The most common cause of decreased variability in the fetal heart rate (FHR) that lasts 30 minutes or less is:

fetal sleep cycles.

umbilical cord compression.

altered cerebral blood flow.

fetal hypoxemia.

Answer and Explanation

The Correct Answer is A

Choice A reason: Fetal sleep cycles are a normal physiological cause of decreased variability in the FHR, which is the fluctuation of the baseline FHR above and below 2 cycles per minute. Fetal sleep cycles usually last 20 to 40 minutes and do not affect the fetal well-being.

Choice B reason: Umbilical cord compression is an abnormal cause of decreased variability in the FHR, as it reduces the blood flow and oxygen delivery to the fetus. It can also cause variable decelerations, which are abrupt decreases in the FHR below the baseline.

Choice C reason: Altered cerebral blood flow is an abnormal cause of decreased variability in the FHR, as it indicates a compromise in the fetal central nervous system. It can also cause late decelerations, which are gradual decreases in the FHR after the peak of a contraction.

Choice D reason: Fetal hypoxemia is an abnormal cause of decreased variability in the FHR, as it reflects a severe lack of oxygen in the fetal blood. It can also cause sinusoidal pattern, which is a smooth, undulating waveform in the FHR.

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Correct Answer is B

Explanation

Choice A reason: Human immunodeficiency virus (HIV) is a viral sexually transmitted infection that causes acquired immunodeficiency syndrome (AIDS). It is characterized by a progressive decline of the immune system, leading to opportunistic infections and cancers. It does not have recurrent episodes, but rather a chronic and incurable course.

Choice B reason: Herpes simplex virus (HSV)-2 is a viral sexually transmitted infection that causes genital herpes. It is characterized by a primary infection followed by recurrent episodes of painful blisters and ulcers in the genital area. The virus remains latent in the nerve cells and can reactivate periodically or in response to triggers such as stress, illness, or menstruation.

Choice C reason: Human papillomavirus (HPV) is a viral sexually transmitted infection that causes genital warts and cervical cancer. It is characterized by a persistent infection that may or may not produce symptoms. It does not have recurrent episodes, but rather a variable and unpredictable course.

Choice D reason: Cytomegalovirus (CMV) is a viral sexually transmitted infection that causes mild or asymptomatic infections in healthy adults. It is characterized by a latent infection that can reactivate in immunocompromised individuals, causing serious complications such as retinitis, pneumonia, or encephalitis. It does not have recurrent episodes, but rather a dormant and opportunistic course.

A. a daily consumption of alcohol indicates a risk for alcoholism. B. she will be at risk for abusing other substances as well. C. the fetus is at risk for multiple organ anomalies. D. the fetus is placed at risk for altered brain growth.

Correct Answer is D

Explanation

Choice A reason: A daily consumption of alcohol does not necessarily indicate a risk for alcoholism, although it is not recommended for pregnant women. Alcoholism is a chronic disease that involves physical and psychological dependence on alcohol, and it requires more than one criterion to be diagnosed.

Choice B reason: She will not be at risk for abusing other substances as well, unless she has a history or predisposition for substance abuse. Alcohol use during pregnancy does not cause other substance abuse problems, although it may co-occur with them.

Choice C reason: The fetus is not at risk for multiple organ anomalies, unless the mother consumes large amounts of alcohol during the first trimester of pregnancy. This can cause fetal alcohol syndrome (FAS), which is characterized by facial dysmorphia, growth retardation, and intellectual disability. However, FAS is rare and not related to moderate alcohol intake during the second trimester.

Choice D reason: The fetus is placed at risk for altered brain growth, as alcohol can cross the placenta and affect the developing nervous system of the fetus. Alcohol exposure during the second trimester can impair the formation and migration of neurons, leading to reduced brain size and function. This can result in learning difficulties, behavioral problems, and cognitive impairments in the child.

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The most common cause of decreased variability in the fetal heart rate (FHR) that lasts 30 minutes or less is:

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Correct Answer is B

Explanation

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Correct Answer is D

Explanation

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