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Obstetric Anal Sphincter Injury (OASI)

Released Date: 2025-01-01

Obstetric Anal Sphincter Injury (OASI) Treatment in India


Obstetric Anal Sphincter Injury (OASI)

Obstetric Anal Sphincter Injury (OASI) refers to trauma sustained by the anal sphincter complex during childbirth. It is a severe form of perineal tear that can have lasting physical and psychological effects if not diagnosed and treated promptly.

What is OASI Classification?

The OASI classification categorizes the extent of the injury into four grades, as per the Royal College of Obstetricians and Gynaecologists (RCOG):

Grade 1 : Injury to the vaginal mucosa and perineal skin only.

Grade 2 : Injury extends to the perineal muscles but spares the anal sphincter.

Grade 3 : Injury involves the anal sphincter complex and is further divided into:

  • 3a: Less than 50% of the external anal sphincter is torn.

  • 3b: More than 50% of the external anal sphincter is torn.

  • 3c: Both the external and internal anal sphincter are torn.

Grade 4 : Complete rupture of both the internal and external anal sphincters, including the rectal mucosa.

Diagnosis and Treatment

  • Physical Examination: A thorough examination immediately after delivery to assess the perineum and anal sphincter.

  • Endoanal Ultrasound: For complex cases, to determine the extent of the sphincter damage.

  • Anorectal Manometry: Measures the functional integrity of the anal sphincter complex.

Treatment Options

  • Immediate surgical repair under anesthesia.

  • Antibiotic prophylaxis to prevent infection.

  • Stool softeners and laxatives to minimize strain during bowel movements.

  • Physiotherapy for pelvic floor rehabilitation.

Risk Factors and Management

  • Primiparity: First vaginal delivery.

  • Instrumental Delivery: Use of forceps or vacuum.

  • Large Baby: Birth weight > 4 kg.

  • Prolonged Second Stage of Labor.

  • Episiotomy: Especially midline episiotomies.

Management 

  • Prevention: Proper perineal support during delivery.

  • Timely Diagnosis: Routine postpartum examination.

  • Education: Training healthcare providers on identifying and managing OASI.

  • Postnatal Care: Regular follow-ups to monitor healing and address symptoms.

Causes and Effects of Obstetric Anal Sphincter Injury

Causes

  • Mechanical Trauma: Excessive stretching of the perineum during childbirth.

  • Obstetric Interventions: Forceps and vacuum-assisted deliveries.

Effects

  • Short-Term: Pain, swelling, and discomfort during bowel movements.

  • Long-Term: Anal incontinence, sexual dysfunction, and psychological distress.

Surgical Options for OASI

  1. Primary Repair:

    • Performed immediately post-delivery using absorbable sutures.

  2. Delayed Repair:

    • For cases where initial repair was inadequate or symptoms persist.

  3. Sphincteroplasty:

    • Reconstructive surgery for chronic anal sphincter defects.

  4. Gracilis Muscle Transposition:

    • A complex surgical option for severe cases.

Symptoms of Obstetric Anal Sphincter Injury

  • Pain in the perineum and rectal area.

  • Difficulty or discomfort during bowel movements.

  • Incontinence of gas or stool.

  • Sexual dysfunction.

  • Emotional distress or postpartum depression.

FAQ: Obstetric Anal Sphincter Injury

Q: What is the most common cause of OASI?

A: The most common cause is vaginal delivery, particularly with instrumental assistance such as forceps or vacuum.

Q: How can OASI be prevented?

A: OASI prevention includes controlled delivery techniques, judicious use of episiotomies, and proper training for healthcare providers.

Q: Is OASI treatable?

A: Yes, OASI is treatable with prompt surgical intervention, physiotherapy, and ongoing care.

Q: Can OASI lead to long-term complications?

A: Without proper treatment, OASI can result in long-term complications such as anal incontinence and psychological effects.

Q: Who is at higher risk for OASI?

A: Women delivering their first baby vaginally, those with large babies, and those undergoing instrumental deliveries are at higher risk.

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