Allen P R, Johnson R W
Anaesthesia. 1979 Oct;34(9):874-6. doi: 10.1111/j.1365-2044.1979.tb08538.x.
An obstetric patient had a subarachnoid block during attempted extradural analgesia for labour. The sensory block extended to T1 and was accompanied by hypotension. The analgesia lasted 3 hr. after which sensory and motor function recovered quickly. The local anaesthetic agent used was 2% 2-chloroprocaine.