Previous obstetric anal sphincter injury: counselling at 34 weeks

The information she has given is not enough to counsel her, and counselling on a partial history is how women end up with decisions made for them.

What I need

• Exact classification and repair: 3b versus 3c or 4th degree, and who repaired it. A 4th-degree tear or a 3c carries a higher risk of sphincter defect and of recurrence than an isolated 3b repaired by an experienced operator.
• Current symptoms: is she truly asymptomatic, or has she adapted her life around urgency, and does she have any incontinence of flatus or stool now? Asymptomatic at 20 months is different from 'better but I don't trust myself on a long journey'.
• Any endoanal ultrasound or colorectal/pelvic floor assessment, and whether she was seen in a perineal clinic. A symptomatic or ultrasound-demonstrated defect substantially changes the recommendation.
• The first birth in detail: length of second stage, position at delivery, whether episiotomy was performed and its type, shoulder dystocia, birthweight, and whether she was induced or augmented.
• This pregnancy: estimated fetal weight and growth trend, presentation, any comorbidity, and the distance from home to the unit - relevant to her home birth request.
• Her mental state: nightmares, flashbacks, avoidance of the pregnancy - this is a birth trauma picture and needs its own pathway, not a footnote.

Why it matters The recurrence risk for a further third- or fourth-degree tear is around 5–7% in the literature, but that figure is a population average. A woman with a previous 4th-degree tear and persistent symptoms is not the average, and quoting the population figure to her without qualification would be misleading. The same number leads to different advice depending on which woman is in front of me.

Structure the conversation around her goals, not the mode of birth

• Ask first what she is most afraid of and what a good outcome would look like for her. Her answer will tell you whether the driver is pain, injury, loss of control, or the memory of the theatre repair.
• Set out the options honestly: planned caesarean, planned vaginal birth in an obstetric unit with an active perineal protection plan, and induction discussion if she reaches term with a large baby.
• Planned caesarean avoids recurrence of OASIS at that birth, but it is not protective in the longer term and carries its own risks: longer recovery with a toddler, infection, thromboembolism, implications for future pregnancies and placenta accreta risk with repeat caesareans, and a small risk of surgical injury to the baby. Some women still have pelvic floor symptoms after caesarean.
• Vaginal birth carries the recurrence risk above, which can be reduced but not abolished by warm perineal compresses, controlled birth of the head, hands-on or poised support, mediolateral episiotomy only when indicated, and avoiding instruments where possible.
• Be explicit that this is a decision for her, that a consultant obstetrician should be involved, and that she can change her mind at any point.
• Do not say 'we'll let you' about any option - she is not asking permission.

The home birth request With a previous 3b tear and significant birth fear, home birth is not the safe first suggestion, but the request is information: she is telling you she wants continuity and a birth she is not frightened of. Redirect to what can be delivered - continuity of carer, a named midwife at the birth, a detailed birth plan, early epidural discussion, and a debrief of the first birth - rather than simply refusing.

Reasoning: the counselling standard is informed choice, which means giving the numbers, the uncertainty around them, and the alternatives, then supporting the woman's decision.

Immediate plan

1. Book a consultant obstetric review before 36 weeks to discuss mode of birth, with a written summary of the first birth requested from the previous trust - the classification and operative note must be in the notes, not in her memory.
2. Refer to a perineal/pelvic floor clinic for assessment, including endoanal ultrasound if available, irrespective of her current symptoms.
3. Refer to perinatal mental health for the birth trauma symptoms - nightmares and avoidance at 34 weeks are treatable and untreated fear affects labour progress and her postnatal mental health.
4. Offer a birth debrief of the first birth with a senior midwife, with her consent.
5. Agree an interim plan she can live with: place of birth to be confirmed after consultant review, with the default being an obstetric unit until then.
6. Continuity: allocate to the continuity team and make sure the same midwife is at the next appointment.

Documentation

• Her exact words about her wishes and fears, in quotation marks.
• The first birth details as known, and the fact that the records have been requested.
• The risks and benefits discussed for each option, including the recurrence figure and its limits, and the caesarean risks.
• That the decision is not yet made, who will be involved, and the review date.
• Referrals made, with consent.

Reasoning: the evaluation loop here is that a woman who is frightened and undecided at 34 weeks must leave with a named plan, a date, and a route back to the same midwife - not with an open question and a leaflet.