Tocolytic drugs are used in preterm labor to:
Protect the fetus from infection.
Tie the cervix closed.
Allow time to give antenatal corticosteroids.
Prevent rupture of the membranes.
The Correct Answer is C
Choice A rationale
Tocolytic drugs, such as beta-adrenergic agonists (e.g., terbutaline) or magnesium sulfate, work by inhibiting uterine contractions. They do not possess any antimicrobial properties or mechanisms to protect the fetus from infection. Prophylactic antibiotics, not tocolytics, are administered to prevent or treat infections, especially in cases of prolonged rupture of membranes. The primary action is solely on smooth muscle relaxation, not immune response.
Choice B rationale
Tocolytic drugs function as uterine relaxants, suppressing uterine muscle contractions to delay preterm birth. Tying the cervix closed, a procedure known as a cerclage, is a surgical intervention used to prevent miscarriage or preterm birth in women with cervical insufficiency. This is a structural solution, completely different from the pharmacological mechanism of tocolytics which acts on smooth muscle cells.
Choice C rationale
Tocolytic medications delay labor, providing a crucial window to administer antenatal corticosteroids like betamethasone or dexamethasone. These corticosteroids require 24 to 48 hours to be effective, crossing the placenta to accelerate fetal lung maturity by stimulating surfactant production. This reduces the risk of respiratory distress syndrome, intraventricular hemorrhage, and necrotizing enterocolitis in the preterm infant.
Choice D rationale
Tocolytic drugs do not prevent the rupture of membranes. The rupture of membranes, known as amniorrhexis, is a physical event caused by the breakdown of the amniotic sac. Tocolytics act on the uterine muscle to inhibit contractions, which is a different physiological process. They can sometimes be used after membranes have ruptured to delay delivery, but they don't prevent the rupture itself.
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Related Questions
Correct Answer is B
Explanation
Choice A rationale
True labor contractions are characterized by their persistence and increasing intensity, unlike Braxton Hicks or false labor contractions which often subside with ambulation or a change in activity. This is due to the sustained release of oxytocin and prostaglandins, which stimulate continuous uterine muscle activity, leading to cervical change.
Choice B rationale
A key differentiator of true labor contractions is that they do not diminish with comfort measures like relaxation or taking a shower. These contractions are caused by physiological changes at the myometrial cellular level that are not easily influenced by external stimuli, and their progressive nature is essential for cervical effacement and dilation.
Choice C rationale
True labor contractions follow a predictable pattern, becoming regular in frequency, duration, and intensity over time. This is in contrast to false labor contractions, which remain irregular. The increasing regularity is a result of the synchronized rhythmic firing of myometrial cells as the labor process advances.
Choice D rationale
True labor contractions typically originate in the back and radiate to the lower abdomen, often described as a cramping or tightening sensation that encompasses the entire uterus. Discomfort localized only to the top of the uterus is more characteristic of Braxton Hicks contractions, which do not contribute to cervical change.
Correct Answer is C
Explanation
Choice A rationale
While a baby’s head facing the wrong direction, such as an occiput posterior position, can cause back labor pain, it typically manifests as intense back pain, not just lower abdominal and perineal pain. The intense pain in the lower abdomen and perineal area is characteristic of the baby's head descending and applying pressure on the pelvic floor and surrounding tissues.
Choice B rationale
The first stage of labor is characterized by cervical changes (dilation and effacement) with pain typically felt in the uterine fundus and radiating to the lower back and abdomen. Intense pain specifically in the lower abdomen and perineal area, as described, suggests significant fetal head descent, which is more characteristic of the second stage of labor.
Choice C rationale
The second stage of labor begins when the cervix is fully dilated and ends with the birth of the baby. During this stage, the fetus's head descends into the pelvis, causing intense pressure and pain in the lower abdomen and perineal area as it presses on the pelvic floor, nerves, and surrounding structures. The patient's pain description strongly aligns with this process.
Choice D rationale
While fetal distress can cause changes in fetal heart rate and may be a concern during labor, it is not directly associated with the specific location of the patient's pain. Fetal distress is primarily a fetal issue, and its signs are seen in fetal monitoring, such as late decelerations or a non-reassuring fetal heart rate pattern, rather than in the specific location of the mother's pain.
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