An obstetric laceration involving the rectal sphincter but not the rectal mucosa is classified as what degree?

A laceration involving the rectal sphincter but not affecting the rectal mucosa is classified as a third-degree laceration. In obstetric terminology, the classification of perineal lacerations is based on the extent of the injury.

First-degree lacerations are superficial, involving only the vaginal mucosa and perineal skin. Second-degree lacerations extend deeper, involving the vaginal muscles and the perineal muscles but not reaching the anal sphincter.

A third-degree laceration is more severe and specifically involves the anal sphincter, indicating that the injury has penetrated this layer, while the rectal mucosa remains intact. This type of laceration can have more significant implications for recovery and may require surgical repair.

Fourth-degree lacerations go even further, involving not only the anal sphincter but also the rectal mucosa.

Understanding these classifications assists healthcare providers in providing appropriate care and counseling regarding recovery and potential complications.