Decapitation

Clinical Indications and Emergency Contexts

Decapitation is a rare, destructive obstetric procedure performed exclusively when a fetus is dead and vaginal delivery is obstructed due to an impacted transverse lie, most commonly with a neglected shoulder presentation. In modern midwifery practice across Nigeria, this operation is considered a measure of last resort. It is indicated only when safe Caesarean section is unavailable, carries prohibitive maternal risk due to severe sepsis, or when a second twin is locked or impacted in a transverse lie after the first twin has been delivered vaginally. The primary goal is to reduce the bulk of the fetus to allow safe vaginal delivery and prevent uterine rupture, saving the mother's life at a time when the fetus cannot be saved.

Essential Prerequisites and Surgical Preparation

Before any destructive operation begins, strict clinical conditions must be met to ensure maternal safety.

• Confirmed Demise: Absolute certainty of fetal death established via auscultation and ultrasound.
• Full Cervical Dilatation: The cervix must be fully dilated to prevent severe lacerations during instrument passage and traction.
• Empty Bladder: Catheterization is mandatory to minimize trauma to the urinary tract.
• Anesthesia and Analgesia: Adequate anesthesia and uterine relaxation must be achieved.
• Infection Control: Broad-spectrum prophylactic antibiotics must be administered, as neglected transverse lies carry a very high risk of chorioamnionitis and sepsis.

Specialized Instruments

The instruments used in decapitation are designed specifically to cut, crush, or hook fetal tissue within the confined space of the birth canal without injuring the maternal tissues.

• Blumont Decapitating Hook: A strong, curved metal rod with a sharp or blunt inner edge used to pull down and encircle the fetal neck.
• Farraby Decapitating Hook: Another variant used for applying traction around the neck.
• Heavy Long-Bladed Scissors: Used to cut through the soft tissues and cervical vertebrae if a hook is not employed.
• Embryotomy Wire Saw (Gandall Saw): A flexible wire saw passed around the neck to cleanly saw through the cervical spine.
• Vulsellum and Long Tissue Forceps: Used for grasping fetal parts and providing steady traction.

Step-by-Step Operative Technique

Executing a decapitation requires precision, excellent lighting, and a gentle touch to protect the maternal soft tissues.

1. Exposure: The patient is placed in the lithotomy position, and the vulva and vagina are thoroughly cleaned and draped.
2. Identification: The midwife or obstetrician identifies the fetal neck, shoulders, and arm using internal examination.
3. Passing the Hook or Wire: The decapitating hook or wire saw is guided along the palm of the hand to encircle the fetal neck securely.
4. Severing the Neck: Traction is applied while working the instrument to divide the soft tissues, blood vessels, and cervical vertebrae of the neck.
5. Extraction: Once the head is severed from the trunk, the body is delivered first by pulling on the prolapsed arm, followed separately by the detached head.

Delivery of the Trunk and Head

After the fetal neck has been successfully divided, managing the delivery of the remaining parts must be done systematically. The trunk is usually delivered first by applying downward traction on the prolapsed arm or by using a crotchet if necessary. Once the trunk is born, the separated head remains inside the uterine cavity or upper vagina. The midwife must locate the head, often using two fingers inside the mouth or by applying forceps or a vulsellum to the scalp, and deliver it gently with traction, ensuring no small bone fragments are left behind.

Post-Operative Maternal Care and Complications

The completion of a destructive operation marks the beginning of intensive post-operative surveillance. Midwives must monitor vital signs closely to detect early signs of postpartum hemorrhage and hypovolemic shock. Because obstructed labor frequently involves prolonged tissue compression, the mother is at high risk for genital tract necrosis, vesicovaginal fistula, and severe pelvic infection. Intravenous broad-spectrum antibiotics and aggressive fluid management must be maintained. Furthermore, the psychological impact of losing a baby following a traumatic, difficult delivery requires compassionate counseling and emotional support for both the mother and her family.