Following a spontaneous vaginal delivery, the obstetrician examines the perineum to assess the extent of tissue injury and determine the appropriate surgical repair. Match the following degrees of obstetric perineal lacerations with the correct anatomical structures involved.
- First-degree lacerationInvolves the vaginal mucosa and perineal skin without underlying muscle involvement.
- Second-degree lacerationExtends into the perineal body and deep perineal muscles, but leaves the anal sphincter intact.
- Third-degree lacerationExtends through the perineal body and involves the external and/or internal anal sphincter.
- Fourth-degree lacerationExtends through the anal sphincter complex and involves the rectal mucosa.
Cevap
First-degree matches to skin and mucosa involvement only; Second-degree matches to perineal muscle involvement sparing the sphincter; Third-degree matches to anal sphincter involvement; Fourth-degree matches to rectal mucosa involvement.
The classification of perineal lacerations is strictly based on anatomical depth. First-degree is superficial (skin/mucosa). Second-degree progresses into perineal muscles. Third-degree involves the anal sphincter. Fourth-degree extends entirely through the sphincter into the rectal mucosa.
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Anahtar Kavram
Anatomical classification of obstetric perineal lacerations