Examination Under Anaesthetic (EUA)

Overview

An examination under anaesthetic (EUA) is a short procedure where Mr Nguyen examines your anal canal, lower rectum, and the surrounding skin while you are under a general or spinal anaesthetic. With your muscles completely relaxed, he can feel, inspect, and assess areas that would be too painful or difficult to examine properly in the clinic. He may use a proctoscope (a small, lighted tube) and in some cases a flexible sigmoidoscope (a slender instrument that allows a view of the lower bowel). If he can treat what he finds in the same session — for example, draining an abscess, placing a fistula stitch, or taking a tissue sample — he will do so, meaning you do not need a separate operation.

Who needs this procedure?

• Your condition is too painful or complex to examine properly in the clinic — an EUA removes the discomfort completely so Mr Nguyen can see what is really going on
• You have an anal fistula (a tunnel connecting the inside of the anal canal to the skin) and Mr Nguyen needs to map out exactly where it goes — this is often combined with seton insertion, where a fine thread is placed through the fistula to begin treatment
• A lump or area of tissue inside the anal canal or rectum needs to be examined and possibly biopsied — a tissue sample can be taken during the EUA so you do not need a separate procedure
• You have a perianal abscess (a pocket of infection) that needs to be drained — the EUA allows both proper assessment and treatment at the same time
• You have rectal prolapse (where part of the bowel slides out through the anus) or a pelvic floor disorder that is easier to assess under anaesthetic
• You have Crohn's disease affecting the anal area — the EUA allows Mr Nguyen to map the full extent of the disease so the best treatment plan can be made

Benefits

• You are completely comfortable throughout — the examination is thorough precisely because you are not in pain and your muscles are fully relaxed
• Diagnosis and treatment often happen in the same session, so you wake up knowing what was found and, in many cases, already having had something done about it
• Complete muscle relaxation means Mr Nguyen can assess the full extent of the problem — something that is simply not possible in a clinic when the area is sore
• The EUA can be combined with endoanal ultrasound — an imaging scan done from inside the anal canal — to give a precise picture of a fistula's path
• One anaesthetic, one procedure, one recovery — rather than coming back for multiple separate visits
• If a biopsy is needed, the sample is taken accurately and sent to the laboratory for analysis

Risks & considerations

• Anaesthetic risks — both general and spinal anaesthetics are very safe for most people. Your anaesthetist will go through this with you beforehand and is there specifically to keep you safe throughout
• Minor bleeding from a biopsy — if a tissue sample is taken, a small amount of bleeding can occur, but this is uncommon and usually settles on its own
• Occasionally scarring from a previous infection or operation can make it harder to assess certain areas fully — if this happens, Mr Nguyen will discuss next steps with you
• If an additional procedure is performed during the EUA (such as a fistulotomy — dividing a fistula — or rubber band ligation of haemorrhoids), there are small risks specific to that treatment. Mr Nguyen will explain these before you sign your consent form

Before the procedure

• Depending on what Mr Nguyen is planning to do, you may need to do a bowel preparation — if so, his rooms will give you specific instructions. For a basic examination alone, preparation is usually not needed
• Please arrange for a responsible adult to drive you home and stay with you for the rest of the day after your anaesthetic — you will not be able to drive yourself
• Before your procedure, Mr Nguyen will talk you through exactly what he plans to do, answer any questions you have, and ask you to sign a consent form. If there is any chance he will need to do something additional — for example, place a fistula stitch — this will be explained to you beforehand

On the day

• You will be admitted to the day-stay unit at Warringal Private Hospital or Epworth Eastern, where the nursing team will get you settled and answer any last-minute questions
• Your anaesthetist will give you either a general anaesthetic (you will be fully asleep) or a spinal anaesthetic (you will be awake but numb from the waist down and completely comfortable) — whichever is most appropriate for you
• Mr Nguyen will then carry out a thorough examination of the anal canal, rectum, and surrounding area. You will be positioned to allow the best access while keeping you comfortable and dignified throughout
• He will use a proctoscope (a small lighted tube) and in some cases a flexible sigmoidoscope to look at the lining of the lower bowel — he carefully notes everything he finds
• Any planned treatments are carried out at the same time — this might include a biopsy, draining an abscess, placing a seton (a thread through a fistula), or rubber band ligation for haemorrhoids
• You will recover in the day-stay unit and, in most cases, go home the same day once you are comfortable and the nursing team is happy with how you are doing

Recovery & aftercare

• Day 0 (the day of your procedure): Rest at home for the remainder of the day. Some mild soreness around the anal area is normal and expected — take the pain relief you have been prescribed, and do not push yourself. The anaesthetic can leave you feeling a little groggy or tired, which is completely normal
• Day 1 onwards: Most people are back to their usual activities within a day or two if only an examination was performed. If an additional treatment was carried out during the EUA, recovery will depend on what was done — Mr Nguyen's team will give you specific guidance for your situation
• After the procedure, Mr Nguyen will have a clear picture of what is going on and will be able to discuss a treatment plan with you — whether that is reassurance, medication, or a planned operation. You will never be left wondering what was found
• A follow-up appointment is routinely arranged 2–6 weeks after your procedure so Mr Nguyen can go through the findings with you, discuss any biopsy results, and plan the next steps in your care — this review is provided at no charge

Related patient guides

In-depth articles written for patients and their families on topics related to this procedure.