A pregnant client at 36 weeks gestation presents to the labor and delivery unit with a sudden gush of clear fluid from the vagina 2 hours ago. The client reports no contractions but feels decreased fetal movement. Vital signs are stable, and the fetal heart rate shows minimal variability with occasional variable decelerations. What is the nurse's priority action?
1Perform a sterile speculum examination to confirm rupture of membranes
2Position the client in left lateral position and administer oxygen✓ 정답
3Prepare the client for immediate cesarean delivery
4Obtain a clean-catch urine specimen for analysis
해설
With PROM and FHR changes (minimal variability, variable decelerations), priority is optimizing fetal oxygenation by left lateral positioning and oxygen. Sterile speculum exam (1) delays intervention, cesarean (3) is premature without further assessment, and urine analysis (4) is not urgent.
The client presents at 36 weeks gestation with a history of spontaneous rupture of membranes (SROM) and now reports decreased fetal movement. The fetal heart rate (FHR) tracing reveals minimal variability with variable decelerations. This combination of findings is highly concerning for fetal hypoxemia and acidemia, likely secondary to umbilical cord compression in the setting of oligohydramnios following membrane rupture.
Pathophysiology and Rationale for Priority Action
The sudden gush of fluid reduces the amniotic fluid volume, which normally cushions the umbilical cord. With less fluid, the cord is vulnerable to compression, especially during fetal movements or uterine contractions. Variable decelerations are the classic FHR pattern associated with umbilical cord compression. When cord compression becomes frequent or sustained, it impairs fetal oxygenation, leading to the loss of beat-to-beat variability—a key indicator of fetal central nervous system oxygenation. Minimal variability signals fetal hypoxemia and acidemia, which can progress to metabolic acidosis if not promptly corrected. The client’s report of decreased fetal movement further supports the concern for fetal compromise.
The priority nursing action is to improve fetal oxygenation and relieve cord compression. Positioning the client in the left lateral position displaces the gravid uterus off the inferior vena cava, enhancing maternal cardiac output and uteroplacental perfusion. Administering oxygen via a non-rebreather mask increases the maternal partial pressure of oxygen (PaO2), which augments the oxygen gradient for transfer to the fetus. These intrauterine resuscitation measures are immediate, non-invasive, and directly target the underlying pathophysiology of fetal hypoxemia.
Analysis of Other Options
- Option 1 (Sterile speculum examination): While confirming rupture of membranes is an important assessment, it is not the priority. The client’s history of a sudden gush of fluid is a classic clinical sign of SROM. Performing a speculum exam introduces a delay in addressing the non-reassuring FHR pattern and may increase the risk of infection. Fetal well-being takes precedence over diagnostic confirmation in this scenario.
- Option 3 (Immediate cesarean delivery): Preparation for cesarean delivery may become necessary if intrauterine resuscitation measures fail to resolve the non-reassuring FHR pattern. However, it is not the initial priority. The nurse must first implement bedside interventions to improve fetal oxygenation. If the FHR pattern normalizes with repositioning and oxygen, an emergency cesarean may be avoided.
- Option 4 (Clean-catch urine specimen): A urinalysis is a routine part of the admission assessment but does not address the acute, life-threatening situation of fetal hypoxemia. This action is not a priority when the FHR tracing shows signs of fetal distress.
Evidence-Based Context
The principles of intrauterine resuscitation, including maternal repositioning and oxygen administration, are foundational in obstetric nursing to correct fetal hypoxemia. The underlying mechanism—improving uteroplacental perfusion and maternal oxygenation—is consistent with the broader physiological goals of resuscitation across populations. While the provided guideline references [1,2,3] focus on cardiogenic shock and veterinary newborn resuscitation, they underscore a universal principle: the initial management of a hypoxemic state requires immediate, low-risk interventions to optimize oxygen delivery before escalating to more invasive procedures. In this clinical context, the nurse’s priority is to apply these principles to reverse the suspected fetal hypoxemia caused by cord compression, thereby preventing progression to severe acidemia and potential fetal demise.
Clinical Scenario
A 36-week pregnant client presents with spontaneous rupture of membranes and decreased fetal movement. The fetal monitor shows minimal variability and variable decelerations, indicating fetal hypoxemia likely from umbilical cord compression due to oligohydramnios.
Priority Nursing Action
Initiate intrauterine resuscitation immediately. Position the client in the left lateral position to displace the uterus off the inferior vena cava, enhancing maternal cardiac output and uteroplacental perfusion. Administer oxygen at 10 L/min via non-rebreather mask to increase maternal-fetal oxygen gradient. These actions aim to correct fetal hypoxemia and resolve the non-reassuring heart rate pattern before considering operative delivery.
Clinical Reasoning
Variable decelerations are a hallmark of cord compression. The loss of variability signals central nervous system depression from acidemia. Addressing the underlying physiology—cord compression and reduced oxygenation—is the immediate priority. Sterile speculum exam to confirm rupture is secondary. Cesarean delivery is reserved for failure of resuscitative measures. Urine collection is irrelevant to the acute presentation.
Key Practice Points
Left lateral positioning is the first-line intervention for non-reassuring FHR patterns to maximize placental perfusion.
Administer oxygen and notify the provider simultaneously; continuous FHR monitoring is essential to evaluate response.
Decreased fetal movement is a critical maternal report that warrants immediate evaluation alongside FHR interpretation.
Variable Decelerations — Abrupt decreases in fetal heart rate below baseline, typically V-shaped, caused by umbilical cord compression, often seen with oligohydramnios.
Minimal Variability — Amplitude range of ≤5 bpm in the fetal heart rate baseline, indicating fetal hypoxemia or acidemia affecting the central nervous system.
Intrauterine Resuscitation — Nursing interventions such as maternal repositioning, oxygen administration, and IV fluid bolus to improve fetal oxygenation and correct FHR patterns.
Oligohydramnios — Reduced amniotic fluid volume, often following membrane rupture, which increases the risk of umbilical cord compression.
Uteroplacental Perfusion — Blood flow to the uterus and placenta, essential for fetal oxygenation; enhanced by left lateral positioning which relieves vena cava compression.