Genital tract trauma repair

Etiology & Risks - The Tear Factors

• Maternal Factors:
  • Primiparity (first delivery)
  • Precipitous labor (< 3 hours)
  • Previous perineal scarring (e.g., FGM, prior tear)
• Fetal Factors:
  • Macrosomia (birth weight > 4 kg)
  • Abnormal presentation (e.g., occiput posterior)
• Intrapartum Events:
  • Operative vaginal delivery (forceps > vacuum)
  • Episiotomy (especially midline)
  • Prolonged second stage of labor

⭐ Midline episiotomy, while easier to repair and less painful, carries a higher risk of extension into the anal sphincter (3rd/4th-degree tears) than mediolateral episiotomy.

Classification - Degrees of Damage

Describes perineal tears sustained during vaginal delivery. Accurate classification is critical for appropriate management and prognosis.

• 1st Degree: Injury to perineal skin and/or vaginal mucosa only.
• 2nd Degree: Injury extends to the muscles of the perineal body, but the anal sphincter remains intact.
• 3rd Degree: Injury involves the anal sphincter complex.
  • 3a: Less than 50% of the external anal sphincter (EAS) thickness is torn.
  • 3b: More than 50% of the EAS thickness is torn.
  • 3c: Both EAS and internal anal sphincter (IAS) are torn.
• 4th Degree: Injury extends through the entire anal sphincter complex (EAS and IAS) and into the rectal mucosa.

⭐ Proper identification and repair of third and fourth-degree tears are crucial to minimize the risk of future anal incontinence.

Repair Techniques - Stitching Strategy

• Primary Goal: Achieve hemostasis and reapproximate tissue layers anatomically without tension.
• Suture Material: Use absorbable sutures.
  • 2-0 or 3-0 polyglactin 910 (Vicryl) or similar synthetic suture is standard.
  • Chromic gut is an alternative but may cause more tissue reaction.
• Core Technique:
  • Anchor Above the Apex: The initial stitch must be placed ~1 cm proximal to the apex of the laceration to ligate the retracting artery, preventing hematoma formation.
  • Continuous Suture: Generally preferred for vaginal mucosa and muscle layers. It's faster and uses less suture material.
    • Non-locking: Standard for most of the repair to maintain tissue perfusion.
    • Locking: Use selectively for improved hemostasis, especially at the apex or for brisk bleeding.

⭐ Failure to identify and secure the apex of a vaginal tear is a primary cause of postpartum hematoma formation and continued bleeding. Always ensure adequate visualization.

Post-Op & Complications - Healing Hurdles

• Infection:
  • Signs: ↑pain, fever, purulent discharge, erythema.
  • Prophylactic antibiotics for 3rd/4th degree tears.
• Wound Dehiscence:
  • Breakdown of repair.
  • Risks: infection, hematoma, poor surgical technique.
• Hematoma Formation:
  • Severe pain, swelling, palpable mass.
  • Small: conservative (ice, analgesia).
  • Large (>5 cm) or expanding: surgical evacuation.
• Pain Control: NSAIDs, sitz baths.

⭐ Infected Dehiscence: Do not re-suture immediately. Allow drainage & granulation (secondary intention), then consider delayed repair.

High‑Yield Points - ⚡ Biggest Takeaways

• Suspect genital tract trauma when there is persistent bleeding despite a firm, contracted uterus.
• A systematic examination of the perineum, vagina, and cervix is crucial for diagnosis.
• Cervical lacerations most commonly occur at the 3 and 9 o'clock positions.
• Fourth-degree tears involve the rectal mucosa and require meticulous, layered repair to prevent fistulas.
• Expanding hematomas can present as severe pain and pressure with minimal visible bleeding.