Affiliation: | J.B. Mitchell, MB, BS, FRCAnaes, Registrar, Department of Anaesthesia, St Mary's Hospital, Praed Street, London W2 1NY.;P.M. Ward, BSc, MB, BS, FRCAnaes, Senior Registrar, Department of Anaesthesia, St Mary's Hospital, Praed Street, London W2 1NY. |