Labour and Delivery: Stages of Labour, Fetal Heart Rate Monitoring, Complications

Labour and Delivery: Stages of Labour, Fetal Heart Rate Monitoring, Complications

A high-density, practical guide for nurses, midwives, and medical professionals.

What Is This?

Labour and delivery is the physiological process by which a fetus and placenta are expelled from the uterus. This guide covers the stages of labour, fetal heart rate (FHR) monitoring, and common complications—critical knowledge for safe childbirth management.

Why it matters today: - 1 in 10 births involves complications (WHO). - FHR monitoring reduces neonatal hypoxia and stillbirth by 30% (Cochrane Review). - Delayed recognition of complications is a leading cause of maternal and fetal morbidity.

Why It Matters

• Saves lives: Timely intervention prevents postpartum hemorrhage (PPH), fetal distress, and maternal death.
• Legal accountability: Misinterpreted FHR patterns or missed complications can lead to malpractice claims.
• Global health impact: 94% of maternal deaths occur in low-resource settings (WHO)—proper labour management can reduce this.

Core Concepts

1. Stages of Labour

Labour progresses in three stages, each with distinct physiological and clinical markers.

Key terms: - Effacement: Thinning of the cervix (0–100%). - Station: Fetal descent (-5 to +5, relative to ischial spines). - Moulding: Overlapping of fetal skull bones (normal in prolonged labour).

2. Fetal Heart Rate (FHR) Monitoring

Goal: Detect fetal hypoxia (oxygen deprivation) before irreversible damage occurs.

Methods

FHR Interpretation (NICHD Categories)

Key patterns: - Early decelerations: Mirror contractions (head compression—normal). - Late decelerations: Begin after contraction peak (uteroplacental insufficiency—emergency). - Variable decelerations: Abrupt, V-shaped (cord compression—reposition mother). - Sinusoidal pattern: Smooth, wave-like (fetal anemia or hypoxia—immediate delivery).

3. Common Complications

Maternal Complications

Fetal Complications

How It Works: The Labour Process

1. Onset of Labour:
2. Hormonal triggers: Prostaglandins soften cervix; oxytocin stimulates contractions.

3. Mechanical triggers: Fetal head pressure on cervix-Ferguson reflex (oxytocin release).

4. First Stage (Cervical Dilation):

5. Latent phase: Irregular contractions-prostaglandin release-cervical effacement.

6. Active phase: Regular contractions-oxytocin surge-rapid dilation (1 cm/hr).

7. Second Stage (Expulsion):

8. Fetal descent: Engagement-internal rotation-extension-restitution-expulsion.

9. Maternal pushing: Ferguson reflex (urge to push) + voluntary effort.

10. Third Stage (Placental Delivery):

11. Uterine contractions-placental separation (Schultze or Duncan mechanism).

12. Oxytocin prevents PPH by contracting uterine blood vessels.

13. Fourth Stage (Recovery):

14. Uterine involution: Fundus descends ~1 cm/day.
15. Lochia: Postpartum bleeding (rubra-serosa-alba).

Hands-On: FHR Monitoring & Complication Management

Prerequisites

• Knowledge: Anatomy of the uterus, fetal circulation, NICHD FHR categories.
• Equipment:
• Doppler/ultrasound (IA).
• External tocodynamometer + FHR monitor (EFM).
• Fetal scalp electrode (FSE) for internal monitoring.
• Emergency cart (oxytocin, magnesium sulfate, Bakri balloon).

Step-by-Step: Interpreting FHR Tracings

1. Assess baseline:
2. Average FHR over 10 min (exclude accelerations/decelerations).

3. Normal: 110–160 bpm.

4. Evaluate variability:

5. Absent: <5 bpm (hypoxia, acidosis).
6. Minimal: 5–10 bpm (sleep cycle, magnesium sulfate).
7. Moderate: 6–25 bpm (reassuring).

8. Marked: >25 bpm (fetal stimulation, early hypoxia).

9. Identify accelerations:

10. ?15 bpm rise for ?15 sec (fetal well-being).

11. Classify decelerations:

12. Early: Mirror contractions (head compression).
13. Late: Begin after contraction peak (uteroplacental insufficiency).

14. Variable: Abrupt, V-shaped (cord compression).

15. Assign NICHD category:

16. Category I: Continue routine care.
17. Category II: Intervene (reposition, O?, IV fluids).
18. Category III: Emergency C-section.

Expected Outcome

• Reassuring FHR: Continue labour with intermittent monitoring.
• Non-reassuring FHR: Correct reversible causes (e.g., hypotension, cord compression) or expedite delivery.

Common Pitfalls & Mistakes

1. Misinterpreting FHR variability:
2. Mistake: Assuming minimal variability always means hypoxia.

3. Fix: Check for fetal sleep cycles (lasts 20–40 min) or maternal sedation (e.g., magnesium sulfate).

4. Ignoring maternal vital signs:

5. Mistake: Focusing only on FHR while missing maternal tachycardia (early sign of hemorrhage).

6. Fix: Check BP, HR, and fundal tone q15 min in 4th stage.

7. Overusing oxytocin:

8. Mistake: Increasing oxytocin despite tachysystole (>5 contractions in 10 min).

9. Fix: Stop oxytocin, reposition, IV fluids, O?.

10. Delaying C-section for Category III FHR:

11. Mistake: Waiting for "improvement" in a sinusoidal pattern.

12. Fix: Call for C-section immediately (decision-to-delivery time <30 min).

13. Poor documentation:

14. Mistake: Writing "FHR reassuring" without details.
15. Fix: Document baseline, variability, accelerations, decelerations, and interventions.

Best Practices

Labour Management

• Low-risk labour: Use intermittent auscultation (q15–30 min in active labour).
• High-risk labour: Continuous EFM (e.g., preeclampsia, meconium, oxytocin).
• Second stage: Delay pushing until urge is strong (reduces fetal distress).
• Third stage: Active management (oxytocin, controlled cord traction, fundal massage).

FHR Monitoring

• Reposition mother (left lateral) for variable decelerations.
• Administer O? (10 L/min via non-rebreather) for late decelerations.
• Stop oxytocin if tachysystole or non-reassuring FHR.
• Amnioinfusion for recurrent variable decelerations (cord compression).

Complication Response

• PPH: Massage fundus-oxytocin-misoprostol-Bakri balloon-surgery.
• Shoulder dystocia: McRoberts-suprapubic pressure-episiotomy (last resort).
• Cord prolapse: Knee-chest position-manual elevation-emergency C-section.

Tools & Frameworks

Real-World Use Cases

1. Low-Risk Vaginal Birth (Midwife-Led Unit)
2. Scenario: Primigravida at 40 weeks, spontaneous labour, no complications.
3. Management: Intermittent auscultation, upright positioning, delayed cord clamping.

4. Outcome: Uncomplicated delivery, skin-to-skin contact, early breastfeeding.

5. High-Risk Labour (Obstetric Unit)

6. Scenario: 38-week gestation, preeclampsia, Category II FHR (late decelerations).
7. Management: Continuous EFM, magnesium sulfate, IV fluids, emergency C-section.

8. Outcome: Stable mother, neonate admitted to NICU for observation.

9. Emergency Shoulder Dystocia (Delivery Room)

10. Scenario: "Turtle sign" after head delivery, macrosomic infant.
11. Management: McRoberts maneuver-suprapubic pressure-episiotomy-delivery.
12. Outcome: Infant with Erb’s palsy (resolves in 6 months), mother with 3rd-degree tear.

Check Your Understanding (MCQs)

Question 1

A primigravida at 39 weeks presents in active labour (6 cm dilated). Her FHR baseline is 140 bpm with moderate variability and late decelerations after 50% of contractions. What is the most appropriate next step?

A. Continue monitoring; this is a normal pattern. B. Reposition the mother to left lateral, administer O?, and increase IV fluids. C. Prepare for immediate C-section. D. Perform amnioinfusion to relieve cord compression.

Correct Answer: B Explanation: Late decelerations indicate uteroplacental insufficiency (Category II FHR). Repositioning, O?, and IV fluids improve oxygenation before considering C-section. Why the Distractors Are Tempting: - A: Late decels are never normal—this is a dangerous misconception. - C: C-section is not yet indicated unless interventions fail or FHR worsens to Category III. - D: Amnioinfusion is for variable decels (cord compression), not late decels.

Question 2

A multiparous woman in the second stage of labour suddenly develops bradycardia (FHR 80 bpm) with absent variability. The obstetrician is not immediately available. What is the priority action?

A. Perform a vaginal exam to check for cord prolapse. B. Call for emergency C-section and prepare the OR. C. Administer terbutaline to relax the uterus. D. Apply fundal pressure to expedite delivery.

Correct Answer: A Explanation: Bradycardia + absent variability = Category III FHR (emergency). First, rule out cord prolapse (a reversible cause) via vaginal exam. If cord is palpable, elevate the presenting part and prepare for C-section. Why the Distractors Are Tempting: - B: While C-section is likely needed, first rule out reversible causes (e.g., cord prolapse). - C: Terbutaline is for tachysystole, not bradycardia. - D: Fundal pressure is contraindicated (risk of uterine rupture).

Question 3

A postpartum woman has heavy vaginal bleeding (saturating a pad in 10 minutes). Her fundus is boggy and 3 cm above the umbilicus. What is the first intervention?

A. Administer oxytocin 10 units IM. B. Massage the fundus vigorously. C. Insert a Bakri balloon. D. Prepare for emergency hysterectomy.

Correct Answer: