Patient selection
rash
Between January 2018 and December 2019, 116 HZ patients who underwent PRF were enrolled at Wuhan No. 1 Hospital. All patients were randomized 1:1 in the study (Figure Flow diagram for the study.The DRG position and needle tip position. Lines A and B are lines connecting the adjacent medial and lateral margins of the pedicle. IP group: the final needle tip was located between lines A and B; OP group: the final needle tip was located lateral to line A. DRG, dorsal root ganglion; P, pedicle.The sample size was calculated by G power software (version 3.1), with a two‐sided 0.05 significance level and assuming an error of 5%. According to the reduced VAS scores and the effectiveness of PRF therapy (80% statistical power), a minimum of 35 patients per group were required.The study was conducted in accordance with the principles of the Declaration of Helsinki and the guidelines of Wuhan No. 1 Hospital. All patients were asked to sign an informed consent document. The diagnosis of HZ was based on typical manifestations such as a vesicular, painful dermatomal rash.