The principal risk factor predictive of preterm birth is:
History of preterm birth.
Low prepregnancy weight.
Smoking during pregnancy.
Obesity.
The Correct Answer is A
Choice A rationale
History of preterm birth is the principal risk factor for predicting preterm birth. Previous preterm births significantly increase the likelihood of subsequent preterm deliveries due to
underlying etiological factors.
Choice B rationale
Low prepregnancy weight is a risk factor but not as significant as a history of preterm birth. It can contribute to complications in pregnancy but does not have the same predictive value.
Choice C rationale
Smoking during pregnancy increases the risk of preterm birth but is not the principal risk factor. It is a modifiable behavior that contributes to poor pregnancy outcomes.
Choice D rationale
Obesity can impact pregnancy outcomes but is not the principal risk factor for preterm birth. It is associated with other complications rather than directly predicting preterm delivery.
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Correct Answer is B
Explanation
Choice A rationale
Retained tissue can cause postpartum hemorrhage, but with a firm uterus and no other signs of retained placenta, this is less likely the cause here.
Choice B rationale
Trauma is the most likely cause of increased bleeding in this scenario. The prolonged oxytocin induction and macrosomic infant suggest a higher risk of lacerations or uterine atony
despite the firm uterus.
Choice C rationale
Thrombin disorders cause bleeding due to clotting issues. However, this patient shows signs of active bleeding and clotting, making this less likely.
Choice D rationale
Uterine atony, indicated by a soft, boggy uterus, is a common cause of postpartum hemorrhage, but in this case, the uterus is firm, so it's less likely to be the cause.
Correct Answer is C
Explanation
Choice A rationale
Prolonged labor is not directly linked to drug use and does not present as an immediate complication.
Choice B rationale
Prolapsed cord is not associated with substance abuse and lacks direct connection to this scenario.
Choice C rationale
Cocaine use heightens the risk of abruptio placentae, a serious condition where the placenta detaches prematurely.
Choice D rationale
Retained placenta is a concern but less likely than abruptio placentae in the context of cocaine use.