Prehospital Academy Lesson 39.4
Routine Childbirth Overview
This lesson provides an overview of the stages of labor and routine childbirth, crucial knowledge for EMTs who may assist in unexpected deliveries. Understanding the normal progression of labor helps in identifying complications and providing appropriate prehospital care.
Stages of Labor
Labor is typically divided into three main stages, each with distinct characteristics and durations.
First Stage: Begins with the onset of labor pains and ends when the cervix is fully dilated (10 cm).
Characterized by regular uterine contractions that gradually increase in frequency, intensity, and duration.
The amniotic sac (bag of waters) often ruptures towards the end of this stage.
Duration: Varies greatly, but typically 8-12 hours for a nulliparous patient (first pregnancy) and 6-8 hours for a multiparous patient (subsequent pregnancies).
Second Stage: Begins with full cervical dilation and ends with the complete delivery of the newborn.
The mother actively pushes during contractions.
The fetus undergoes several positional changes (mechanisms of labor) to navigate the birth canal, including internal rotation, extension, and external rotation.
Contractions are generally more intense and frequent.
Duration: 1-3 hours for nulliparous; often shorter for multiparous.
Third Stage: Begins immediately after the birth of the newborn and ends with the delivery of the placenta.
Uterine contractions continue, but are less intense, to expel the placenta.
The uterus contracts down to help control hemorrhage by compressing blood vessels.
Duration: Typically 5-60 minutes.
Fetal and Maternal Response to Labor
Both the mother and fetus experience significant physiological changes during labor.
Maternal Response:
Increased workload on the heart, leading to increased heart rate, blood pressure, and cardiac output.
Increased breathing rate.
Increased white blood cell production and protein breakdown.
Fetal Response:
Transient decrease in oxygen and nutrients due to contractions and separation from maternal circulation.
Not uncommon to see a transient decrease in fetal heart rate.
Fetal acidosis is common, but usually resolves after birth.
Prehospital Preparation for Delivery
EMTs should be prepared to assist with delivery, even if it's unexpected.
Scene Safety: Ensure a safe environment for both the patient and providers.
Standard Precautions: Always wear appropriate personal protective equipment (PPE).
Patient Positioning: Encourage the mother to find a comfortable position. While supine is common, other positions may be preferred.
Prepare for Delivery: Gather necessary equipment (e.g., obstetric kit, blankets, bulb syringe, clamps).
Reassurance and Support: Provide calm and continuous emotional support to the mother.
Assess for Impending Delivery: Look for crowning (the fetal head visible at the vaginal opening), strong regular contractions, and the urge to push.
Critical Thinking Questions
Describe the key events that mark the beginning and end of each of the three stages of labor.
A nulliparous patient calls EMS reporting strong, regular contractions every 3 minutes, lasting 60 seconds, and states her "water broke." Upon arrival, you observe crowning. What stage of labor is she likely in, and what are your immediate actions?
How do the physiological responses of the mother (e.g., cardiac output, respiratory rate) change during labor, and why is this important for an EMT to understand?
What are some essential pieces of equipment an EMT should have readily available when anticipating an imminent childbirth, and what is the purpose of each?
Discuss the emotional support an EMT can provide to a patient during childbirth, considering both the physical and psychological aspects of the event.