“…In one instance of thiopentone apnoea (table IV) improvement followed nalorphine (Bourke and Zuck, 1957) but, while it is probable that opiates enhance respiratory depression, clearly thiopentone precipitates the apnoea. In the currently reported case, premedication was with lorazepam which, having a stimulatory effect on respiration (Vickers, Schnieden and Wood-Smith, 1984), is unlikely to have contributed to the apnoea.…”