Abstract
The records of a consecutive series of 920 cases of continuous lumbar epidural analgesia for the control of pain in labour were examined to ascertain the incidence of unilateral block and unblocked segments. An unblocked segment was noted to have occurred in 6.7 per cent of patients and was persistent in 1.5 per cent of patients. Unilateral block occurred in 1.5 per cent of patients, being persistent in 0.54 per cent.

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