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OG35.{16-17,20} | ARM, Episiotomy Suturing and Urinary Catheterisation — SDL Guide (Part 3)
Simulated Practice and Skill Integration
These three obstetric procedures are taught using high-fidelity simulation models before supervised patient contact, because errors in the live clinical setting have immediate and serious consequences. Simulation training for obstetric procedural skills allows the learner to develop hand-eye coordination, muscle memory, and decision-making without patient risk. The educational evidence consistently shows that simulation-trained trainees make fewer errors and demonstrate greater procedural confidence when they first perform these procedures on patients under supervision compared with trainees who receive only observation-based training.
ARM simulation: performed on a pelvic mannequin with a membrane model that can be distended with fluid; the trainee practices bimanual engagement assessment before ARM, correct amnihook introduction alongside the fingers, controlled membrane rupture, and immediate cord-check with FHR interpretation.
Episiotomy suturing simulation: performed on a perineal suturing pad (synthetic tissue layers simulating vaginal mucosa, perineal muscle, and skin); the trainee practices identifying each layer, locking the first suture above the apex, creating a tension-free repair, and performing a per-rectum check after completion.
Catheterisation simulation: practiced on a urological female simulator; the trainee practices aseptic technique including non-touch principles, meatus identification (including in simulated postpartum oedema conditions), correct catheter advancement, balloon inflation, and catheter securing.
Common errors to avoid in simulation (that translate to patient safety):
- ARM: inserting the amnihook before the fingers are in place and the cord is confirmed absent
- Episiotomy: starting the suture at the visible cut edge rather than above the apex; placing sutures in the rectal mucosa
- Catheterisation: breaking the aseptic field by allowing contaminated items to contact the catheter; forcing the catheter against resistance
Ethical and consent considerations: all three procedures require the patient's informed consent — explain the indication, the technique, the expected sensation, and the risks. In a semi-emergency (slow labour, imminent severe tear, postpartum retention), a brief but clear explanation is still required. Documentation in the case notes must include indication, technique, and outcome.
SELF-CHECK
During urinary catheterisation of a postpartum woman, you advance the catheter 4 cm but no urine drains. The catheter appears to have entered easily. What is the most likely explanation and what should you do next?
A. The bladder is empty — remove the catheter as it is not needed
B. The catheter has been inadvertently inserted into the vagina — withdraw and re-identify the urethral meatus
C. The catheter balloon has been inflated too early — deflate and advance further
D. The catheter size is too large — change to a smaller Foley catheter
Reveal Answer
Answer: B. The catheter has been inadvertently inserted into the vagina — withdraw and re-identify the urethral meatus
The most common error in female catheterisation is insertion into the vagina rather than the urethra, which is particularly easy to make in postpartum women because oedema and displacement distort normal anatomy. The female urethra is only 3-4 cm long; a catheter inserted into the vagina will typically advance further without resistance and produce no urine. The correct response is to withdraw the catheter, discard it (it is now contaminated), and carefully re-identify the urethral meatus — which lies anterior to the vaginal opening — before attempting re-catheterisation with a new sterile catheter. An empty bladder (A) is unlikely if the indication was retention. Balloon inflation before urine flows (C) risks balloon inflation in the urethra and severe trauma.
Self-Assessment
Use the procedural checklists below to systematically evaluate your readiness for supervised clinical practice in ARM, episiotomy repair, and urinary catheterisation. Self-assessment against an explicit skills checklist is one of the most effective tools in procedural learning: it forces you to distinguish between steps you have rehearsed correctly and independently from those you have observed but not yet internalised. Research in obstetric procedural education demonstrates that trainees who self-assess before simulation sessions identify their gaps more accurately and progress to competency faster than those who rely on instructor feedback alone. Work through each item honestly before your next simulation session, and use the gaps to prioritise what to rehearse. Combine this self-assessment with direct observation of each procedure being performed correctly in simulation before your first supervised patient contact.
ARM checklist:
- [ ] Confirms fetal head engagement (≤2/5 palpable abdominally, station 0 or below) before proceeding
- [ ] Checks for cord presentation before rupturing membranes
- [ ] Guides amnihook alongside examining fingers, tip directed away from fetal head
- [ ] Achieves controlled membrane rupture with a small rent (not a slash)
- [ ] Observes and documents liquor colour (clear/meconium/blood-stained)
- [ ] Checks FHR immediately after ARM and palpates for cord prolapse
Episiotomy repair checklist:
- [ ] Identifies apex of vaginal incision and starts suture 0.5-1 cm above it
- [ ] Closes vaginal mucosa with continuous suture down to hymeneal ring
- [ ] Closes perineal muscles with interrupted bites obliterating dead space
- [ ] Closes skin with subcuticular continuous suture
- [ ] Performs mandatory PR examination after repair and confirms no suture in rectum
Urinary catheterisation checklist:
- [ ] Sets up sterile field correctly using ANTT
- [ ] Correctly identifies urethral meatus (not vaginal orifice)
- [ ] Advances catheter 5-7 cm until urine flows before inflating balloon
- [ ] Inflates balloon with 10 mL sterile water (not saline)
- [ ] Secures catheter to inner thigh; documents initial urine output