Chapter 20: Diagnostic investigations
Skip chapter table of contents and go to main content
20.3 Transrectal ultrasound (TRUS) prostate biopsy
Essential equipment
- Biopsy gun
- Long spinal needles (to administer anaesthetic) – 20 cm
- Ultrasound probe cover (condom)
- Specimen pots – pre‐labelled
- Lubricating jelly
- Wipes/gauze
- Non‐sterile gloves
- Needle guide to accommodate biopsy gun gauge
- Sharps bin
- Pathology sponges
- Pathology cassettes
- Sterile gloves
- Sterile gown
Medicinal products
- Antibiotic prophylaxis – patient specific (if not previously administered)
- Local anaesthetic – lidocaine 1% (10 mL)
Pre‐procedure
ActionRationale
- 1.Check the environment, equipment and medication to ensure that everything is present for the procedure, including access to relevant personnel and emergency equipment.
- 2.Ask assistant to set up trolley with sterile urology pack and in date sterile equipment.
- 3.Prepare the ultrasound machine by ensuring it is clean and prepare the probe by inserting some ultrasound gel into the end of the condom then roll the condom over the probe and carefully attach the needle guide without splitting the condom.
- 4.Read the patient's record, referral letter and the results of any relevant investigations and identify any special instructions, investigations or items for which you need to seek advice or clarification.
- 5.Greet and accurately identify the patient and introduce yourself and any colleagues present.
- 6.Take a written consent using a dedicated consent form in which the following should be discussed with the patient:
- how the biopsy is taken
- the risks and benefits of the procedure, potential complications of the procedure and whether the risk is major or minor
- the number of cores that will be taken
- if any additional cores will be taken using MRI fusion.
- 7.Ensure the patient has removed clothing below the waist and offer a gown.
- 8.Ensure the patient has taken antibiotic prophylaxis as prescribed locally.
- 9.Position the patient correctly for the procedure (left lateral position ensuring that the knees are bent up towards the chest) and ensure their comfort within the constraints of the procedure, taking appropriate action to protect the patient's privacy and dignity throughout.
- 10.Wash and dry hands using a bactericidal soap and apply non‐sterile gloves.
- 11.Undertake a digital rectal examination to identify symmetry, size, the presence of nodules, and tenderness and pain associated with the prostate. Careful attention should also be paid to exclude the presence of anal pathology or any other anomalies that may influence the procedure.
- 12.Remove gloves and dispose of them. Wash and dry hands.
- 13.Apply non‐sterile gloves and check the local anaesthetic agent to be used then draw up required volume into a syringe and attach the spinal needle ready for administration (the use of intrarectal lidocaine gel is optional).
Procedure
- 14.Apply lubricating gel to the covered TRUS probe and insert the probe gently into the patient's rectum, whilst monitoring progress on the ultrasound image.
- 15.Scan and identify the prostate gland, seminal vesicles and surrounding structures, locating the apex and base of the prostate on the ultrasound image. The prostate volume should be measured in three dimensions. In the transverse view:Final volume can be calculated using the formula: H × W × L × 0.52.
- anterior to posterior (width)
- height and, in the longitudinal plane,
- from the bladder neck to the apex (length).
- 16.Take volume measurements and make note of any abnormalities detected on ultrasound and either print images or store them on the ultrasound machine for future reference.To provide information that may be useful when discussing treatment options with the patient in the future. E.
- 17.Inform the patient that the local anaesthetic is about to be administered.
- 18.Introduce the local anaesthetic needle through the biopsy channel of the ultrasound probe until the needle tip can be visualized on the screen in the peri‐prostatic tissue.
- 19.Commence infiltration of the local anaesthetic observing the passage of the fluid throughout the peri‐prostatic area.Ultrasound‐guided peri‐prostatic block is standard. It does not make any difference whether the depot is apical or basal as long as it is given into Denonvilliers’ fascia. In addition, an intrarectal instillation of local anaesthetic can be done (Raber et al. [124], R1b; Yun et al. [177], R1b) at the discretion of the examiner. However, it should not be used as an isolated method as it is inferior to the peri‐prostatic block (Lee and Woo [90], R1a).
- 20.Withdraw the needle and discard into a large 5 litre sharps bin.
- 21.Identify the appropriate locations for the biopsy samples according to clinical need, e.g. MRI findings, DRE findings or confidence in diagnosis of cancer.
- 22.Introduce the biopsy needle along the biopsy channel until the needle tip can be visualized on the screen in the peri‐prostatic tissue, adjacent to the target area.
- 23.Inform the patient that the biopsy is about to be taken and warn them of the sound of the biopsy gun (sounds like a staple gun) and commence taking tissue samples.
- 24.Fire the biopsy gun and then withdraw it after firing on each occasion, in order to lay each tissue sample onto a sponge (a maximum of two per sponge). Repeat process.Lay a second sponge on top of the first after two samples have been taken.
- 25.Ensure that the samples taken are adequate for histopathology by comparing the length of the core with the length of the needle notch.
- 26.Take additional samples only where there is clinical concern, e.g. abnormality found on DRE or seen on ultrasound or MRI.
- 27.Assess the patient's tolerance throughout the procedure and ensure they are happy to continue.To ensure patient comfort. E.
- 28.Direct the assisting nurse to place each sponge sandwich into a cassette before inserting into a correctly and accurately pre‐labelled sample container containing 10% formalin.
- 29.Remove the TRUS probe from the patient's rectum and insert prophylactic antibiotic if indicated by local policy.
Post‐procedure
- 30.Wipe rectum, offer a surgical pad to protect the patients underwear and remove and discard glovesTo promote patient comfort. E.
- 31.Assist the patient into a sitting position.To promote patient comfort. E.
- 32.Assess the patient for any complications and take appropriate action.
- 33.Recognize the need for immediate management of acute emergencies associated with the procedure and respond appropriately.
- 34.Assess the patient's needs following the procedure and offer any verbal support, as required.To promote patient comfort. E.
- 35.Ensure the patient has all required information and medication. Reiterate the possible complications and how they should be managed.
- 36.Assess the patient's fitness for discharge by ensuring patient has voided and there are no other adverse events.
- 37.Ensure the ultrasound probe is cleaned in line with local infection control policy.To ensure the safety of staff and patients. E.
- 38.Ensure that single‐use items and sharps are disposed of and that non‐disposable equipment is cleaned and/or sterilized.
- 39.Complete the histopathology request form ensuring it matches patient identity and includes all relevant clinical details, particularly relevant previous treatment, procedures and biopsies.
- 40.Record the details of the procedure in the patient's record, including details of the local anaesthetic and any medication given.
- 41.Ensure that steps are taken to inform any other relevant practitioners of the procedure and plan, e.g. GP.To ensure all relevant healthcare providers are informed of the procedure and its outcome. E.
- 42.Make the patient a follow‐up appointment to discuss the results of the biopsy (usually 1–2 weeks).
- 43.Recognize when you need help and/or seek advice from appropriate sources.