RT Journal Article SR Electronic T1 Postspinal Headache and Relationship of Needle Bevel to Longitudinal Dural Fibers JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 76 OP 81 DO 10.1136/rapm-00115550-198510020-00005 VO 10 IS 2 A1 Mihic, Drazen N. YR 1985 UL http://rapm.bmj.com/content/10/2/76.abstract AB The effect of needle bevel direction on the frequency of postspinal headache (PSH) was investigated in 482 patients undergoing spinal anesthesia. Ten of 62 patients in whom the spinal needle bevel was inserted perpendicular to the longitudinal dural fibers developed PSH. Among 420 patients who underwent parallel insertion only one developed PSH. A system of criteria for registering PSH is proposed. The way of puncturing the dura was found to be a much more important factor influencing the occurrence of PSH than the needle size (22- versus 25-gauge needles), age, sex, or duration of postoperative recumbency.