Comprehensive Notes: Fetal Heart Rate Monitoring and Labor Nursing Care

Fetal Heart Rate Monitoring and Labor Nursing Care

• Purpose of fetal heart rate (FHR) monitoring during labor

  • Patterns in FHR help assess fetal well-being and oxygenation

  • Terms to know: accelerations, artifact, baseline FHR, baseline variability, decelerations, periodic baseline changes, electronic fetal monitoring (EFM)

• Baseline fetal heart rate (FHR)

  • Baseline FHR is the average heart rate during a 10-minute window excluding accelerations and decelerations

  • Normal baseline range: $110 \leq \text{FHR}_{\text{baseline}} \leq 160\ \text{beats per minute (bpm)}$

  • Tachycardia: \text{FHR}_{\text{baseline}} > 160\ \text{bpm} \ \text{for} \ \ge 10\ \text{minutes}

  • Bradycardia: \text{FHR}_{\text{baseline}} < 110\ \text{bpm} \ \text{for} \ \ge 10\ \text{minutes}

• Baseline variability (beat-to-beat fluctuations around the baseline)

  • Indicates healthy, responsive fetal nervous system

  • Categories:

  • Absent: flat line, no variability (bad sign, no oxygen reserves)

  • Minimal: variation (\Delta \text{FHR} \le 5\ \text{bpm})

  • Moderate: variation $6 \le \Delta \text{FHR} \le 25\ \text{bpm}$ (most reassuring)

  • Marked: variation \Delta \text{FHR} > 25\ \text{bpm} (neither clearly reassuring nor nonreassuring)

• Accelerations

  • Temporary increases in FHR above baseline

  • Criteria (applies after 32 weeks gestation): $\Delta \text{FHR} \ge 15\ \text{bpm} \ \text{for} \ \ge 15\ \text{seconds}$

  • Very reassuring sign of fetal well-being and good oxygenation

• Decelerations (temporary decreases in FHR below baseline)

  • Types:

  • Early decelerations: gradual decrease that mirrors contractions; usually head compression; benign

  • Variable decelerations: abrupt drop in FHR, often V-shaped; usually cord compression; may require position change, oxygen, or amnioinfusion in some cases

  • Late decelerations: begin after the contraction starts and recover after it ends; due to uteroplacental insufficiency; concerning; require immediate intervention

  • Prolonged decelerations: drop of $\ge 15\ \text{bpm}$ lasting $2-10\ \text{minutes}$; may indicate hypoxia, cord prolapse, or maternal hypotension

• Periodic vs episodic changes

  • Periodic: occur with contractions

  • Episodic: occur without contractions; cause may include movement, poor signal, or other factors

  • Goal: identify cause of fetal heart rate changes and respond appropriately

• Fetal position and descent assessment

  • Leopold’s maneuvers or vaginal exam determine presenting part, lie, attitude, station, engagement

  • Fetal position (e.g., posterior position) can influence FHR patterns and may cause decelerations due to stress during descent

• Three-tier fetal heart rate tracing interpretation

  • Category I (Normal, reassuring):

  • Baseline 110–160 bpm

  • Moderate variability

  • No late or variable decelerations

  • Accelerations present

  • Indicates well-oxygenated fetus; routine monitoring

  • Category II (Indeterminate):

  • Not clearly reassuring or abnormal

  • Requires closer observation/interventions as needed

  • May show late decelerations with continued variability and accelerations

  • Category III (Abnormal, nonreassuring):

  • Absent baseline variability with recurrent late or variable decelerations or bradycardia

  • May include sinusoidal pattern

  • Indicates high risk for fetal compromise; requires immediate intervention

  • Interventions: maternal positioning, 8–10 L/min oxygen, IV fluid bolus, stop oxytocin, assess for reversible causes, prepare for urgent delivery

• Fetal monitoring: types and components

  • Intermittent auscultation: Doppler or fetoscope

  • Continuous electronic fetal monitoring (EFM): most common

  • External: ultrasound transducer + tocotransducer (toco)

  • Internal: fetal scalp electrode (FSE) + intrauterine pressure catheter (IUPC)

• External vs internal monitoring: quick recap

  • External monitoring

  • Noninvasive; uses ultrasound transducer to measure FHR and a tocodometer to measure contractions

  • May lose signal with movement; more comfortable

  • Internal monitoring

  • More accurate; direct measurement of FHR via FSE and precise contraction data via IUPC

  • Requires ruptured membranes and cervical dilation; presents with some movement limitations and potential discomfort

• Internal fetal monitoring prerequisites and indications

  • FSE (fetal scalp electrode) prerequisites:

  • Ruptured membranes

  • Cervix dilated to ≈ 2–3 cm or more; presenting part accessible

  • Vertex presentation preferred

  • No infection (e.g., HIV, herpes lesions, hepatitis C) or other infections

  • IUPC (intrauterine pressure catheter) prerequisites:

  • Ruptured membranes

  • Cervical dilation typically ≥ 2 cm (provider-dependent)

  • Need for accurate contraction measurement (especially with I/O or indeterminate external readings)

  • No contraindications (placenta previa, active vaginal bleeding, uterine infection)

  • Indications for internal monitoring:

  • High-risk pregnancies (preeclampsia, diabetes, IUGR, maternal hypertension)

  • Nonreassuring FHR patterns, prolonged labor, suspected inadequate contractions, or need for precise contraction assessment (e.g., oxytocin augmentation or induction)

• Advantages and limitations of internal monitoring

  • Advantages: continuous data for fetus and contractions; high accuracy; early detection of nonreassuring patterns

  • Limitations: restricts maternal movement; increased interventions; uncomfortable; risk of false alarms due to poor signal or electrode issues

• Nursing responsibilities with EFM

  • Apply equipment correctly and ensure functioning

  • Assess and interpret FHR strips (baseline, variability, accelerations, decelerations)

  • Reposition mother to improve FHR patterns

  • Provide interventions (oxygen, IV fluids, stop oxytocin if indicated)

  • Notify provider promptly and document assessments, interpretations, and interventions

  • Educate patient and support person about monitoring purpose and process

  • Balance continuous monitoring with clinical judgment and individualized care

• Guidelines for assessing fetal heart rate during labor

  • Baseline FHR assessment: initial 10–20 minutes of continuous monitoring to establish baseline

  • Documentation frequency depends on risk status; higher risk demands closer documentation

  • Low-risk during active labor: intermittent auscultation every ~30 minutes; high-risk or continuous monitoring as indicated

  • Second stage monitoring: intermittent auscultation every ~15 minutes for low risk; every ~5 minutes for high risk when continuous monitoring is not used

  • Overall goal: detect fetal hypoxia or distress early and guide timely interventions

• Monitoring options and devices in practice

  • Wireless external monitors: patient can move more freely, but readings depend on signal stability and electrode placement

  • Conventional wired external monitors: belts and transducers; movement can dislodge sensors; may be uncomfortable

  • Internal monitors: provide precise data; placement requires ruptured membranes and dilation; potential for increased patient discomfort

• Pain management during labor: nonpharmacologic and pharmacologic options

  • Nonpharmacologic pain management

  • Continuous labor support (doula, partner, childbirth education, Lamaze)

  • Positioning and movement (upright, sidelying, squatting, kneeling, walking)

  • Birthing balls, peanut balls to assist pelvic opening and descent

  • Massage and touch (back rubs, counterpressure, hand/foot massage, sacral pressure)

  • Heat/cold therapy and warm baths/showers; use with or without movement; birthing tubs where available

  • Acupressure, acupuncture, hypnosis, biofeedback (more common in birth centers)

  • Aromatherapy and music

  • Nursing role: assess preferences, educate on options, monitor effectiveness and safety, encourage active participation

  • Pharmacologic pain management

  • Systemic analgesia (IV opioids): morphine, fentanyl; Demerol less common due to neonatal respiratory depression risk; can be used in early/moderate labor; avoid within ~2 hours of birth

  • Benzodiazepines (for anxiety/sedation) with maternal and fetal monitoring

  • Regional anesthesia

    • Epidural anesthesia: local anesthetic + opioid (e.g., bupivacaine + fentanyl); provides pain relief from below the breasts to the perineum; may cause maternal hypotension; mobility is limited; bladder catheterization often required

    • Spinal anesthesia: rapid, effective relief; often used for cesarean births; duration limited (around 2 hours) and may require re-administration

  • Local anesthesia (pudendal block): less common; blocks pudendal nerve; not for contractions pain

  • Nitrous oxide (laughing gas): self-administered; rapid onset; minimal fetal effect; potential dizziness or nausea; not universal in all facilities

  • General anesthesia: used primarily for emergency cesarean births; neonatal resuscitation and maternal airway management required; partner presence often restricted in emergencies

• First stage of labor: nursing assessment and management

  • Phone assessment tips for potential labor (triage by phone)

  • Gather patient details: name, age, gestational age, parity, birth plan, risk factors (e.g., hypertension, diabetes, prior cesarean)

  • Assess contractions: frequency, duration, intensity, patient ability to talk through them

  • Membrane status: ruptured or not; if ruptured, color, odor, amount

  • Vaginal bleeding: amount and color; bright red bleeding an emergency

  • Fetal movement: presence or absence

  • Pain level and other symptoms (fever, chills, headache, dizziness)

  • Admission assessment elements

  • Obstetric history: gravida/para, prior cesarean/vaginal delivery, prior complications

  • Current pregnancy details: gestational age, prenatal complications, medications, allergies

  • Current labor symptoms: contractions (start time, frequency, duration, intensity), rupture status, bleeding, fetal movement

  • Maternal physical assessment: vital signs, pain, hydration/nutrition, bladder/bowel status

  • Abdominal and uterine assessment: fundal height, contraction pattern (frequency, duration, intensity, resting tone)

  • Fetal assessment: baseline FHR, variability, presence of accelerations/decelerations, monitoring method (intermittent vs continuous)

  • Pelvic exam: cervical dilation, effacement, consistency, position; presenting part, station, membrane status (intact or ruptured); note vaginal bleeding

  • Psychosocial assessment: anxiety, coping, support system, cultural/religious beliefs impacting labor, education about labor/interventions

  • IV access: obtain or saline lock if patient prefers no IV; have IV fluids ready if needed

  • Monitoring: apply fetal monitor (external or internal if indicated); explain process and obtain consent

  • Frequent ongoing assessment during the first stage

  • Maternal vital signs; monitor for hypertension, hypotension, tachycardia, fever

  • Contractions: frequency, duration, intensity; resting uterine tone

  • Fetal status: continuous FHR monitoring if indicated; assess fetal response to contractions (decelerations/accelerations)

  • Pain and coping strategies; discuss pain management options and plan

  • Elimination: bladder distension can impede descent; encourage voiding every 2 hours; catheterize if epidural in place

  • Emotional support and advocacy; keep patient and family informed; document all assessments and interventions

• Second stage of labor: nursing management

  • Time frame: from full cervical dilation to birth of the baby

  • Continuous assessment of maternal and fetal status; watch for signs of distress or maternal fatigue

  • Pain management and coping strategies; coach pushing techniques

  • Pushing guidance and instructions

  • Guide pushing timing with contractions; teach open-glottis pushing and coordinate with contractions

  • Encourage rest between pushes when appropriate (especially with epidural)

  • Uterine and bladder management; ensure bladder is empty to facilitate descent

  • Positioning and movement to aid rotation and descent; support person included in coaching

  • Perineal protection to reduce tearing; observe for crowning and perineal swelling

  • Fetal monitoring during second stage (often continuous in high-risk or if fetal status changes)

  • Documentation and communication with the provider; prepare for delivery and neonatal care if needed

• Third stage of labor: delivery of the placenta

  • Focus on preventing hemorrhage and promoting bonding

  • Ongoing maternal assessment: vital signs, fundal palpation (firm, midline, below umbilicus), monitor bleeding and note color/amount/clots

  • Assess perineal status for lacerations, episiotomy, hematoma; assess pain and readiness for repair as needed

  • Monitor epidural effectiveness; provider may perform repair with local anesthesia

  • Placental assessment: ensure membranes intact and placenta complete; assess placenta after delivery

  • Uterotonic administration post-delivery to prevent postpartum hemorrhage (e.g., oxytocin)

  • Promote mother-infant bonding (skin-to-skin when feasible) and early breastfeeding encouragement

  • Documentation: time of placenta delivery, placental condition, medications given, and maternal status

• Fourth stage of labor: the first 1–4 hours postpartum

  • Focus on maternal stabilization and prevention of hemorrhage; confidence-building for mother-infant bonding

  • Vital signs: every 15 minutes for the first hour, then every 30 minutes for the next 1–2 hours

  • Fundal assessment and massage if boggy; assess fundal height and midline position

  • Lochia assessment: monitor amount, color, and odor; quantify blood loss; observe for clots

  • Perineal and episiotomy/hematoma assessment; watch for edema or signs of infection

  • Bladder assessment: encourage voiding to prevent uterine displacement and increased bleeding; monitor urinary output

  • Monitor uterotonic medications and continue fundal massage as needed

  • Provide reassurance and ongoing support; involve family in newborn care when appropriate

  • Goals: prevent postpartum hemorrhage, infection; support maternal-infant bonding and adapt care to postpartum changes

• Practical and ethical aspects in nursing care during labor

  • Advocacy: support patient birth plan while ensuring safety and infant well-being; communicate and negotiate with providers when needed

  • Open communication: inform patient and family about condition and plan; avoid hiding information; maternal distress can be evident in facial expressions and body language

  • Balance data with clinical judgment: use monitoring data in conjunction with the clinical context for individualized care

• Quick reference summary (key numbers and thresholds)

  • Normal baseline FHR: $110 \leq \text{FHR}_{\text{baseline}} \leq 160\ \text{bpm}$

  • Tachycardia: \text{FHR}_{\text{baseline}} > 160\ \text{bpm} \text{ for } \ge 10\ \text{minutes}

  • Bradycardia: \text{FHR}_{\text{baseline}} < 110\ \text{bpm} \text{ for } \ge 10\ \text{minutes}

  • Variability: Absent, Minimal (\le 5 bpm), Moderate (6–25 bpm), Marked (>25 bpm)

  • Accelerations: $\Delta \text{FHR} \ge 15\ \text{bpm} \text{ for } \ge 15\ \text{seconds}$

  • Prolonged decelerations: $\Delta \text{FHR} \ge 15\ \text{bpm} \text{ for } 2-10\ \text{minutes}$

  • Category I–III tracings: use definitions above to guide interventions

• Practical note on monitoring modalities and positioning

  • Wireless external monitors improve mobility but signal reliability varies

  • Internal monitoring (FSE/IUPC) provides precise data but requires membranes to be ruptured and cervix dilation; ensure infection control and patient comfort

  • When to escalate: persistent Category II with concerning features or any Category III pattern requires prompt action and likely delivery planning

• Apgar score reference (brief mention)

  • Apgar scoring is used to assess newborn condition at birth; nursing and delivery teams coordinate immediate care and identification for newborns

• Summary takeaways

  • FHR monitoring is central to assessing fetal well-being and guiding interventions during labor

  • Understanding baseline, variability, accelerations, and decelerations, plus tracing categories, helps determine stability and urgency

  • Movement between monitoring modalities, and early, decisive nursing actions, support safer labor outcomes

  • Pain management and comfort measures should be individualized and aligned with safety and fetal status

  • Clear documentation, patient advocacy, and teamwork with providers are essential for positive birth experiences and safety