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What is it
A thin catheter with a small balloon at the tip is placed just inside the cervix. The balloon is filled with sterile water and provides gentle pressure that often helps the cervix soften and open.
How your body works here
Cervical ripening depends on collagen breakdown and prostaglandin release in the cervix. Steady mechanical pressure from the balloon stretches the internal os, which sends a signal to release local prostaglandins and mimics the pressure a baby's head normally provides. That combined stretch + hormone loop is what softens and opens the cervix.
Benefits (B)
- Does not involve medication.Review sources ↓
- Often well tolerated; can be used in many situations where medications are not preferred.Review sources ↓
- May be combined with other induction methods.Review sources ↓
Risks (R)
- Discomfort during placement.Review sources ↓
- Mild bleeding or cramping.Review sources ↓
- Accidental rupture of membranes; rarely, infection.Review sources ↓
Alternatives (A)
- Cook (double) catheter.Review sources ↓
- Medication-based cervical ripening (Cytotec, Cervidil).Review sources ↓
- Wait for spontaneous labor when medically safe.Review sources ↓
Evidence summary
Mechanical ripening with a Foley is comparable in effectiveness to prostaglandin medications in many studies, with a different side-effect profile (less uterine hyperstimulation, more procedural discomfort).
Sources
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Questions to ask your provider
- Why is this being recommended over a medication?
- How long does the balloon stay in?
- What happens if it doesn't ripen the cervix?
Intuition & Nothing/Wait (the I and N in BRAIN)
What is your gut telling you? What happens if you do nothing or wait?
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