What Causes Men Pain in Prostate Biopsy and Best Method to Alleviate It

2006-09-15 18:09

Prostate Biopsy Pain

Researchers at Mayo Clinic have evaluated the major sources of pain for some men during in-office prostate biopsy and an anesthetic method that can best lessen it. Findings will be presented in two abstracts Thursday at the annual meeting of the North Central Section of the American Urological Association in San Diego.

Most prostate biopsies are performed on men who have abnormal digital rectal exams or abnormally elevated prostate-specific antigen (PSA) tests to evaluate the potential presence of cancer.

"Prostate biopsy evokes significant anxiety for some men due to anticipated pain associated with the procedure," says Richard Ashley, M.D., Mayo Clinic urology resident and lead study investigator. "We also noted that it seemed more men had pain with their prostate biopsies than we would have liked, and we wanted to make this procedure as comfortable as possible."

The researchers found about 16 percent of men who undergo prostate biopsy experienced a moderate or higher level of pain - pain scores of 5 or more on a scale from 1 to 10. The injection of lidocaine to dull pain during the biopsy caused more pain than the insertion of the transrectal ultrasound probe, a small probe about the size of a cigar inserted into the rectum to produce images of the prostate gland during the biopsy. They also discovered that taking tissue samples in certain locations tested in a prostate biopsy were more likely to cause pain. Specifically, biopsy of the part of the prostate closest to the urethra, the prostate apex, was more painful than biopsy of the part closest to the bladder, the prostate base.

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"We found we cannot predict who will have higher levels of pain at the time of a prostate biopsy simply based on the patient's history and features," says Dr. Ashley. "We discovered the location of biopsy was the most predictive of higher pain scores - not age, body mass index, family history, presence of cancer, inflammation, whether a lump was palpable, or whether the prostate was large or small."

The investigators also found that anesthesia administered by direct infiltration of the prostate apex and the surrounding rectal tissues may provide better pain control during a prostate biopsy than other anesthetic methods.



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The best results for painless TRUS Biopsy is to instill 10 mls of 2% lidocaine viscous rectally wait 3 minutes , then scan the glan and measure the volume. Next perform the 442 block. This is done by injecting 4 milliliters of 2% lidocaine using a 24 g 7 inch spinal needle into the prostatic neurovascular bundles at the junction of the base and seminal vesicles. Care to aviod deep injection into the blood vessels causing systemic absorbion. Next is to inject 1 milliliter into the apex just lateral of the urethra. Most patients report a nearly painless biopsy.