ZONES OF DIFFERENTIAL SENSORY BLOCK DURING EXTRADURAL ANAESTHESIA

摘要: We have measured spinal segmental levels of anaesthesia to light touch (LT), pinprick (PP) and cold temperature discrimination (TE) during 2% lignocaine extradural in 22 patients, determine if zones differential sensory block develop and, so, the extent which TE extends beyond PP or LT how age affects block. The median thoracic dermatomal were 4.5 for LT, 2.0 TE. Zones developed within 5 min injection local anaesthetic, persisted next 55 min. In all instances, extended more cephalad than above levels. There no differences between two groups patients with mean ages 28 48 yr. Thus, anaesthesia, sympathetic denervation one segments (28 vs yr) affected neither nor width block, closer presumed