A primigravida client at 38 weeks gestation is admitted to the labor and delivery unit. During the initial assessment, the nurse notes that the client is experiencing irregular contractions every 5-10 minutes lasting 30-45 seconds, with mild intensity. The cervix is 3 cm dilated and 70% effaced. Which assessment finding would be most concerning and require immediate nursing intervention?
1Fetal heart rate baseline of 140 bpm with moderate variability and no decelerations
2Maternal blood pressure of 128/82 mmHg with mild ankle edema
3Clear amniotic fluid with mild bloody show and a small clot
4Sudden cessation of contractions with complaint of severe abdominal pain✓ 정답
해설
Sudden cessation of contractions with severe abdominal pain suggests uterine rupture, a life-threatening emergency requiring immediate intervention. Other findings are normal or expected in active labor.
This question presents a primigravida client at term in early labor. The assessment findings describe a typical latent phase of labor: irregular contractions, mild intensity, and cervical dilation of 3 cm with 70% effacement. The core of the question is to identify which new assessment finding represents a deviation from normal physiology that signals a life-threatening emergency requiring immediate intervention.
Analysis of the Correct Answer: Option 4
The most concerning finding is the sudden cessation of contractions with complaint of severe abdominal pain. This clinical picture is a classic red flag for uterine rupture, a catastrophic obstetric emergency. The pathophysiology involves a complete or partial tearing of the uterine wall. The sudden loss of uterine muscle integrity explains the abrupt halt of contractions; the muscle can no longer generate coordinated contractile force. The severe, constant abdominal pain is caused by intra-abdominal hemorrhage and irritation of the peritoneum from the escaping blood and amniotic fluid.
This concept of a functional cessation of muscular activity following a severe insult can be understood through a parallel in veterinary pathophysiology. In a study of paralytic ileus in cattle, the authors describe a state where "intestinal motor activity is impaired" leading to "cessation of ingesta passage" and subsequent dilatation, occurring "in the absence of a physical obstruction" . While the anatomical site and species differ, the core physiological principle is analogous: a severe, acute injury or insult can cause an abrupt functional shutdown of smooth muscle activity. In uterine rupture, the myometrium's coordinated contractile function ceases not because of a simple fatigue, but due to a structural and functional breakdown of the muscle tissue itself. The nurse must recognize this sudden cessation of labor in the context of acute, severe pain as a sign of this mechanical catastrophe, not as normal labor progression. Immediate priorities are to call for emergency assistance, prepare for immediate cesarean delivery and laparotomy, initiate massive transfusion protocols, and provide maternal hemodynamic support.
Analysis of Incorrect Options
Option 1: Fetal heart rate baseline of 140 bpm with moderate variability and no decelerations.
This is a reassuring fetal heart rate tracing. A baseline of 140 bpm is within the normal range (110-160 bpm), moderate variability indicates a well-oxygenated fetal central nervous system, and the absence of decelerations suggests the fetus is tolerating the contractions well. No intervention is required beyond continued monitoring.
Option 2: Maternal blood pressure of 128/82 mmHg with mild ankle edema.
This blood pressure reading is within normal limits for a term pregnancy. Mild, dependent ankle edema is a common finding in late pregnancy due to mechanical pressure from the gravid uterus on the vena cava, reducing venous return, combined with normal physiological fluid retention. These are expected findings and not a cause for immediate concern.
Option 3: Clear amniotic fluid with mild bloody show and a small clot.
Clear amniotic fluid is a normal finding, indicating the absence of meconium. A bloody show—a small amount of blood-tinged mucus—is a normal physiological sign of cervical change, as the mucus plug is expelled when the cervix begins to dilate and efface. The passage of a small clot can occur with this process. This finding is expected during the latent phase of labor and does not indicate a complication.
Clinical Practice Guide: Uterine Rupture
Key Assessment Findings
Uterine rupture is a sentinel event requiring immediate recognition. The classic triad includes sudden cessation of previously documented contractions, severe, constant abdominal pain, and a loss of fetal station. Other critical signs are vaginal hemorrhage, maternal tachycardia, and hypotension. A non-reassuring fetal heart rate tracing, such as prolonged decelerations or bradycardia, is often the earliest and most reliable sign of fetal compromise.
Immediate Nursing Interventions
Upon suspicion, the nurse must activate the facility's emergency response system and summon the obstetric and anesthesia teams immediately. Simultaneously, administer high-flow oxygen via a non-rebreather mask, establish large-bore intravenous access, and initiate rapid fluid resuscitation with crystalloids. Prepare for an emergency cesarean section and anticipate the need for possible hysterectomy. Continuous maternal and fetal monitoring is essential during all preparations.
Risk Factors and Prevention
The most significant risk factor is a prior classical cesarean section or extensive uterine surgery. Other risks include grand multiparity, injudicious use of oxytocin, obstructed labor, and trauma. Prevention focuses on careful selection of candidates for vaginal birth after cesarean (VBAC), strict adherence to oxytocin protocols, and continuous intrapartum monitoring to detect early signs of impending rupture, such as persistent Category II or III fetal heart rate tracings.
Uterine Rupture — A complete or partial tearing of the uterine wall, a catastrophic obstetric emergency often presenting with sudden cessation of contractions, severe abdominal pain, and signs of hypovolemic shock.
Latent Phase of Labor — The early stage of the first stage of labor, characterized by irregular, mild contractions and cervical dilation from 0 to 3 cm, often with slow progress.
Cervical Effacement — The thinning and shortening of the cervix, expressed as a percentage from 0% (thick) to 100% (paper-thin), which occurs before or during cervical dilation.
Bloody Show — A small amount of blood-tinged mucus discharged from the vagina as the cervix begins to dilate and efface, indicating the loss of the mucus plug.
Fetal Heart Rate Variability — Irregular fluctuations in the baseline fetal heart rate, considered a primary indicator of fetal well-being and an intact autonomic nervous system.