Cardiotocography: CTG antepartum and intrapartum

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Cardiotocography: CTG antepartum and intrapartum

Transcript of Cardiotocography: CTG antepartum and intrapartum

  • CTG Aboubakr Elnashar Benha University Hospital, EgyptAboubakr Elnashar
  • Antepartum CTG Aboubakr Elnashar
  • Fetal heart rate recording 1.CTG 2.NST 3.Contraction stress test 4.Nipple stimulation test 5.Acoustic stimulation test 6.Computerized CTG Aboubakr Elnashar
  • 1. The Non-Stress Test (NST) (Hammacher et al, 1960) Idea: FHR accelerations: linked closely with fetal movements {increased sympathetic output}. The long term variability: {balance between sympathetic & parasympathetic tone} The short term variability (baseline or bandwidth variability) {parasympathetic tone}. Aboubakr Elnashar
  • Steps: 1. left lateral recumbent position. 2. Place and adjust the external tocodynamometer and ultrasound transducer to obtain the best possible tracing. 3. Instruct the patient to record fetal movements on the monitor tracing using the event marker. 4. Observe the EFM tracing until the criteria for a reactive test are met (minimum of 20 mins and maximum of 60 mins). Aboubakr Elnashar
  • In the event of lack of fetal movement, apply stimulation e.g. fetal acoustic stimulator. Record any relevant clinical information on the EFM tracing e.g. blood pressure, temperature, maternal heart rate, loss of contact changes in maternal position. Aboubakr Elnashar
  • Interpretation: Reactive: 2 accelerations of FHR in 20 min. Each acceleration 15 beat & lasts 15 secs. Non-reactive: no accelerations in 40 min. Aboubakr Elnashar
  • Reactive: increase of FHR to >15 beats/min for > 15 sec following fetal movements Aboubakr Elnashar
  • Nonreactive nonstress test followed by contraction stress test showing mild late decelerations. CS was performed and the severely acidemic fetus could not be resuscitated. Aboubakr Elnashar
  • Positive CST= late deceleration in 50% of UC. Non reactive NST= No HR acceleration Cessation of fetal movement Basal line tachycardia > 160 bpm Basal line bradycardia 15 beats for> 15 seconds in 20 min) No decelerations. Aboubakr Elnashar
  • 2. Suspicious/Equivocal Trace. Baseline HR: 150-170 b/m or 100-110 b/m Variability: Reduced (5-10 b/m for >40 m) Absence of accelerations for >40 m Sporadic deceleration of any type. Aboubakr Elnashar
  • 3. Abnormal/Pathological Baseline HR: 170 b/m Variability: No area of normal baseline variability Silent Pattern (40 min Sinusoidal pattern (oscillation frequency= 2-5 cycles/min, amplitude of 5-15 b/m) for >40 m No accelerations Repeated late, prolonged (> 1 minute) and severe variable (>40 b/m) decelerations. Aboubakr Elnashar
  • A: Absence of accelerations, diminished variability, late decelerations with weak spontaneous contractions. B: Normal accelerations Normal variability 15 beat Aboubakr Elnashar
  • CTG: Tachycardia Sinusoidal pattern Late deceleration Aboubakr Elnashar
  • Intrapartum CTG Aboubakr Elnashar
  • Basal Heart Rate Activity Rate: Normal:110-160 increment 5 bpm (10 m segment) Bradycardia: < 110 bpm Tachycardia: > 160bpm Variability :Short term= instantaneous (beat to beat v.) :Long term= oscillatory changes in 1 m Sinusoidal: :Mild is due to sedation :Marked is due to fetal anemia Arrhythmia: Abrupt spiking, bradycardia or tachy Periodic heart rate Activity Acceleration Deceleration Aboubakr Elnashar
  • Baseline The mean FHR rounded to increments of 5 bpm during a 10-min segment, excluding: Periodic or episodic changes Periods of marked FHR variability Segments of baseline that differ > 25 bpm Tachycardia Baseline FHR > 160 bpm Bradycardia Baseline FHR < 110 bpm Aboubakr Elnashar
  • Fetal bradycardia measured with a scalp electrode in a pregnancy complicated by placental abruption and subsequent fetal death. Aboubakr Elnashar
  • Placental abruption. In the upper panel, the fetal scalp electrode first detected the heart rate of the dying fetus. After fetal death, the maternal electrocardiogram complex is detected and recorded. The second panel displays an absence of uterine contractions. Aboubakr Elnashar
  • Variability Reduced variability is the single most reliable sign of fetal compromise The baseline must be for a minimum of 2 min in any 10-min segment Fluctuations in the FHR of two cycles per min or greater Aboubakr Elnashar
  • Variability is visually quantified as the amplitude of peak-to-trough in bpm Absent: amplitude range undetectable Minimal: amplitude range detectable but 5 bpm Moderate (normal): amplitude range 625 bpm Marked: amplitude range > 25 bpm Aboubakr Elnashar
  • Short-term beat-to-beat variability measured by a fetal scalp electrode (t= time interval between successive fetal R waves). Aboubakr Elnashar
  • long-term beat-to-beat variability ranging between 125 and 135 bpm). Aboubakr Elnashar
  • (1) Undetectable or absent (2) Minimal variability:0 -5 bpm Aboubakr Elnashar
  • 4) Marked variability : >25 bpm (3)Moderate variability : >5-60 bpm for >60 seconds changes in shape: over-shoot, decreased or increased baseline FHR following the decelerations,or absence of baseline variability in or between decelerations, slow recovery Aboubakr Elnashar
  • Variable decelerations. abrupt decrease in the heart rate with onset commonly varying with successive contractions. decelerations measure 15 bpm for 15 seconds or longer Onset to nadir phase of less than 30 seconds. Total duration is less than 2 minutes. Aboubakr Elnashar
  • Variable decelerations B shoulders of acceleration compared with deceleration A. Aboubakr Elnashar
  • FHR effects of partial occlusion and complete occlusion of the umbilical cord Aboubakr Elnashar
  • 4. Prolonged deceleration Visually apparent decrease in the FHR below the baseline Deceleration is 15 bpm, lasting 2 min but < 10 min from onset to return to baseline Aboubakr Elnashar
  • Abrupt decrease >15 bpm Often drops2 m & < 10 m Variable pattern Prolonged deceleration {uterine hyperactivity} Approximately 3 minutes are shown but FHR returned to normal after uterine hypertonus resolved. Vaginal delivery later ensued. Aboubakr Elnashar
  • Fetal heart rate effects of manual compression of a prolapsed umbilical cord in a 25-week footling breech. A shows the effects of 25- second compression compared with 40 seconds in B. Aboubakr Elnashar
  • Early Deceleration Late Deceleration Variable Deceleration Abrupt decrease >15 bpm Often drops15 S& < 2 m Variable pattern Abrupt decrease >15 bpm Often drops2 m & < 10 m Variable pattern Prolonged Deceleration may drops15 seconds) in 20 minutes - Baseline heart rate: 110-150 bpm - Baseline variability: 5-25 bpm - Early decelerations (in late first stage of labour) Aboubakr Elnashar
  • b)Suspicious/Equivocal Trace - Absence of accelerations for >40 minutes (non reactive) - Baseline heart rate: 150-170 bpm or 100-110 bpm (normal variability, no decelerations) - Silent pattern (40 minutes) although normal baseline (110-150 bpm), no decelerations - Baseline variability >25 bpm in the absence of accelerations - Variable decelerations (depth 90 minutes - Complicated variable decelerations (depth >60 bpm for >60 seconds, changes in shape: over-shoot, decreased or increased baseline FHR following the decelerations, or absence of baseline variability in or between decelerations, slow recovery) - Combined/biphasic decelerations (variable followed by late) - Prolonged bradycardia in a suspicious trace - Prolonged bradycardia> 10 minutes with no signs of recovery - Repeated late decelerations - Pronounced loss of baseline variability regardless of baseline FHR with shallow late decelerations - Sinusoidal pattern with no accelerations Aboubakr Elnashar
  • Aboubakr Elnashar
  • MANAGEMENT a)Normal/Reassuring risk of fetal hypoxia in spont