Share This Link

This statement is clinically inaccurate because surgical procedures involving the cervix are documented risk factors for obstetric complications. The removal of tissue can cause cervical scarring or shortening, which significantly increases the likelihood of preterm labor during gestation.

This assertion is false because the anatomical changes resulting from a cone biopsy are permanent regardless of when the procedure occurred. The resulting cervical incompetence persists as a long-term structural deficit that elevates the risk of spontaneous abortion or preterm birth.

This claim is incorrect because the primary obstetric risk associated with cervical excisional procedures is related to structural weakness rather than vascularity. While hemorrhage is a surgical risk, the long-term sequelae involve cervical shortening and an increased risk of preterm delivery rather than postpartum bleeding.

Maternal hypothermia is not a diagnostic criterion for chorioamnionitis, as the condition typically induces a febrile response. Furthermore, uterine relaxation is clinically inconsistent with the uterine irritability and tenderness commonly observed during an active intra-amniotic infection process.

Maternal hypertension is not associated with chorioamnionitis and may suggest preeclampsia. Fetal bradycardia is a late, ominous sign of fetal hypoxia rather than an early indicator, and painless contractions are characteristic of Braxton Hicks rather than infectious labor.

Maternal hypoglycemia is not a clinical feature of chorioamnionitis. While cervical shortening is a component of preterm labor, it is not part of the specific diagnostic triad used to identify this inflammatory condition of the amniotic membranes.

This statement is accurate regarding the pathophysiology of preterm labor. Decidual hemorrhage involves the disruption of the maternal-fetal interface, which triggers the coagulation cascade and the subsequent release of thrombin at the site of the decidual-placental interface.

This statement is accurate because thrombin functions as a potent uterotonic agent. It binds to protease-activated receptors on myometrial cells, increasing intracellular calcium levels and promoting myometrial contractility, which contributes to the initiation of labor contractions.

This statement is accurate because the activation of the coagulation cascade and the release of thrombin directly stimulate the uterine muscle. This biochemical pathway serves as a recognized mechanism by which decidual bleeding can precipitate the onset of preterm labor.

Multifetal gestations are associated with significantly elevated levels of corticotropin-releasing hormone. This placental hormone stimulates the production of fetal cortisol, which promotes the maturation of the fetal lung and triggers a positive feedback loop that increases myometrial sensitivity to uterotonics.

Increased placental mass in twin pregnancies leads to a higher production of prostaglandins. These lipid compounds are essential for cervical ripening and the initiation of uterine contractions, meaning that prostaglandin synthesis is actually upregulated rather than reduced in cases of multifetal gestation.

Pregnancy is a hypercoagulable state characterized by increased levels of clotting factors. Thrombin production is typically elevated, not decreased, and it acts as a potent stimulant for uterine contractions by activating protease-activated receptors on the myometrium, contributing to the pathophysiology of preterm labor.

Complete closure of the internal and external os describes a normal, competent cervix during the second trimester. This state is characterized by a closed internal os and a length typically > 25 mm, which contradicts the presence of pathological funneling.

Thickening of the cervical stroma is the opposite of the effacement process observed in cervical insufficiency. In this clinical scenario, the cervical length is decreasing rather than increasing, indicating a loss of structural integrity and collagen cross-linking within the cervix.

Absence of cervical change implies a stable, non-dilated cervix that maintains its normal length. Funneling is a dynamic, abnormal process that signifies active cervical shortening and a high risk for preterm delivery before the third trimester.

Fetal fibronectin is not a marker for pulmonary maturity, which is assessed via the lecithin-to-sphingomyelin ratio or phosphatidylglycerol levels. Corticosteroids are indicated for fetal lung maturation when preterm birth is imminent, but this specific protein does not reflect alveolar development.

While inflammation can lead to the release of fetal fibronectin, the test itself is not diagnostic for intra-amniotic infection. Chorioamnionitis is typically confirmed through clinical criteria, amniotic fluid analysis, or histopathological examination of the placenta rather than this specific biochemical marker alone.

Detection of fetal fibronectin in the cervicovaginal fluid during the second or early third trimester is considered an abnormal finding. It is associated with a higher predictive value for preterm delivery, meaning it does not represent normal placental function or a lack of risk.