When should pushing begin during labor?

Antenatal corticosteroids, such as betamethasone or dexamethasone, are administered to women at risk of preterm birth to stimulate surfactant synthesis. These steroids induce the maturation of type 2 pneumocytes within the fetal lungs. This pharmacological intervention significantly reduces the incidence of respiratory distress syndrome.

A. Prevent seizures: Magnesium sulfate is the agent of choice for seizure prophylaxis in preeclampsia. Corticosteroids have no anticonvulsant properties and do not alter the cerebral irritability caused by hypertension. They are strictly focused on fetal organ maturation.

B. Increase maternal BP: Corticosteroids can occasionally cause a transient increase in blood pressure or blood glucose, which is an undesired side effect in preeclampsia. The clinical goal is never to raise the arterial pressure further. Careful monitoring of maternal hemodynamics is required post-administration.

C. Enhance fetal lung maturity: The primary indication is to prepare the fetus for potential early delivery necessitated by severe preeclampsia. Steroids decrease the risk of intraventricular hemorrhage and necrotizing enterocolitis in the neonate. They provide a critical survival advantage for preterm infants.

D. Reduce contractions: Corticosteroids do not possess tocolytic properties and cannot halt the labor process. While they are often given alongside tocolytics, their role is purely developmental. They do not interact with myometrial receptors to inhibit uterine activity or contractions.

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.