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‘Field’ anaesthesia for an ICU procedure

puncture. A total of 2068 lumbar extradural procedures were performed from the 1 January 1989 to 31 December 1990. Using the same categories of distance from skin to extradural space as Sutton and Linter, we found nearly the same results as indicated in the Table. The only difference (a 0% incidence of dural puncture in the ‘deep’ group) is clearly a chance effect as the absolute number of epidurals performed in this group is too low to assess a risk which may be as low as 0.5%. In contrast, it is interesting to see that the distribution of the depth of the extradural space, as well as the relative risk of dural puncture between the ‘shallow’ group and the ‘normal’ group are similar on both sides of the Channel!