Included in the definition of tachysystole is:
Contraction duration of less than 40 seconds.
Contraction frequency of greater than 5 in 10 minutes.
Contraction intensity of less than 80 mm Hg.
Resting tone of less than 18 mm Hg.
The Correct Answer is B
Choice A rationale
Contraction duration less than 40 seconds doesn't define tachysystole. Tachysystole focuses on frequency, not duration, of contractions over a specific time frame.
Choice B rationale
Contraction frequency of more than 5 in 10 minutes defines tachysystole. This frequency indicates excessive uterine activity, requiring intervention to prevent fetal distress.
Choice C rationale
Contraction intensity less than 80 mm Hg does not define tachysystole. Intensity relates to contraction strength, but tachysystole is about frequency exceeding the normal range.
Choice D rationale
Resting tone less than 18 mm Hg isn't part of tachysystole's definition. Tachysystole pertains to contraction frequency, not resting tone, which measures uterine relaxation between contractions.
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Correct Answer is D
Explanation
Choice A rationale
Oxytocin is used to induce or augment labor, not typically used before an external version, which is a procedure to turn a breech baby to a head-down position.
Choice B rationale
Methylergonovine is used to prevent or control postpartum hemorrhage by inducing strong uterine contractions, not indicated before an external version.
Choice C rationale
Betamethasone is a corticosteroid used to accelerate fetal lung maturity in preterm labor, not required for an external version.
Choice D rationale
Terbutaline is a tocolytic agent used to relax the uterus, making it easier to manipulate the fetus during the external version procedure.
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.