At her first prenatal visit, a woman and the nurse are discussing fetal development.The client asks, "When will we be able to hear the baby's heartbeat?" The nurse should reply, The fetal heartbeat can be heard with a Doppler at:
The fourth week of gestation.
The sixth week of gestation.
The seventh week of gestation.
The twelfth week of gestation.
The Correct Answer is D
Choice A rationale
The fetal heartbeat can be heard with a Doppler at the fourth week of gestation is incorrect. At this early stage, the embryonic heart has only just begun to form, and its activity cannot be detected by Doppler.
Choice B rationale
The fetal heartbeat can be heard with a Doppler at the sixth week of gestation is incorrect. Although the heart begins to beat around this time, it is usually too faint to be detected by Doppler.
Choice C rationale
The fetal heartbeat can be heard with a Doppler at the seventh week of gestation is incorrect. It remains challenging to detect the fetal heartbeat this early with standard Doppler equipment.
Choice D rationale
The fetal heartbeat can be heard with a Doppler at the twelfth week of gestation is correct. By the end of the first trimester, the fetal heart is sufficiently developed and strong enough to be detected using Doppler ultrasound, allowing healthcare providers to monitor fetal well-being.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Rh(D) immunoglobulin prevents the formation of Rh antibodies in Rh-negative mothers. This is crucial to prevent Rh sensitization, which can lead to hemolytic disease of the newborn in current and future pregnancies.
Choice B rationale
Rh(D) immunoglobulin does not prevent the formation of Rh antibodies in newborns who are Rh positive. Instead, it works by preventing the mother's immune system from recognizing Rh-positive fetal cells.
Choice C rationale
Rh(D) immunoglobulin does not destroy Rh antibodies in Rh-negative mothers. Its purpose is to prevent the formation of these antibodies in the first place.
Choice D rationale
Rh(D) immunoglobulin does not destroy Rh antibodies in newborns who are Rh positive. The newborn's immune system is not targeted by this immunoglobulin.
Correct Answer is ["3.9"]
Explanation
Step 1 is 3900 grams ÷ 1000 = 3.9 kg
Step 2 is 25 mg/kg × 3.9 kg = 97.5 mg
Step 3 is 97.5 mg ÷ (125 mg/5 mL) = 3.9 mL
The newborn will receive 3.9 mL in 24 hours.
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