Core Nursing Explanation
Key Concept Analysis: This question assesses your ability to identify the normal characteristics of
Active labor, which is part of the
First stage of labor. The first stage is divided into three phases: Latent, Active, and Transition. The key to answering this question is recognizing the contraction pattern, cervical dilation, and effacement that define the active phase.
Answer Rationale:
Key Point! For a primigravida at 38 weeks, normal progression into active labor is characterized by
regular, frequent, and strong contractions along with significant cervical change. Option ③ describes contractions every 3-4 minutes, lasting 45-60 seconds, with moderate to strong intensity. This pattern is the classic hallmark of the active phase, where cervical dilation typically progresses from about 6 cm to 10 cm. This indicates effective labor and normal progression.
Distractor Analysis:
Watch out for confusion! Option ① describes contractions every 8-10 minutes lasting 30 seconds. This pattern is characteristic of
Early or Latent labor, not active labor. The contractions are too infrequent, too short, and of mild intensity.
Watch out for confusion! Option ② describes a cervix that is 2 cm dilated and 25% effaced. This is also a finding of
Latent labor. While it's a normal finding for that early phase, it does not indicate progression into the active phase of the first stage.
Watch out for confusion! Option ④ presents a
Fetal Heart Rate (FHR) baseline of 110 bpm (the lower limit of normal is
110-160 bpm) with
Late decelerations. Late decelerations are a
non-reassuring fetal status indicating possible uteroplacental insufficiency. This is an abnormal finding requiring intervention, not an indicator of normal labor progress.
Related Concepts: Understanding the stages and phases of labor is fundamental. The first stage ends with full cervical dilation (10 cm). The second stage is from full dilation to delivery of the baby. The third stage is from delivery of the baby to delivery of the placenta. Nursing assessments must continuously monitor both maternal progress (contractions, cervix) and fetal well-being (FHR patterns).
Concept Summary
| Labor Phase (First Stage) | Cervical Dilation | Contraction Pattern | Duration (Primigravida) |
| Latent (Early) Phase | 0 to 6 cm | Irregular to regular, mild, 5-30 min apart, 30-45 sec long | Up to 20 hours |
| Active Phase | 6 to 10 cm | Regular, moderate to strong, 3-5 min apart, 45-60 sec long | Up to 8 hours |
| Transition Phase | 8 to 10 cm | Strong to very strong, 2-3 min apart, 60-90 sec long | 30 min - 2 hours |
Side-by-Side Comparison!
| Assessment Finding | Indicates... | Nursing Action |
| Contractions q3-4min, 60 sec, strong | Normal Active Labor Progress | Continue monitoring, provide support and comfort measures. |
| FHR with Late Decelerations | Non-reassuring Fetal Status (Abnormal) | Immediate action: Change maternal position (left lateral), administer O2, stop oxytocin if running, notify provider. |
| Cervix 2 cm / 25% effaced | Latent Labor (Early Phase) | May encourage ambulation, hydration, and rest at home if appropriate (depending on protocol). |
Anatomy, Physiology & Pharmacology Points
•
Physiology: Effective labor contractions involve a
fundal dominance pattern—starting at the top (fundus) of the uterus and spreading downward—which is most efficient for cervical dilation and fetal descent.
•
Pharmacology:
Oxytocin (Pitocin) is a drug used to augment labor. It must be titrated carefully to achieve a contraction pattern similar to normal active labor (q2-3 min, lasting