Failure to obtain CSF on patients undergoing cesarean section, gynecologic, urologic, general surgical and orthopedic operation after second attempts were 2.6%(2/78), 11.8%(9/34), 5.6%(4/56), 4.5%(3/22) and 0%(0/10) respectively.

• 在 CSEA中腰穿无 CSF回流患者在妇科、产科、泌尿科、普外和骨科手术患者的失败率分别为 2 .；6%25 (2 /78)；11