A client who is considering tubal ligation asks what it does. Which response is correct?

Emergency contraception aims to prevent pregnancy after unprotected coitus by delaying or inhibiting ovulation. These medications are most effective when administered within 72 to 120 hours, depending on the pharmacological agent used. They do not interrupt an established pregnancy and are not abortifacients.

A. Start birth control pills next month: Waiting until the next menstrual cycle offers no protection for the current exposure and allows for potential fertilization to occur. Standard oral contraceptives are meant for long-term prophylaxis rather than acute post-coital intervention. This advice would be ineffective in this scenario.

B. Tubal ligation: This is a permanent surgical sterilization procedure that does not provide any immediate post-coital protection. It requires an invasive operation and is not an appropriate response to a single acute exposure. It is a contraceptive choice for those desiring no future children.

C. Emergency contraception: High-dose progestin or selective progesterone receptor modulators can effectively prevent pregnancy if taken within the appropriate window. This intervention acts rapidly to prevent the release of an egg before fertilization can take place. It is the primary recommendation for recent unprotected contact.

D. Do nothing: Taking no action carries a significant risk of unplanned pregnancy if the encounter occurred near the patient's fertile window. There are safe, effective medical options available to significantly reduce this risk. Recommending no intervention ignores the patient's stated goal of prevention.

Cervical insufficiency involves the painless structural compromise of the cervix, leading to premature dilation and second-trimester pregnancy loss. It often results from previous surgical trauma or collagen disorders that weaken the cervical stroma. Management requires mechanical reinforcement to maintain uterine integrity until fetal maturity is achieved.

A. Prevent cervical dilation: A cerclage involves placing a non-absorbable purse-string suture around the cervix to provide mechanical support. This procedure compensates for the weakened tissue by physically holding the cervical canal closed under the weight of the enlarging fetus. It is a critical intervention to prevent mid-trimester miscarriage.

B. Increase fetal growth: The procedure is strictly an anatomical repair of the maternal cervix and has no direct influence on fetal metabolic processes. Fetal growth depends on placental efficiency and the transfer of maternal nutrients, which are not altered by the presence of a suture. It is not used for growth-related indications.

C. Stop contractions: Cerclage is not a tocolytic intervention and cannot pharmacologically inhibit myometrial activity. If active labor or contractions begin, the suture must be removed immediately to prevent cervical laceration or uterine rupture. Its role is passive and structural rather than active and muscular.

D. Induce labor: The primary goal of a cerclage is the exact opposite of induction, as it aims to prolong gestation and prevent early delivery. Inducing labor involves the use of oxytocin or prostaglandins to stimulate contractions. Cerclage is a preventative measure against premature cervical opening.