multi class comparison
FHR Deceleration Comparison: Early vs Late vs Variable — Shape, Cause, Intervention
The NCLEX shows you a fetal heart rate tracing and asks what to do next. Picking the wrong deceleration type means calling a benign head-compression pattern ominous — or worse, ignoring uteroplacental insufficiency that's starving the fetus of oxygen. Shape, timing, and cause each point to a different intervention.
Comparison
Side-by-side3 compared
Comparevs
Dimension
Early Decelerations
Late Decelerations
Variable Decelerations
Cause / mechanism
- Fetal head compression against cervix
- ★Uteroplacental insufficiency → ↓ O₂
- ★Umbilical cord compression
Shape & timing on tracing
- Gradual U; mirrors the contraction exactly
- Onset to nadir ≥ 30 sec
- Gradual U; nadir AFTER contraction peak
- Delayed recovery; shifted right
- Abrupt V/W; no relation to contraction
- Onset to nadir < 30 sec
Significance
- Benign; normal physiologic response
- OMINOUS — fetal hypoxemia
- Concerning if repetitive or losing variability
Nursing intervention
- None needed; continue monitoring
- ★Reposition left lateral; IV bolus; O₂
- STOP oxytocin immediately
- Reposition (side-lying, knee-chest)
- Amnioinfusion may be ordered
Notify provider — escalate
- No — document, routine care
- Notify immediately; prep for possible cesarean
- Yes if recurrent, prolonged > 60 s, or slow return
Associated conditions
- Active labor; fetal head engagement
- Post-dates, preeclampsia, abruption, hypotension
- Oligohydramnios; cord prolapse; 2nd stage
Cause / mechanism
Early Decelerations
- Fetal head compression against cervix
Late Decelerations
- ★Uteroplacental insufficiency → ↓ O₂
Shape & timing on tracing
Early Decelerations
- Gradual U; mirrors the contraction exactly
- Onset to nadir ≥ 30 sec
Late Decelerations
- Gradual U; nadir AFTER contraction peak
- Delayed recovery; shifted right
Significance
Early Decelerations
- Benign; normal physiologic response
Late Decelerations
- OMINOUS — fetal hypoxemia
Nursing intervention
Early Decelerations
- None needed; continue monitoring
Late Decelerations
- ★Reposition left lateral; IV bolus; O₂
- STOP oxytocin immediately
Notify provider — escalate
Early Decelerations
- No — document, routine care
Late Decelerations
- Notify immediately; prep for possible cesarean
Associated conditions
Early Decelerations
- Active labor; fetal head engagement
Late Decelerations
- Post-dates, preeclampsia, abruption, hypotension
★ marks the fact that sets a column apart.
Clinical Pearl
Early = Head = benign. Late = Placenta = ominous, stop pit. Variable = Cord = reposition.
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