Perineal Support and Lateral Episiotomy Reduced Birth Injury in a 15-Year Study

This study looked at whether a package of perineal support and a specific type of episiotomy (a cut to widen the birth opening) could reduce severe tears during childbirth in women giving birth vaginally for the first time.

🔬 What the study did

Researchers compared birth injury rates before (1999-2006) and after (2007-2021) a hospital in Norway introduced a program of active perineal support and lateral episiotomy. They studied over 15 years of records from women with a single baby in head-first position at full term who had not had a previous cesarean. The main outcome was the rate of obstetric anal sphincter injury (OASIS), a severe tear.

📊 What it found

• OASIS rates dropped from 4.9% before the program to 1.9% after.
• Episiotomy rates increased from 14.4% to 21.8%.
• In first-time mothers with forceps or vacuum delivery, lateral episiotomy was linked to lower OASIS: 3.4% vs 10.1% for head-front position.
• For first-time mothers with spontaneous delivery and head-front position, OASIS was 2.1% with episiotomy vs 3.2% without.
• Confounders like maternal age and epidural had little effect on the results.

🔍 What the study does NOT show

• It does not prove that perineal support or episiotomy caused the reduction.
• It did not study women with previous cesarean or multiple babies.
• Long-term outcomes for mothers or babies were not measured.

The study tested a specific hospital program. It does not claim that lateral episiotomy alone is always beneficial or that the same results would occur in other settings.

📋 Evidence level

A historical cohort study in people.

⚖️ Confidence indicator

Confidence: Low to moderate — observational design limits certainty.

🤔 How much to trust it

Trust tier: Moderate. This is an observational human study — it shows association, not proof of cause. The long follow-up and adjustment for confounders strengthen the findings, but unmeasured factors could still explain the results.

⚠️ Limitations

• Observational design cannot rule out other changes over time.
• Single hospital in Norway limits generalizability.
• No blinding or randomization.

❓ Open questions

• Would the same program work in hospitals with different practices?
• What are the long-term effects on pelvic floor function?
• How much of the benefit came from perineal support vs episiotomy?

✅ Your action plan

• ✅ Discuss birth injury prevention options with your healthcare provider.
• ✅ If you are pregnant, ask about perineal support techniques.
• ✅ Understand that this study shows an association, not a guaranteed outcome.
• ✅ Do not request an episiotomy based on this study alone.

💡 Takeaway

A 15-year hospital program using perineal support and lateral episiotomy was linked to fewer severe birth tears, especially in first-time mothers with assisted deliveries.

This summary is for general information only and is not medical advice. Talk to a qualified professional before changing anything about your health.

📚 Source

Prevention of obstetric anal sphincter injuries with perineal support and lateral episiotomy: A historical cohort study.. Acta obstetricia et gynecologica Scandinavica. 2024 PubMed

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