During the delivery, the perineal tear extends through the sphincter of the rectum but the rectal mucosa is intact. How would you classify this type of perineal tear?

1. A

   First-degree

2. B

   Second-degree

3. C

   Third-degree

4. D

   Fourth degree

Appeared in: BHU NO - 2015

Explanation

• A third-degree perineal tear is defined as an injury to the perineum that involves the anal sphincter complex (external and/or internal).
• The scenario describes a tear extending through the rectal sphincter while the rectal mucosa remains intact, which is the precise definition of a third-degree tear.
• This classification distinguishes it from a second-degree tear (which spares the sphincter) and a fourth-degree tear (which involves the rectal mucosa).

Why Other Options Were Wrong

• Option A: A first-degree tear is a superficial injury involving only the perineal skin and/or vaginal mucosa. It does not involve muscles or the anal sphincter.
• Option B: A second-degree tear involves the perineal muscles but specifically spares the anal sphincter complex. The question states the sphincter is torn.
• Option D: A fourth-degree tear is the most severe, extending through the anal sphincter complex and into the rectal mucosa. The question explicitly states the rectal mucosa is intact.

Related Visual

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of perineal tears following vaginal delivery as background academic context rather than a clinical decision trigger.
• Accurate classification of perineal tears is critical for guiding appropriate surgical repair and preventing severe long-term morbidity. Third and fourth-degree tears (OASIS) require meticulous repair by a skilled provider to restore anatomy and function.
• Nurses play a vital role in the post-repair management, including pain control, infection prevention, bowel management with stool softeners, and patient education on perineal hygiene to promote healing and prevent complications.
• What if the rectal mucosa was NOT intact? If the tear had extended through the rectal mucosa, it would be classified as a fourth-degree tear. This requires a more complex, multi-layered repair of the rectal mucosa, internal anal sphincter, and external anal sphincter to prevent a rectovaginal fistula, a devastating complication.

How to Approach the Question

• This is a clinical classification question that requires precise recall of medical definitions.
• First, identify the key anatomical structures mentioned in the scenario: the 'sphincter of the rectum' and the 'rectal mucosa'.
• Next, note the status of each structure: the sphincter is torn, but the mucosa is 'intact'.
• Recall the definitions for the four degrees of perineal tears, focusing on the involvement of the anal sphincter and rectal mucosa.
• Match the clinical findings to the correct definition. A tear involving the sphincter with an intact mucosa corresponds to a third-degree tear.
• Systematically eliminate the other options. First and second-degree tears do not involve the sphincter. A fourth-degree tear involves a torn mucosa.

Concept Tested & Keywords

• Concept Tested: Classification of perineal tears following vaginal delivery.
• Stem keywords: delivery, perineal tear, sphincter of the rectum, rectal mucosa, intact
• Lead-in keywords: classify
• Clinical cues: The key differentiating factor is the involvement of the anal sphincter without rupture of the rectal mucosa.
• Negative lead-in flag: false

Question ID

QhCh61PbWCSmHar9zN8DWy

Copy ID

Reference Book

E6 Obstetrics Williams p. 15-30

E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 3-8