North American Registry of Midwives (NARM) Practice Exam

A sulcus tear is classified as which degree of laceration?

1. First degree

2. Second degree

3. Third degree

4. Fourth degree

The correct answer is: First degree

In obstetric terminology, a sulcus tear specifically refers to a laceration that occurs in the vaginal wall or perineum but does not involve the underlying muscles. This type of tearing typically only affects the skin and mucosa, which is why it is classified as a first-degree laceration. First-degree lacerations are the least severe, involving only the superficial layers of tissue. This contrasts with second-degree lacerations, which extend through the vaginal muscle and into the perineal muscles, while third and fourth degree lacerations involve more extensive damage to the pelvic structures, including the anal sphincter and rectal mucosa. Therefore, understanding the definitions and implications of each degree of laceration helps accurately classify and manage perineal injuries during childbirth.