“…7 51 52 66 Several bradycardic episodes resolved spontaneously. The longest duration of asystole in surviving patients was 45 s. 64 Several factors, alone or in combination, were coincident with bradycardic complications during propofol anaesthesia and were therefore suspected in the original reports to be jointly responsible for the negative outcome: surgical stimulation, 9 36 lack of surgical stimulation, 63 67 extradural anaesthesia, 51 previous syncope, 7 64 67 preoperative conduction abnormalities, 57 71 fentanyl, 8 63 65 suxamethonium, 35 62 65 atracurium, 8 beta-blocker, 61 70 ornipressin, 8 neostigmine, 70 any factors or drugs potentiating vagal stimulation, 19 68-70 72 73 absence of vagal stimulation, 63 too light anaesthesia, 76 insufficient prophylactic dose of atropine 48 50 and an individual susceptibility to propofol. 63 65 Most authors concluded that a prophylactic anticholinergic may be indicated in the presence of any risk factor if propofol is to be used.…”