# A nurse is monitoring a laboring client and observes the following fetal heart rate (FHR) pattern: baseline FHR of 140 bpm with recurrent variable decelerations dropping to 70 bpm lasting 60-90 seconds, slow return to baseline, and minimal variability. What is the most appropriate immediate nursing action?

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> language: ko  
> subject: Maternal Newborn Health

## 문제

A nurse is monitoring a laboring client and observes the following fetal heart rate (FHR) pattern: baseline FHR of 140 bpm with recurrent variable decelerations dropping to 70 bpm lasting 60-90 seconds, slow return to baseline, and minimal variability. What is the most appropriate immediate nursing action?

## 보기

1. Change the client's position to left lateral and administer oxygen via face mask at 8-10 L/min **✔ 정답**
2. Continue monitoring and document the findings as this is a normal labor pattern
3. Prepare for immediate cesarean delivery and notify the anesthesiologist
4. Increase the IV fluid rate and encourage the client to push with contractions

**정답: 1**

## 해설

Variable decelerations with slow return and minimal variability suggest cord compression and hypoxia; immediate position change and oxygen administration are priority interventions, while other options (continuing monitoring, immediate cesarean without assessment, or increasing IV/pushing) delay necessary care.

## 심화 해설

Understanding the Fetal Heart Rate Pattern

The fetal heart rate (FHR) tracing described presents a high-risk picture that requires immediate intervention. Let's break down the components using standard nomenclature. The baseline FHR of 140 bpm is within the normal range. However, the presence of recurrent variable decelerations dropping to 70 bpm and lasting 60-90 seconds is significant. Variable decelerations are abrupt decreases in FHR caused by umbilical cord compression. The critical detail here is the "slow return to baseline," which indicates a worsening fetal state where the fetus is struggling to recover from the hypoxic insult of cord compression. This is compounded by minimal variability, which is a key marker of fetal metabolic acidemia and central nervous system depression. Together, these characteristics classify this tracing as a Category III pattern, which is predictive of abnormal fetal acid-base status and requires prompt evaluation and intervention [1,2].

Rationale for the Immediate Nursing Actions

The most appropriate initial nursing actions are intrauterine resuscitation measures aimed at improving fetal oxygenation and perfusion. The primary physiological goals are to relieve cord compression and maximize uteroplacental blood flow.

- Change the client's position to left lateral: This is a foundational intervention. A left lateral position displaces the gravid uterus off the maternal great vessels (aorta and vena cava), which significantly improves venous return to the heart and subsequent uteroplacental perfusion. This directly addresses the potential for cord compression and enhances oxygen delivery to the fetus [1,3].

- Administer oxygen via face mask at 8-10 L/min: The rationale is to increase the maternal partial pressure of oxygen, thereby maximizing the diffusion gradient for oxygen transfer across the placenta to a potentially hypoxic fetus. While the universal benefit of maternal oxygen supplementation for all abnormal FHR patterns has been debated, it remains a standard, non-invasive intrauterine resuscitation technique specifically indicated when there is evidence of ongoing fetal compromise, such as the minimal variability and slow return to baseline seen here [2,3].

Why the Other Options Are Incorrect

- Option 2 (Continue monitoring): This is a dangerous choice. The described pattern is not a normal labor pattern. Recurrent deep variable decelerations with a slow recovery and minimal variability are ominous signs of fetal hypoxia and evolving acidemia. Continued observation without intervention risks progressive fetal injury [1,2].

- Option 3 (Prepare for immediate cesarean delivery): While this tracing may ultimately require expedited delivery, it is not the most immediate nursing action. The nurse's first step is to initiate bedside resuscitative measures. If the FHR pattern does not resolve with these interventions, the nurse would then notify the provider and prepare for a potential operative delivery. This option skips a critical, potentially corrective step .

- Option 4 (Increase IV fluid rate and encourage pushing): Increasing IV fluids can be a supportive measure for maternal hypotension, but it is not the primary intervention for cord compression. More critically, encouraging the client to push with contractions during a Category III tracing is contraindicated. Pushing increases intrathoracic and intra-abdominal pressure, which can further reduce uterine blood flow and exacerbate cord compression, worsening the fetal hypoxia [1,3].

## 임상 시나리오

Clinical Management of Category III Fetal Heart Rate Tracings

Recognizing the High-Risk Tracing

A Category III tracing, such as the one described, includes recurrent variable decelerations with a slow return to baseline and minimal variability. This pattern indicates significant fetal hypoxic stress and potential metabolic acidemia. The slow return signifies that the fetus is struggling to recover from the hypoxic insult of cord compression, while minimal variability reflects central nervous system depression. This is an obstetric emergency requiring immediate bedside intervention.

Step-by-Step Intrauterine Resuscitation Protocol

The immediate nursing priority is to initiate intrauterine resuscitation to improve fetal oxygenation and perfusion. The following actions should be performed rapidly and concurrently:

- **Reposition the Client:** Place the client in a left lateral position to relieve aortocaval compression and maximize uteroplacental blood flow. If left lateral is not effective, try right lateral, knee-chest, or hands-and-knees positions.

- **Administer Oxygen:** Apply a non-rebreather face mask at 8-10 L/min to increase maternal oxygen saturation and oxygen delivery to the fetus.

- **Increase IV Fluids:** Administer a bolus of isotonic IV fluids (e.g., Lactated Ringer's) as ordered to improve maternal intravascular volume and placental perfusion.

- **Discontinue Uterotonics:** If oxytocin is infusing, stop it immediately to reduce uterine contraction frequency and intensity, which can exacerbate cord compression.

- **Notify the Provider:** Simultaneously, communicate the findings and interventions to the obstetrician or midwife, preparing for potential expedited delivery if the tracing does not improve.

Ongoing Assessment and Decision-Making

After implementing resuscitation measures, continuously evaluate the fetal heart rate tracing for improvement. If the tracing resolves to a Category I or II pattern, labor may continue with heightened surveillance. If the Category III pattern persists despite these interventions, the team should prepare for immediate cesarean delivery, as this indicates unresolved fetal compromise.

## 핵심 개념

- **Variable Decelerations** — Abrupt decreases in fetal heart rate caused by umbilical cord compression, characterized by a V-shaped appearance on the monitor tracing.
- **Minimal Variability** — Fluctuations in the baseline fetal heart rate of less than 5 bpm, indicating fetal metabolic acidemia and central nervous system depression.
- **Category III FHR Tracing** — An abnormal fetal heart rate pattern predictive of abnormal fetal acid-base status, requiring prompt evaluation and intrauterine resuscitation.
- **Intrauterine Resuscitation** — A set of interventions including maternal repositioning, oxygen administration, and IV fluid bolus aimed at improving fetal oxygenation and perfusion.
- **Left Lateral Position** — A maternal position that displaces the gravid uterus off the aorta and vena cava, maximizing uteroplacental blood flow and fetal oxygenation.

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