Management of Category 2 Tracings with Late Decelerations

Understanding Late Decelerations

Late decelerations reflect uteroplacental insufficiency, with the characteristic delayed timing where the nadir occurs after the peak of the contraction, indicating compromised placental blood flow rather than mechanical compression 1, 4
The physiology involves inadequate oxygen delivery to the fetus through the placenta, which can be caused by maternal hypotension, epidural-related hypotension, or uterine hyperstimulation (tachysystole) 1, 3

The American Academy of Family Physicians recommends discontinuing oxytocin infusion as the primary intervention to reduce uterine activity and improve uteroplacental blood flow 1, 2, 3
Implement general measures including maternal position changes, checking maternal vital signs, administering oxygen at 6-10 L/min, performing vaginal examination, giving IV fluids, and assessing fetal pH with scalp or acoustic stimulation 1, 2, 3
Consider expedited delivery if abnormalities persist despite interventions 1, 2, 3

Stop oxytocin immediately to reduce uterine activity and improve uteroplacental blood flow 1, 5
Change maternal position to left lateral to optimize placental perfusion 5, 6
Administer oxygen at 6-10 L/min to improve fetal oxygenation 1, 5
Give IV fluid bolus if not already administered to ensure adequate maternal hydration 1, 2
Assess maternal blood pressure and treat hypotension if present to ensure adequate uteroplacental perfusion 1, 6
Monitor response and prepare for expedited delivery if pattern persists despite interventions 1, 5