Obstetrics Book


Fetal Heart Tracing

Aka: Fetal Heart Tracing, Fetal Heart Tones, Fetal Heart Rate, FHR, FHT, Continuous Electronic Fetal Monitoring, CEFM, Structured Intermittent Auscultation, SIA, Reassuring Fetal Heart Tracing, Non-reassuring Fetal Heart Tracing, Ominous Fetal Heart Tracing
  1. See Also
    1. Fetal Assessment
    2. Fetal Testing Indications
  2. Monitoring Options
    1. Continuous Electronic Fetal Monitoring (CEFM)
      1. Indicated in high risk pregnancy (see efficacy below)
      2. See Peripartum Risk to the Fetus
    2. Structured Intermittent Auscultation (SIA)
      1. Contraindications
        1. High risk maternal or fetal risk factors
        2. See Peripartum Risk to the Fetus
      2. Requirements
        1. Requires one-to-one nursing (q15 minute monitoring)
        2. Nurses must be skilled in FHR auscultation
        3. Nurses must be able to palpate contractions
        4. Non-reassuring findings require clinical evaluation
      3. Monitoring frequency
        1. Stage 1:
          1. Low Risk: Every 15-30 minutes
          2. High risk: Every 15 minutes
        2. Stage 2:
          1. Low Risk: Every 5-15 minutes
          2. High Risk: Every 5 min or after each contraction
        3. Other indications as needed
          1. Before and after procedure (e.g. AROM, IUPC)
          2. Before and after ambulation
          3. Before and after medication including anesthesia
          4. Abnormal uterine contraction pattern
          5. After vaginal examination
      4. Procedure
        1. Baseline Fetal Heart Rate (FHR)
          1. Auscultate and count FHR for 60 seconds
          2. Perform between contractions
        2. Fetal response to labor
          1. Auscultate and count FHR for 60 seconds
          2. Perform immediately after contraction
        3. Variability assessment
          1. See FHR Variability
  3. Efficacy: Continuous Electronic Fetal Monitoring (CEFM)
    1. CEFM does not significantly improve fetal outcome
      1. Only measurable benefits
        1. Fewer Neonatal Seizures
        2. Good tracing is reassuring for good outcome
      2. No benefit in APGAR Scores
      3. No decrease in NICU admissions
      4. No change in perinatal death rate
      5. No reduction in Cerebral Palsy
        1. Non-reassuring tracing does not predict bad outcome
        2. False Positive Rate 99.8% if ominous tracing
          1. Late Decelerations
          2. Decreased variability
    2. CEFM increases the risk of surgical intervention
      1. Increases ceserean rate by 160%
      2. Increases operative Vaginal Delivery rate
    3. Consider Informed Consent for CEFM
      1. CEFM may be indicated in high risk pregnancies
      2. Consider intermittent monitoring if low risk
    4. References
      1. Luthy (1987) Obstet Gynecol 69(5):687-95 [PubMed]
      2. Leveno (1986) N Engl J Med 315(10):615-19 [PubMed]
  4. Interpretation
    1. Based on either method of auscultation (CEFM or SIA)
      1. CEFM: Graphical tracing of FHR and contractions
      2. SIA: Baseline and 60 sec before/after contractions
    2. Approach Mnemonic: DR C BRAVADO
      1. Determine Risk
        1. See Peripartum Risk to the Fetus
        2. Assign low, medium or high risk (see prenatal risk factors)
      2. Contractions
        1. Assess rate, rhythm, frequency, duration, intensity, and resting tone
      3. Baseline RAte
        1. Bradycardia (<110 bpm)
        2. Tachycardia (>160 bpm)
        3. Rising baseline
      4. Variability
        1. Absent or minimal variability suggests CNS Activity
      5. Accelerations
        1. Reassuring accelerations are >15 bpm above baseline for 15 seconds (if preterm >10 bpm for 10 seconds)
      6. Decelerations
        1. See Variable Decelerations
        2. See Late Decelerations
      7. Overall Assessment
        1. See Nonreassuring Fetal Status
  5. Signs: Reassuring
    1. Normal baseline (120-160)
    2. Moderate Fetal Bradycardia (100-120), good variability
    3. Good beat-to-beat variability (STV)
    4. Accelerations
      1. Heart Rate increases by 15-25 bpm over baseline
      2. Increase persists for 15-25 seconds
    5. Early Decelerations
      1. Suggests head compression with contraction
    6. Mild Variable Decelerations
  6. Signs: Non-Reassuring
    1. Fetal Tachycardia (>160)
    2. Moderate Fetal Bradycardia (100-120), lost variability
    3. Absent beat-to-beat variability (STV)
    4. Marked Fetal Bradycardia (90-100 bpm)
    5. Moderate Variable Decelerations
    6. Variable Decelerations
    7. Early Decelerations and slow return baseline
  7. Signs: Ominous
    1. Fetal Tachycardia with loss of variability
    2. Prolonged marked Fetal Bradycardia (<90 bpm)
    3. Late Decelerations
    4. Severe Variable Decelerations
      1. Fetal Heart Rate drops below 70 beats per minute
      2. Deceleration persists for 1 minute or more
  8. References
    1. Bailey (2000) ALSO, E:1-13
    2. Gabbe (2002) Obstetrics, p. 395
    3. (2009) Obstet Gynecol 114(1): 192-202 [PubMed]
    4. Bailey (2009) Am Fam Physician 80(12): 1388-98 [PubMed]
    5. Rylander (2001) Clin Fam Pract 3(2):287-305 [PubMed]

Heart Rate, Fetal (C0018811)

Definition (NCI) The number of fetal cardiac beats per minute.
Definition (MSH) The heart rate of the FETUS. The normal range at term is between 120 and 160 beats per minute.
Concepts Finding (T033)
MSH D006340
SnomedCT 249043002
English Fetal Heart Rate, Fetal Heart Rates, Heart Rates, Fetal, Rate, Fetal Heart, Rates, Fetal Heart, heart sounds fetal heart rate ___ bpm, fetal heart rate, fetal heart rate (physical finding), Heart Rate, Fetal, foetal heart rate, heart rate fetal, fetal heart rates, Foetal heart rate, Fetal heart rate, FHR - Fetal heart rate, Fetal heart rate (observable entity)
Italian Battito cardiaco fetale, Frequenza cardiaca fetale
Swedish Hjärtfrekvens hos foster
Japanese タイジシンパクスウ, 胎児心拍数, 心拍数-胎児
Czech srdeční frekvence fetální, Srdeční frekvence plodu
Finnish Sikiön syketiheys
French Fréquence cardiaque du foetus, RCF (Rythme Cardiaque Foetal), Rythme cardiaque du foetus, Fréquence cardiaque foetale, Rythme cardiaque foetal
Spanish Frecuencia Cardíaca Fetal, frecuencia cardíaca fetal (entidad observable), frecuencia cardíaca fetal, Ritmo cardiaco fetal
Polish Częstość pracy serca płodu, Częstość skurczów serca płodu
Hungarian Magzati szívfrekvencia, Foetalis szívfrekvencia
Norwegian Føtal hjertefrekvens, Hjertefrekvens, føtal
Portuguese Frequência cardíaca fetal, Frequência Cardíaca Fetal
Dutch foetale hartfrequentie, Foetale hartfrequentie, Frequentie, foetale hart-, Hartfrequentie, foetale
German fetale Herzfrequenz, Fetale Herzfrequenz, Herzschlagfrequenz, fetale
Derived from the NIH UMLS (Unified Medical Language System)

Sia (C1225105)

Concepts Eukaryote (T204)
English jerusalem cricket, Sia
Derived from the NIH UMLS (Unified Medical Language System)

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