A randomised trial of periprostatic local anaesthetic for transrectal biopsy

Increasingly transrectal ultrasound and biopsy is performed for the detection of prostate cancer. We have conducted a randomised trial to evaluate whether the addition of periprostatic local anaesthetic injection reduces the discomfort of the procedure. A total of 64 patients who attended a specialised prostate clinic and were being evaluated for an elevated prostate-specific antigen agreed to participate in the trial and were randomly allocated to two groups. The intervention group received 10 ml of 1% lignocaine in the periprostatic tissue prior to biopsy and the control group underwent a standard biopsy. All patients had a sextant biopsy under ultrasound guidance. After the procedure, they were asked to determine the severity of the pain on a scale of 0-10 and the whether the quality of the pain was mild, moderate or severe. The responses were distributed normally. The groups were compared using Student's t-test. Pain severity showed no significant difference between the two groups (P=0.14). There was a trend towards a statistical difference (P=0.07) on the qualitative pain scale. In conclusion, no significant difference in overall discomfort in men having sextant biopsies was detected between the two groups, suggesting that the administration of local anaesthetic may not be as valuable as early reports have suggested.