OB

Labor Stages and Fetal Monitoring

General Overview of Labor Stages

  • The process of labor is classified into different stages and phases.
  • Early detection of fetal status is essential.

First Stage of Labor

  • Starts from the onset of labor until the cervix is 10 centimeters dilated and 100% effaced.
  • Includes three phases:
    • Latent Phase: Onset of true labor at 4 cm dilation with contractions 5-10 minutes apart, lasting 30-45 seconds with mild intensity.
    • Active Phase: Increased frequency and intensity of contractions.
    • Transition Phase: Final effacement and dilation just before pushing begins.

Fetal Heart Rate (FHR) Monitoring

  • Initial monitoring is essential to establish a baseline FHR.
    • Baseline Frequency: Should be measured between contractions for at least 20-30 minutes upon admission.
    • Normal FHR Range: 110-160 beats per minute.
  • Variability is critical for assessing fetal well-being.
    • Variability Metrics:
    • Absent: No fluctuations in heart rate.
    • Moderate: Fluctuations between 15 bpm above or below the baseline.

Methods of Fetal Monitoring

  • External Monitoring:
    • Electronic Fetal Monitor (EFM): Continuous monitoring method.
    • Equipment includes a handheld Doppler or pedoscope.
  • Internal Monitoring: Used when external methods fail due to factors such as fetal position, maternal tissue, or amniotic fluid volume.
    • Involves placing a small electrode onto the fetal scalp, which is invasive and not commonly used due to infection risks.

Heart Rate Changes and Their Causes

  • Early Decelerations: Caused by head compression.
    • Correlates with contractions; fetal heart rate decreases during the contraction.
  • Variable Decelerations: Caused by umbilical cord compression.
    • Can vary in onset and shape; may require repositioning of the mother.
  • Late Decelerations: Signal potential placental insufficiency; indicates the fetus is not receiving adequate perfusion.

Nursing Responsibilities During Labor

  • Monitor vital signs and fetal heart rate continuously.
  • Evaluate both maternal and fetal conditions regularly.
    • Look for signs of fetal distress:
    • Persistent fetal bradycardia (heart rate < 110 bpm) for prolonged periods.
  • Supportive measures provided to the mother and her partner:
    • Emotional support and physical assistance during contractions.

Specific Nursing Actions in Different Labor Phases

  • Latent Phase: Regular assessments and ensuring comfort.
    • Vital signs monitored hourly; hydration status important.
    • Encourage movement and changing positions to enhance labor progression.
  • During Active Phase: Assessing the fetal heart rate constantly.
    • Instructions on breathing and relaxation techniques to manage pain without opposing contractions.

Hydration and Nutritional Guidelines

  • Monitoring hydration is crucial; as IV fluids are often provided for better control.
  • Some facilities may allow minimal food intake (small snacks or ice chips) depending on the mother's condition and progress in labor.

Emotional and Physical Support

  • Helping the mother cope with pain and anxiety through education and positive reinforcement.
  • Encouraging the involvement of the birth partner in the process to help with emotional support.