A nurse is monitoring a laboring client at 40 weeks gestation. The fetal heart rate tracing shows a baseline of 140 bpm with moderate variability. During the last three contractions, the nurse observes late decelerations that begin after the peak of the contraction and return to baseline after the contraction ends. The client's blood pressure is 90/60 mmHg, and she reports feeling dizzy when lying flat. What is the nurse's priority action?

Late decelerations with supine hypotension suggest vena cava compression. Positioning in left lateral relieves this and improves placental blood flow, making it the priority over other interventions.

Core Nursing Explanation Key Concept Analysis: This question tests the priority nursing intervention for a specific fetal heart rate (FHR) pattern: Late decelerations. Late decelerations are characterized by a gradual decrease in FHR that begins after the peak of the contraction and returns to baseline after the contraction ends. This pattern is a sign of uteroplacental insufficiency, meaning the placenta is not delivering enough oxygen to the fetus during contractions. The patient's symptoms (dizziness, low BP of 90/60 mmHg) point to supine hypotensive syndrome, where the gravid uterus compresses the maternal inferior vena cava (IVC), reducing venous return, cardiac output, and ultimately, uterine blood flow.

Answer Rationale: Key Point! The priority action is to correct the reversible cause of the late decelerations. In this scenario, the cause is strongly indicated to be reduced placental perfusion due to maternal hypotension from vena cava compression. Repositioning the client to the left lateral position lifts the uterus off the IVC and aorta, immediately improving venous return, cardiac output, and uterine blood flow. This simple, non-invasive intervention is the first and most critical step to potentially resolve the late decelerations and improve fetal oxygenation.

Distractor Analysis:
Watch out for confusion! While administering oxygen (Option 1) is an appropriate supportive measure to increase maternal oxygen saturation and fetal oxygen supply, it does not address the root cause of the problem—the mechanical compression of blood vessels. It is a secondary intervention.
Increasing IV fluids (Option 3) may help correct maternal hypotension, but repositioning is faster and directly relieves the compression. Fluids are important but not the immediate first step.
Preparing for cesarean delivery (Option 4) is a definitive intervention for persistent, uncorrected late decelerations indicating fetal compromise. However, the nurse must first implement corrective measures (like repositioning) to see if the FHR pattern improves. Jumping to immediate preparation for surgery is not the initial nursing priority.

Related Concepts: The management of FHR decelerations follows a logical sequence: first, position change (left lateral), then oxygen administration, then IV fluid bolus if indicated, and finally, notifying the provider and preparing for further interventions if the pattern does not improve. This scenario perfectly illustrates the application of the "ABCD" mnemonic for fetal resuscitation: Alter position, Boost fluids/O₂, Correct hypotension, Discontinue oxytocin (if infusing). Concept Summary

Concept	Description	Nursing Implication
Late Deceleration	Gradual FHR decrease that mirrors the contraction, starting after the peak. Caused by uteroplacental insufficiency.	First action: Reposition to left lateral to improve placental perfusion.
Supine Hypotensive Syndrome	Compression of IVC by gravid uterus when supine, causing maternal hypotension, dizziness, and fetal distress.	Prevent/treat by positioning in left lateral or semi-Fowler's position.
Moderate Variability	FHR fluctuations of 6-25 bpm. A reassuring sign of intact fetal central nervous system and adequate oxygenation.	Its presence here is positive; the fetus is not yet acidotic, giving time for corrective measures.

Side-by-Side Comparison!

Deceleration Type	Shape & Timing	Pathophysiology	Primary Nursing Action
Early Deceleration	Mirrors contraction. Nadir at peak of contraction. Head compression.	Benign. Vagal response from fetal head compression.	No intervention needed. Reassuring pattern.
Variable Deceleration	Abrupt, variable shape/depth/timing. Cord compression.	Umbilical cord compression affecting fetal circulation.	Change maternal position (left/right, Trendelenburg) to relieve cord pressure.
Late Deceleration	Gradual, starts after contraction peak. Uteroplacental insufficiency.	Inadequate oxygen transfer across placenta.	Left lateral position, O2, IV fluids, notify provider.

Anatomy, Physiology & Pharmacology Points Anatomy/Physiology: The inferior vena cava (IVC) is located to the right of the spine. In a supine position at term, the uterus can compress it, reducing preload. The left lateral position shifts the uterus leftward, off the IVC and the aorta, restoring blood flow.
Pharmacology: If oxytocin (Pitocin) were infusing, the nurse would also stop it, as oxytocin can cause excessive uterine activity (tachysystole), worsening placental perfusion. Memory Tips

• LATE for PLACENTA: Late decelerations are due to Placental problems.
• VEAL CHOP Mnemonic: Variable -> Cord Compression. Early -> Head Compression. Accelerations -> OK. Late -> Placental Insufficiency.
• ABCD for Fetal Resuscitation: Alter position, Boost (fluids/O2), Correct hypotension, Discontinue oxytocin.

High-Frequency NCLEX Topics Fetal heart rate interpretation is a Core and High Yield topic. The NCLEX loves to test your ability to prioritize interventions based on FHR patterns. You must know the defining characteristics and primary causes of early, variable, and late decelerations, and the corresponding first-line nursing actions. Watch Out for Question Variations! * Instead of asking for the priority action, the question might ask: "The nurse understands that this FHR pattern is most likely caused by which of the following?" (Answer: Uteroplacental insufficiency). * The scenario could include a patient receiving oxytocin, making "discontinuing the oxytocin infusion" a key intervention alongside repositioning. * The question could test if you know that moderate variability is a reassuring sign, indicating the fetus is not in immediate metabolic acidosis, thus supporting the choice of a non-emergent intervention first.

Nursing Clinical Practice Guide Clinical Scenario: You are the labor nurse for Maria, a 40-week G1P0 patient. As you review the electronic fetal monitor (EFM), you see the classic "U-shaped" dips of late decelerations following the last three contractions. You check Maria's vitals: BP is low, and she mentions feeling lightheaded. She is lying flat on her back for a cervical check.

Nursing Intervention Strategy: 1. Immediate Action (Assessment & Intervention): Calmly say, "Maria, I'm going to help you roll onto your left side. This will help you and the baby feel better." Assist her into a left lateral position, possibly with a pillow behind her back for support. This is your first and fastest intervention. 2. Simultaneous Actions: While repositioning, instruct a colleague or call out to "Administer oxygen at 10 L/min via non-rebreather mask" and "Check the IV line and increase the rate of the primary IV fluid (likely Lactated Ringer's) per protocol." You are now implementing the "B" (Boost) step. 3. Reassessment: After 2-3 contractions in the new position, reassess the FHR tracing. Are the late decelerations improving or resolving? Recheck maternal blood pressure and symptoms. 4. Communication & Documentation: Notify the obstetric provider immediately with a clear SBAR report: Situation (late decels with maternal hypotension), Background (40-week patient in active labor), Assessment (suspect supine hypotensive syndrome, moderate variability present), Recommendation (position changed, O2 and fluids initiated, awaiting your assessment). Document everything meticulously: time of decelerations, maternal symptoms, all interventions taken, and the fetal and maternal response.

Patient Safety and Precautions: * Key Point! Never leave a patient with recurrent late decelerations unattended. Continuous monitoring is essential. * If the FHR does not improve with positioning, O2, and fluids, or if variability becomes minimal/absent, this indicates worsening fetal compromise. The team will then move toward expedited delivery (possibly cesarean). * Ensure the oxygen delivery device is properly fitted to achieve high FiO₂ (Fraction of inspired oxygen). Nursing Procedure & Medication Flow Procedure: Responding to Late Decelerations 1. Assess the entire clinical picture: FHR pattern, contraction pattern, maternal vital signs and position. 2. First Step: Reposition. Left lateral is gold standard. If not tolerated, try right lateral or semi-Fowler's. 3. Second Step: Increase Oxygenation. Apply face mask at 8-10 L/min. 4. Third Step: Improve Circulation. Increase IV fluid rate (e.g., open up a mainline of LR). If an epidural is in place, a fluid bolus may be indicated. 5. Fourth Step: Notify Provider & Prepare. Communicate findings. If oxytocin is running, stop it. Prepare for possible operative delivery if no improvement.
Medication Note: If magnesium sulfate is infusing for preterm labor or preeclampsia, be aware it can cause maternal hypotension, which could exacerbate late decels. Report this to the provider. A Word from Your Senior Nurse "Remember, in labor and delivery, you are caring for two patients. That fetal monitor is your window into the baby's well-being. Late decelerations are the fetus saying, 'I'm not getting enough oxygen with these contractions.' Your job is to be a detective and a first responder. Find the cause (often position!) and fix it fast. The left lateral roll is one of the most powerful tools in your nursing arsenal. Mastering these interventions—knowing *why* you do them and in what order—is what turns a nervous student into a confident, life-saving labor nurse. You've got this!"