Vacuum extraction, also known as ventouse delivery, is an operative vaginal procedure designed to assist fetal expulsion using negative pressure applied via a specialized cup placed on the fetal head. Midwives practicing across Nigeria frequently encounter situations where the second stage of labor stalls, requiring safe intervention to avoid emergency cesarean sections.
Clinicians consider this procedure for several specific clinical scenarios:
Before applying a vacuum cup, strict prerequisites must be verified to prevent severe maternal and fetal trauma. Skipping any of these checks significantly increases the risk of operative failure and major complications.
Vacuum extraction is not suitable for every complicated delivery. Recognizing absolute contraindications protects both mother and baby from catastrophic injury.
Modern ventouse systems typically utilize silicone, silastic, or metal cups connected to a vacuum source via tubing. The choice of cup often depends on operator preference and the specific station of the fetal head.
When setting up, the midwife checks the pump and tubing to ensure steady negative pressure generation. During application, the center of the cup is placed over the flexion point—located about 3 centimeters in front of the posterior fontanelle along the sagittal suture. This placement promotes flexion of the fetal head as traction is applied, minimizing the diameter that must pass through the birth canal. Care must be taken to sweep maternal soft tissues away from the cup rim to avoid painful entrapment during suction creation.
Executing a ventouse delivery requires synchronized teamwork and patience. Once the cup is in position and confirmed, negative pressure is built up gradually—typically to 0.2 kg/cm² for a minute, then increased to operational levels around 0.6 to 0.8 kg/cm².
Traction must only be applied synchronously with maternal expulsive efforts during contractions. The line of pull must remain perpendicular to the plane of the cup, following the downward and outward curve of the birth canal. Between contractions, the vacuum pressure can be reduced or maintained depending on protocol, but rest periods are vital. If the cup slips off repeatedly, or if there is no progressive descent after three pulls, the procedure must be abandoned in favor of an alternative delivery method.
Post-procedure care centers on monitoring both maternal and neonatal wellbeing. Midwives maintain close observation of maternal vital signs, assessing for excessive postpartum hemorrhage or perineal hematomas resulting from episiotomies.
The newborn's scalp will exhibit a raised, edematous swelling known as a chignon, which is a normal, expected consequence of the vacuum cup and usually resolves spontaneously within 24 to 48 hours. Midwives educate parents about this harmless swelling while remaining vigilant for any signs of deep subgaleal hemorrhage or cephalhematoma. Pain relief and psychological debriefing complete the immediate care plan, ensuring the mother understands the intervention performed.