Internal fetal heart monitor

After the membranes have broken and the cervix has opened enough, a clinician may attach a small electrode to the baby’s presenting part, usually the scalp. A wire connects the electrode to a monitor that displays the fetal heart rate continuously. This can provide a steadier signal than a belt on the abdomen when movement, body position, or equipment makes the external trace difficult to interpret. The monitor records heart-rate patterns; it does not measure the baby’s pain or predict every outcome. Internal monitoring is not suitable in every situation, including some infections or bleeding disorders, so the maternity team considers your circumstances first.

The clinician explains why closer monitoring is being considered, checks your consent, and performs a vaginal examination before placing the electrode. You may feel pressure during the examination, and the wire remains attached while monitoring continues. Tell the team if you have concerns about infection, your membranes, or any condition that could affect the procedure. You can ask whether external monitoring can provide a clear trace, how long internal monitoring is expected to continue, and what the reading may change in your care. See [Fetal Heart Monitoring](/treatments/pregnancy-and-birth-care/fetal-heart-monitoring/) for the wider monitoring approach.

During labour, tell your midwife or doctor immediately if you feel new severe pain, heavy bleeding, fever, chills, faintness, or a sudden change in your condition. After the electrode is removed, report fever, worsening tenderness, pus or unusual discharge, or a skin wound that becomes increasingly red or swollen. The maternity team should also know if the wire becomes loose or causes discomfort, because it may need checking or removal.

Why is an internal sensor being recommended for me? Is there a clear alternative using an abdominal monitor? What are the infection precautions? How could the trace affect decisions during labour?