Oxytocin has half-life of

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024

Explanation

Authoritative obstetrical texts state that the plasma half-life of oxytocin is approximately 3 to 5 minutes.
This short half-life is a crucial safety feature, allowing for rapid cessation of its effects if adverse events occur.
Due to this property, oxytocin is administered via continuous IV infusion to maintain steady-state plasma concentrations and allow for precise control of uterine contractions.
The option of 3-4 minutes falls squarely within the clinically accepted range of 3-5 minutes.

Option A: This range is slightly lower than the commonly cited half-life of 3 to 5 minutes. While close, it is less accurate.
Option C: This range represents the upper end of the accepted 3-5 minute half-life. While plausible, 3-4 minutes is also a correct part of the range and often cited.
Option D: This range is outside the accepted half-life of 3 to 5 minutes for oxytocin during labor.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacokinetics of Oxytocin as background academic context rather than a clinical decision trigger.
Understanding oxytocin's short half-life is critical for safe nursing practice in labor and delivery.
It explains why stopping the infusion is the first and most effective intervention for uterine tachysystole or a non-reassuring fetal heart rate pattern.
This knowledge reinforces the need for continuous maternal and fetal monitoring during oxytocin administration to promptly identify and manage complications.

How to Approach the Question

This is a factual recall question testing your knowledge of pharmacology.
Identify the core of the question: the half-life of oxytocin.
Recall the pharmacokinetic properties of oxytocin, specifically its duration of action in the context of labor and delivery.
Remember that oxytocin is designed to have a very short half-life for safety reasons, allowing for quick reversal of its effects.
Evaluate the given options against the known range. The accepted half-life is approximately 3-5 minutes.
Select the option that best fits within this range. Both 3-4 min and 4-5 min are within the range, but 3-4 min is a common and accurate representation.

Concept Tested & Keywords

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E6 Obstetrics Williams pp. 83-95, 11-26

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