Figure 1. Epidural catheters associated with intravenous cannulation or unilateral sensory analgesia. *Total number of intravenous catheters. (dagger) Intravenous catheters that functioned well after manipulation. (double dagger) Total number of epidural catheters inserted > 2 cm associated with unilateral sensory analgesia. (section) Epidural catheters associated with unilateral sensory analgesia that functioned well after manipulation.