man ventilated with this system behaves as does the dog, a nomogram has been produced to predict alveolar carbon dioxide concentrations at any levels of fresh gas flow and minute volume.
-
Anaesthesia was given from a Boyle's apparatus to 100 patients, using compressed air as the carrier gas.
-
Randomized Controlled Trial Comparative Study Clinical Trial
Comparative anaesthetic properties of various local anaesthetic agents in extradural block for labour.
Various concentrations of lignocaine, etidocaine and bupivacaine in 10-ml doses of plain solutions were studied in a double-blind manner as agents for extradural analgesia to relieve the pain of labour. In 67 patients in established labour the onset time and duration of analgesia were assessed by the abolition and recurrence of the pain of uterine contractions, motor block on a 0-2 scale, dermatomal spread by pinprick testing, and arterial pressure by standard sphygmomanometry. Increasing the drug concentration reduced the onset times and increased both the duration of analgesia and the degree of motor block, but had little effect on dermatomal spread or on the frequency of hypotension. Based on the results the agents have been classified with regard to onset and duration of analgesia and degree of motor blockade.
-
A brief review of recent advances in the understanding and practive of obstetric anaesthesia and analgesia is presented. The failure to reduce maternal mortality associated with anaesthesia is related to laxity in the provision of anaesthetic services to obstetric units. The outstanding importance for the quality of life of infants and mothers, of a well-conducted obstetric anaesthetic and analgesic service is emphasized. Relating this to the needs of the community, it is claimed that the demands of obstetrics should have priority in the anaesthetic service, and that this requirement can and should be met by a redeployment of anaesthetic personnel, especially at consultant level.