The frequency and severity of intracranial hypotension post-intraoperative lumbar drainage using a Tuohy needle and the traditional needle.

Background Intraoperative lumbar cerebrospinal fluid (CSF) drainage is a well-recognised technique in cranial and vascular surgery. The goal of the study was to assess the frequency and severity of intracranial hypotension post-intraoperative lumbar drainage performed using two different techniques, a 14G Tuohy needle versus an 18G traditional needle. Methods The medical records and imaging studies of 94 patients who had undergone open cranial operation were retrospectively studied: 47 patients had intraoperative lumbar drainage and 47 patients did not. A 14G Tuohy needle was employed in 27 (57.4%) patients and an 18G traditional needle was employed in 20 (42.6%) patients. Results There were signs of intracranial hypotension on MR images in nine (19.1%) patients who had intraoperative lumbar CSF drainage; none of the patients in the control group exhibited the MR signs of intracranial hypotension. A 14G needle was used in 6/9 patients and resulted in severe complications: one patient developed a delayed intracranial epidural hematoma that required emergency evacuation and a blood patch. Another patient developed somnolence that required two epidural blood patches and a third patient had protracted headaches. The 18G needle was used in the remaining 3/9 patients who were asymptomatic or presented with mild headaches. Conclusion The use of the smaller 18G traditional needle was associated with better outcomes with regards to intracranial hypotension, and the frequency of severe complications was higher with the use of the 14G Tuohy needle.