What is the most likely cause for variable fetal heart rate (FHR) decelerations?
Fetal hypoxemia.
Altered fetal cerebral blood flow.
Uteroplacental insufficiency.
Umbilical cord compression.
The Correct Answer is D
Choice A rationale
Fetal hypoxemia, a deficiency in oxygen reaching the fetal tissues, typically manifests as late decelerations in the fetal heart rate tracing, which reflect uteroplacental insufficiency. While severe hypoxemia can lead to various FHR patterns, variable decelerations are more directly associated with mechanical factors affecting the umbilical cord.
Choice B rationale
Altered fetal cerebral blood flow can be a consequence of various factors, including hypoxemia and cord compression, and can influence the fetal heart rate. However, variable decelerations are specifically caused by events that directly impede blood flow through the umbilical vessels rather than a generalized alteration in cerebral circulation.
Choice C rationale
Uteroplacental insufficiency, a condition where the placenta is unable to deliver an adequate supply of oxygen and nutrients to the fetus, typically results in late decelerations, indicating fetal distress due to chronic hypoxia. Variable decelerations, in contrast, have a more abrupt onset and recovery, reflecting acute changes in umbilical cord blood flow.
Choice D rationale
Umbilical cord compression occurs when the umbilical cord, which carries oxygen and nutrients to the fetus, is squeezed or constricted. This compression leads to a transient decrease in fetal blood flow and oxygenation, resulting in a rapid drop and subsequent return of the fetal heart rate, which is characteristic of variable decelerations. The shape, timing, and abrupt nature of variable decelerations directly correlate with the intermittent pressure on the umbilical cord.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","C"]
Explanation
Choice A rationale: Primigravida
Primigravida (first-time pregnancy) is a known risk factor for preeclampsia. Studies show that nulliparous individuals (those who have never given birth before) have a higher likelihood of developing preeclampsia compared to multiparous individuals. The exact reason is not fully understood, but it is thought that immunological adaptation plays a role.
Choice B rationale: Age
Advanced maternal age (≥35 years) is a recognized risk factor for preeclampsia. This client is 36 years old, which places her in the higher-risk category. Older maternal age is associated with increased vascular dysfunction and underlying chronic conditions that predispose individuals to preeclampsia.
Choice C rationale: Type 1 diabetes mellitus
Type 1 diabetes mellitus significantly increases the risk of preeclampsia due to its impact on vascular health. Diabetes affects endothelial function and can cause chronic inflammation, both of which contribute to hypertension and proteinuria, hallmark symptoms of preeclampsia. Additionally, diabetes increases the risk of abnormal placentation, further raising the chances of hypertensive disorders in pregnancy.
Choice D rationale: Hemoglobin level
A hemoglobin level of 12.5 g/dL is within the normal range and does not contribute to an increased risk for preeclampsia. While anemia is sometimes associated with preeclampsia, a normal hemoglobin level does not raise concern in this case. Therefore, hemoglobin is not a risk factor for preeclampsia in this patient.
Correct Answer is C
Explanation
Choice A rationale
Encouraging a hands-and-knees position can help rotate a fetus in an occiput posterior position or relieve back pain during labor. However, in hypotonic uterine dysfunction where contractions are weak and ineffective, this positional change alone is unlikely to augment labor significantly.
Choice B rationale
Providing a comfortable environment with dim lighting can reduce anxiety and promote relaxation, which might indirectly support labor progress. However, it does not directly address the issue of weak and ineffective uterine contractions characteristic of hypotonic dysfunction.
Choice C rationale
Administering oxytocin is the typical intervention for hypotonic uterine dysfunction after ruling out fetopelvic disproportion. Oxytocin is a synthetic hormone that stimulates uterine contractions, increasing their frequency, duration, and intensity to facilitate labor progress. It acts on the oxytocin receptors in the uterus, leading to smooth muscle contraction.
Choice D rationale
Preparing for an amniotomy (artificial rupture of membranes) might be considered to augment labor if the membranes are intact. However, since the woman's membranes have already ruptured, this intervention is not applicable in this situation. Amniotomy can sometimes stimulate or augment labor by releasing prostaglandins.
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