One of the major concerns with epidural anesthesia in labor setting is the inability to produce an intensive analgesia or adequate level to proceed with cesarean section. The incidence of this event is rather various among reports, reflecting variability in definitions, authors' clinical judgment and perception, practice parameters, hospital settings. In most of related studies, the term of incomplete block was used and defined as (1) unilateral block; (2) unblocked sacral segments; (3) low level; (4) unblocked segments or a patchy block. 1Reported incidence of inadequate analgesia/anesthesia was 18% to 31.8%. In addition, the reported incidence of intraoperative discomfort/visceral pain was from 10% to 56%.1