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Four Stages of Labor | 마이메르시 MyMerci
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Four Stages of Labor

NCLEX Review Guide: Stages of Labor

Overview of Labor

Definition and Onset

  • Labor is the physiologic process by which the fetus, placenta, and membranes are expelled through the birth canal. True labor is characterized by regular, progressive contractions that cause cervical dilation and effacement.
  • Onset of labor is identified by regular uterine contractions that increase in frequency, duration, and intensity, accompanied by progressive cervical changes.

Key Points

  • Differentiate true labor from false labor (Braxton Hicks contractions) by evaluating if contractions are regular, increasing in intensity, and causing cervical change.
  • The 5 P's of labor: Passenger (fetus), Passageway (birth canal), Powers (contractions), Position (maternal), and Psyche (psychological state).

First Stage of Labor

Latent Phase

  • The latent phase begins with the onset of regular contractions and ends when cervical dilation reaches 6 cm. During this time, contractions become progressively more regular and stronger.
  • This phase is characterized by mild to moderate contractions occurring every 5-30 minutes, lasting 30-45 seconds, with gradual cervical effacement and dilation from 0-6 cm.

Active Phase

  • The active phase begins at 6 cm dilation and continues until complete dilation (10 cm). This phase is marked by more rapid cervical dilation and increased contraction intensity.
  • Contractions typically occur every 2-3 minutes, last 45-60 seconds, and are moderate to strong in intensity. The cervix dilates from 6 cm to 10 cm during this phase.

Transition Phase

  • The transition phase is the most intense part of the first stage, occurring as the cervix dilates from 8-10 cm. Women often experience increased discomfort, pressure, and sometimes an urge to push.
  • Contractions are typically very strong, occurring every 1.5-2 minutes and lasting 60-90 seconds with minimal resting time between contractions.

Key Points

  • First stage is the longest stage of labor, lasting an average of 8-12 hours for nulliparas and 5-8 hours for multiparas.
  • Nursing priorities: monitor maternal-fetal well-being, provide comfort measures, encourage position changes, and support hydration.

Clinical Scenario

A 26-year-old G1P0 presents to labor and delivery reporting contractions every 5-7 minutes for the past 3 hours. On examination, her cervix is 4 cm dilated and 50% effaced. The patient is anxious but coping well with breathing techniques. This patient is in the latent phase of the first stage of labor. Appropriate nursing interventions include assessing vital signs, FHR, contraction pattern, encouraging ambulation if membranes are intact, and providing emotional support.

Second Stage of Labor

Characteristics and Duration

  • The second stage begins with complete cervical dilation (10 cm) and ends with the delivery of the baby. This stage is characterized by maternal pushing efforts and fetal descent through the birth canal.
  • Duration varies significantly: typically 20 minutes to 2 hours for multiparas and up to 3 hours for nulliparas (longer if epidural anesthesia is used).

Pushing Techniques

  • Directed pushing involves having the woman hold her breath and push during contractions, typically for counts of 10 seconds, repeated 3-4 times per contraction.
  • Spontaneous pushing allows the woman to push when she feels the urge, following her body's natural reflexes, which may be more physiologic and less fatiguing.

Key Points

  • Cardinal movements of labor: engagement, descent, flexion, internal rotation, extension, external rotation, and expulsion.
  • Nursing priorities: coach effective pushing, monitor FHR more frequently (every 5-15 minutes), assist with position changes, prepare for delivery, and continue emotional support.

Monitor FHR more frequently during second stage (every 5 minutes or after each contraction) as this is a period of increased fetal stress due to head compression and reduced placental perfusion during pushing.

Third Stage of Labor

Placental Delivery

  • The third stage begins immediately after the birth of the baby and ends with the delivery of the placenta. This stage involves placental separation, descent, and expulsion.
  • Signs of placental separation include a small gush of blood, lengthening of the umbilical cord, and a change in uterine shape from discoid to globular.

Management Approaches

  • Active management includes prophylactic administration of oxytocic medications (oxytocin), controlled cord traction, and uterine massage to reduce bleeding risk.
  • Expectant (physiologic) management involves waiting for natural placental separation without medications or cord traction, which may take 15-30 minutes.

Key Points

  • Third stage typically lasts 5-30 minutes; if longer than 30 minutes, it's considered a retained placenta requiring medical intervention.
  • Nursing priorities: administer oxytocin as ordered, assess for placental separation signs, monitor for excessive bleeding, inspect placenta for completeness.

Fourth Stage of Labor

Recovery Period

  • The fourth stage begins after delivery of the placenta and lasts approximately 1-2 hours, representing the initial recovery period where maternal physiologic systems begin to stabilize.
  • This critical period requires close monitoring as most immediate postpartum complications, particularly hemorrhage, occur during this time.

Nursing Assessments

  1. Assess vital signs every 15 minutes for the first hour, then every 30 minutes if stable.
  2. Evaluate uterine tone and fundal position every 15 minutes; the fundus should be firm and at or below the umbilicus.
  3. Monitor lochia (color, amount, odor) with each fundal check.
  4. Assess bladder fullness, as a distended bladder can displace the uterus and contribute to hemorrhage.
  5. Evaluate perineal integrity and repair if present.

Key Points

  • The uterus typically expels 500-1000 mL of blood during normal vaginal delivery; blood loss exceeding this range indicates postpartum hemorrhage.
  • Nursing priorities: prevent hemorrhage through fundal massage, promote bladder emptying, initiate breastfeeding, monitor vital signs, and provide comfort measures.

Postpartum hemorrhage is a leading cause of maternal mortality. Immediate recognition and intervention are critical. A blood loss exceeding 500 mL for vaginal delivery or 1000 mL for cesarean birth requires prompt action.

Commonly Confused Points

True vs. False Labor

Characteristic True Labor False Labor (Braxton Hicks)
Contraction Pattern Regular, increasing in frequency and intensity Irregular, do not progressively increase
Cervical Change Progressive dilation and effacement No cervical change
Pain Location Starts in back, radiates to abdomen Usually felt in abdomen only
Effect of Activity Continues or intensifies with walking Often subsides with walking or position change
Response to Sedation Continues despite rest or sedation May subside with rest, hydration, or sedation

Stages of Labor Comparison

Stage Duration (Nullipara) Duration (Multipara) Key Characteristics
First Stage (Latent) 6-10 hours 4-6 hours 0-6 cm dilation, regular contractions establishing
First Stage (Active) 4-6 hours 2-3 hours 6-10 cm dilation, more rapid progress
Second Stage 1-3 hours 20-60 minutes Complete dilation to birth of baby, pushing phase
Third Stage 5-30 minutes 5-30 minutes Birth of baby to delivery of placenta
Fourth Stage 1-2 hours 1-2 hours Immediate recovery period, stabilization

Types of Lochia

Type Timing Characteristics
Lochia Rubra Days 1-3 Bright red, contains blood, decidua, and trophoblastic tissue
Lochia Serosa Days 4-10 Pinkish-brown, serous with less blood
Lochia Alba Days 11-21 Yellowish-white, contains leukocytes, decidua, epithelial cells

Study Tips

Memory Aids

REEDA for Perineal Assessment

  • Redness
  • Edema
  • Ecchymosis (bruising)
  • Discharge
  • Approximation (of wound edges)

The 4 T's of Postpartum Hemorrhage Causes

  • Tone (uterine atony) - most common cause (70-80%)
  • Trauma (lacerations, hematomas)
  • Tissue (retained placental fragments)
  • Thrombin (coagulation disorders)

BUBBLEHE for Labor Assessment

  • Bleeding
  • Uterine activity
  • Bladder
  • Bowels
  • Lochia
  • Emotional status
  • Hygiene
  • Education needs

Common Pitfalls

  • Don't confuse cervical dilation milestones: 6 cm is now considered the threshold between latent and active phase (previously was 4 cm).
  • Remember that multiparous women typically progress faster than nulliparous women through all stages of labor.
  • Don't assume a woman needs to push immediately upon complete dilation; some women benefit from "laboring down" or passive descent before active pushing begins.
  • Avoid confusing normal vs. abnormal labor patterns: first stage should progress at least 1 cm/hour in active phase for nulliparas and 1.5 cm/hour for multiparas.

Quick Check

1. A woman who is 8 cm dilated with strong contractions every 2 minutes is in which phase of labor?

2. What are the signs of placental separation?

3. What is the expected duration of the third stage of labor?

4. What is the primary nursing concern during the fourth stage of labor?

Summary of Key Points

  • Labor progresses through four distinct stages: first stage (cervical dilation from 0-10 cm), second stage (complete dilation to birth), third stage (birth to placental delivery), and fourth stage (immediate recovery period).
  • The first stage is divided into latent phase (0-6 cm) and active phase (6-10 cm), with transition occurring around 8-10 cm.
  • Cardinal movements of fetal descent include engagement, descent, flexion, internal rotation, extension, external rotation, and expulsion.
  • Signs of placental separation include cord lengthening, gush of blood, and change in uterine shape.
  • The fourth stage is critical for maternal stabilization and monitoring for postpartum hemorrhage.
  • Duration of labor varies significantly between nulliparous and multiparous women, with multiparas generally progressing faster.

Self-Assessment Checklist

I can describe the four stages of labor and their key characteristics
I can differentiate between true and false labor
I understand the cardinal movements of labor
I can identify signs of placental separation
I know the critical assessments needed during the fourth stage
I can describe appropriate nursing interventions for each stage of labor
I understand the differences in labor progression between nulliparas and multiparas

Remember that understanding the normal progression of labor is essential for recognizing deviations that require intervention. As a nurse, your knowledge of these stages will help you provide appropriate care, support, and education to women during one of the most significant experiences of their lives. Keep reviewing these concepts and visualizing the labor process to solidify your understanding!

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