Figure 3. Cumulative survival of thoracic sensory anesthesia (A), lumbar sensory anesthesia (B), and lower extremity motor blockade (C) after combined spinal epidural anesthesia in the 40-, 60-, and 80-mg groups (all 90 patients). Duration of sensory and motor blockade was significantly longer in the 60- and 80-mg groups than the 40-mg group (P < 0.0002).