Which of the following does not cause the subinvolution of the uterus ?

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2023

Obstetrics & Gynaecology

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2023

Explanation

A complete perineal tear is a laceration of the skin and other soft tissue structures which, at their deepest, separate the vagina from the anus.
This injury is anatomically distinct and separate from the uterus, which is located superiorly within the pelvic cavity.
Because it does not involve the uterine muscle (myometrium) or lining (endometrium), a perineal tear does not interfere with the physiological process of uterine contraction and shrinkage (involution) after delivery.

Option A: Retained placental fragments are a primary cause of subinvolution. The remaining tissue acts as a foreign body, physically preventing the uterus from contracting fully and closing off blood vessels.
Option B: Pelvic infection, particularly endometritis (infection of the uterine lining), causes inflammation that directly impairs myometrial contraction and the overall healing process, leading to subinvolution.
Option C: Anemia is a systemic maternal factor that contributes to subinvolution. Poor oxygen-carrying capacity and general weakness can lead to poor uterine muscle tone (atony), impairing its ability to contract effectively.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Etiology of uterine subinvolution as background academic context rather than a clinical decision trigger.
Nurses play a critical role in identifying subinvolution by regularly assessing the fundal height, uterine tone (firm vs. boggy), and the amount, color, and odor of lochia during the postpartum period.
A uterus that is larger than expected, feels soft or 'boggy' on palpation, or is associated with prolonged or excessive bleeding (lochia rubra lasting beyond the first week) are key signs that must be reported promptly.
What if? If a patient has a firm uterus but continues to have a slow, steady trickle of bright red blood, the nurse should suspect a cervical or vaginal laceration rather than uterine atony, and a thorough examination by a provider is warranted.

How to Approach the Question

First, identify the core concept of the question, which is 'subinvolution of the uterus'.
Recognize the negative framing: 'does not cause'. This means you are looking for the option that is NOT a cause of subinvolution, while the other three are valid causes.
Define subinvolution: the failure of the uterus to return to its normal, non-pregnant size after delivery. This is a process involving the uterus itself.
Evaluate each option in relation to the uterus:
A) Retained placental fragments: These are inside the uterus and would logically interfere with its function.
B) Pelvic infection: This often involves the uterus (endometritis) and would impair its function.

Concept Tested & Keywords

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E6 Obstetrics Williams p. 45-64