How long do contractions last during second stage of labor at an interval of 3-5 minutes of rest?

Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Obstetrics & Gynaecology

Easy

Appeared in: Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Explanation

The second stage of labor begins with complete cervical dilation (10 cm) and ends with the birth of the baby.
During this stage, uterine contractions are at their most powerful to facilitate the expulsion of the fetus.
According to clinical guidelines, contractions in the second stage typically last for 45 to 90 seconds.
These strong, sustained contractions occur frequently, usually every 2 to 3 minutes, providing the necessary force for the baby's descent and birth.

Option A: A duration of 20-30 seconds is too short for the second stage of labor. This pattern is typical of the early (latent) phase of the first stage, where contractions are just beginning to establish a rhythm.
Option C: Contractions lasting 100-120 seconds are abnormally long and are considered tetanic contractions. This is a dangerous condition as it reduces the resting time between contractions, which can impair blood flow to the placenta and lead to fetal hypoxia.
Option D: This option is incorrect because a correct range is provided in the options. The duration of 45-90 seconds accurately describes the contractions of the second stage of labor.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The question tests the knowledge of the characteristics of uterine contractions during the different stages of labor, specifically the duration of contractions in the second stage as background academic context rather than a clinical decision trigger.
A nurse's primary role during labor is to monitor the mother and fetus, which includes assessing uterine contractions for frequency, duration, and intensity.
Accurate assessment helps the nurse determine the progress of labor and identify any deviations from the normal pattern.
Recognizing abnormally long contractions (tetanic, >90 seconds) or insufficient rest periods is critical for patient safety. Such patterns can lead to fetal distress and require prompt intervention, such as discontinuing oxytocin and notifying the provider.

How to Approach the Question

First, identify the key terms in the question: 'second stage of labor' and 'how long do contractions last'.
Recall the physiological characteristics of each stage of labor. Remember that contractions become progressively stronger, longer, and more frequent as labor advances.
Focus on the specific parameters for the second stage. This is the 'pushing' stage, requiring the most powerful contractions.
Evaluate the given options against the known normal values. The latent first stage has short contractions (around 30-45s). The active first stage has longer ones (45-60s). The second stage has the longest and strongest normal contractions (45-90s).
Eliminate options that are clearly incorrect. 20-30 seconds is too short (early labor). 100-120 seconds is too long and indicates a dangerous condition (tetanic contraction).
Select the option that best matches the standard duration for second-stage contractions, which is 45-90 seconds.

Concept Tested & Keywords

Concept Tested: The question tests the knowledge of the characteristics of uterine contractions during the different stages of labor, specifically the duration of contractions in the second stage.
Stem keywords: contractions, second stage of labor, interval, last
Lead-in keywords: How long
Clinical cues: Interval of 3-5 minutes of rest

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E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 40-48

E6 Obstetrics Williams p. 22-41