• Jian-Lan Zhao, Yi-Rui Sun, Qiao Shan, Zhi-Peng Xiao, Ben-Chao Hou, and Jin Hu.
• Department of Neurosurgery, Huashan Hospital.
• J Neurosurg Anesthesiol. 2019 Jul 1; 31 (3): 318-322.

BackgroundLumbar puncture (LP) is a medical procedure required during spinal anesthesia and for obtaining cerebrospinal fluid samples in the diagnosis of neurological disorders. The aim of this study was to assess the effects of physicians' handedness bias and the laterality of patients' recumbent position on the success rate of LPs.Methods And PatientsA prospective multicenter study including 36 physicians (18 left-handed and 18 right-handed) and 7200 patients was conducted in 6 medical centers. In each center, 1200 patients were randomized into group L (LPs performed by left-handed physicians) or group R (LPs performed by right-handed physicians). Each physician performed 200 cases of LPs, of which the laterality of the recumbent position (either on the left or right side) was decided after a second randomization. A successful LP was considered when the free flow of cerebrospinal fluid was observed upon the first attempt.ResultsThere was no significant difference in patient characteristics between groups L and R. Right-handed physicians had a significantly higher LP success rate with patients in the left lateral recumbent position (LRP) (1595/1800 vs. 1408/1800; odds ratio, 0.539; 95% confidence interval, 0.348-0.836; P=0.006). For left-handed physicians, the LP success rate was higher when patients were in the right LRP (1424/1800 vs. 1593/1800, odds ratio, 0.449; 95% confidence interval, 0.283-0.711; P=0.001). Patients' age, sex, height, and weight were not statistically related to LP success during multivariate analyses.ConclusionsPhysicians handedness bias and patient laterality of recumbent position affects the success of LPs. Right-handed physicians have a greater chance of performing successful LPs when patients are in the left LRP, and vice versa.

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