PROM vs SROM on the NCLEX
Rupture of membranes: PROM, PPROM, and SROM, nitrazine and fern testing, infection surveillance, and cord prolapse risk.
Every rupture-of-membranes question hides the same two priorities: check the fetal heart rate and watch for infection.
The terms
SROM: spontaneous rupture, typically during labor at term. PROM: rupture before labor begins, at term. PPROM: rupture before labor and before 37 weeks. AROM: artificial rupture by the provider (amniotomy).
Confirming rupture
Nitrazine paper turns blue with amniotic fluid (alkaline). False positives from blood and semen. Fern test: dried fluid shows a fern pattern under the microscope. Also: pooling of fluid in the vagina on speculum exam. Note the fluid's color, odor, amount, and the time of rupture. Green fluid = meconium; report it.
First action after rupture
Assess the fetal heart rate. Rupture is the moment the cord can wash down past the presenting part, especially with a high presenting part, malpresentation, or polyhydramnios. A sudden prolonged deceleration or bradycardia right after rupture = suspect cord prolapse and act on it.
Infection surveillance
Once membranes are open the clock runs on chorioamnionitis: maternal fever and tachycardia, fetal tachycardia (often the earliest sign), uterine tenderness, foul fluid. Minimize vaginal exams and keep them sterile. Monitor maternal temperature frequently per protocol. With PPROM, expect latency antibiotics, betamethasone, and monitoring rather than immediate delivery when mother and fetus are stable.
Frequently asked
Membranes ruptured at home 20 hours ago. Why does the team care about the time?
Prolonged rupture (commonly defined as 18 hours or more) raises infection risk for mother and newborn, and it changes antibiotic decisions, including GBS coverage.
Nitrazine is blue but she reports urine leakage. Now what?
Nitrazine alone can mislead. Combine it with ferning and pooling on sterile speculum exam. Urine is acidic and does not fern.
Why avoid routine vaginal exams after PROM?
Each exam carries organisms toward the uterus. With no labor to assess, the exam adds infection risk without adding information.
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