“…Numerous reports have appeared in the American and Canadian literature on the use of these drugs in anaesthesia. In this country, the published reports have concerned either the use of the neuroleptanalgesic state in specialized forms of anaesthesia (Larson, 1963;Brown, 1964;Smith and Hollis, 1966;Cameron, 1967;Baskett et al, 1969;Kay, Keaney and Taylor, 1970;Monks and Lumley, 1972) or on the physiological effects resulting (Fitch et al, 1969;Hollmen et al, 1966;Prys-Roberts and Kelman, 1967;Forbes et al, 1967;Barker et al, 1968;Oyama and Takiguchi, 1970).…”