What is amnioinfusion?

After the membranes have ruptured, a clinician can pass a thin catheter through the cervix and introduce sterile saline into the uterus. The added fluid may create more space around the umbilical cord when the fetal heart-rate pattern suggests cord compression. In selected circumstances, the team may consider it when thick meconium is present, according to the clinical situation and local practice.

Amnioinfusion is different from amniocentesis. Amniocentesis removes a small fluid sample through the abdomen for diagnostic testing; amnioinfusion puts fluid into the uterus as an intervention during labour. Continuous or frequent observation may include the fetal heart rate, contraction pattern, fluid returning from the vagina and the mother's vital signs.

Ask which labour finding the team is trying to improve and how they will judge whether the infusion is helping. Tell them about fever, uterine pain, bleeding, previous uterine surgery, known infections and medication allergies. The procedure requires hospital monitoring, so follow staff guidance about position changes and alert them if discomfort, pressure or breathlessness develops.

You can request an explanation of alternatives and what would happen if the fetal heart-rate concern continues. Consent should cover how the catheter is inserted, what monitoring you and the baby will receive, and the circumstances in which the infusion would be slowed or stopped.

During an amnioinfusion, tell the labour team straight away about sudden or severe abdominal pain, difficulty breathing, chest discomfort, dizziness, heavy vaginal bleeding, chills or a rapid increase in pressure. Staff also watch for fever, unusual uterine tenderness, changes in contractions and concerning fetal heart-rate patterns. After birth, urgent review is needed for heavy bleeding, fainting, fever or worsening pelvic pain.

Ask what the fetal monitor is showing, what benefit is expected in your particular situation, and how long the team plans to continue fluid. Clarify what signs would lead them to stop the procedure or recommend another form of delivery, and whether the catheter changes your options for movement or pain relief.