Intrauterine Resuscitation

Introduction to Intrauterine Resuscitation

Intrauterine resuscitation is a critical intervention for abnormal fetal heart rate (FHR) patterns, with guidelines supported by the American College of Obstetricians and Gynecologists and the National Institute of Child Health and Human Development (NICHD) 1

A normal contraction pattern should have no more than 5 contractions in a 10-minute period (averaged over 30 minutes) 1
Implementing continuous electronic fetal monitoring can help assess for late decelerations or other abnormal patterns that may indicate fetal distress 1
Normal fetal heart rate (FHR) ranges from 110 to 160 beats per minute (bpm), characterized by a baseline rate of 110-160 bpm, moderate variability of 6-25 bpm, presence of accelerations, and absence of decelerations, as classified by the NICHD as a Category I pattern, indicating normal fetal acid-base status and well-being 1

The NICHD classifies EFM tracings into three categories:

Category	Description	Management
Category I	Normal	Routine monitoring [1]
Category II	Indeterminate	Careful evaluation and increased surveillance [1]
Category III	Abnormal	Immediate intervention and expedited delivery [1]

Category II EFM tracings are associated with a 5-fold higher risk of low 1-minute Apgar scores compared to Category I, according to the NICHD 1

Moving to left lateral position can improve uteroplacental perfusion, ensuring adequate venous return from the inferior vena cava 1, 2
Administering 6-10 L/min of oxygen via face mask can increase fetal oxygenation during periods of compromised uteroplacental perfusion 1

Discontinuing oxytocin infusion is recommended if in use, as it can help prevent hyperstimulation with prolonged contractions 1
Considering terbutaline as a tocolytic agent can relax the uterus if contraction doesn't resolve with above measures, although evidence for improved neonatal outcomes is limited 1

Administering a physiologic solution as an IV fluid bolus can improve maternal volume status and uteroplacental perfusion 1
Preparing for possible expedited delivery is recommended if fetal heart rate shows category III patterns, and obtaining obstetrical consultation is advised 1
The American College of Obstetricians and Gynecologists recommends discontinuing oxytocin, implementing intrauterine resuscitation measures, and considering expedited delivery via operative vaginal delivery or cesarean section for Category III patterns 1

Cardiovascular disease, present in up to 4% of pregnancies, can lead to compromised uteroplacental perfusion, according to the American College of Radiology 3
Hypertensive disorders, the most frequent cardiovascular events during pregnancy (6-8% of pregnancies), can affect fetal heart rate patterns, as reported by the American College of Radiology 4
Fetal growth restriction (FGR) is associated with placental dysfunction and abnormal Doppler findings, according to the American College of Radiology 5

Proper documentation of all interventions and their timing is essential to establish appropriate care was provided, and to minimize litigation risk, as recommended by the American Family Physician 1
The "onset of bradycardia to delivery interval" is a critical metric that should be minimized to prevent adverse outcomes, according to the American Family Physician 1
Cord blood gases should be obtained after delivery to document fetal acid-base status, particularly when delivery was expedited for abnormal FHR tracings, as recommended by the American Family Physician 1