A client in labor and delivery has just received a dose of ephedrine.
Which of the following signs should the nurse expect to see?
An increase in temperature.
A decrease in blood pressure.
An increase in the blood pressure.
A decrease in respiratory rate.
The Correct Answer is C
Choice A rationale
Ephedrine is an indirect and direct-acting sympathomimetic amine used as a vasopressor, primarily to treat maternal hypotension, especially following neuraxial anesthesia. Its primary effect is vasoconstriction and increased cardiac output, not a significant or immediate increase in body temperature.
Choice B rationale
Ephedrine acts on alpha-1 adrenergic receptors to cause vasoconstriction and on beta-1 receptors to increase heart rate and cardiac output. This combination results in an increase in systemic vascular resistance and cardiac output, which directly raises the blood pressure, making a decrease in blood pressure an unexpected and incorrect finding.
Choice C rationale
Ephedrine administration is expected to increase the blood pressure, as it acts as a vasopressor. It stimulates alpha-1 receptors, causing peripheral vasoconstriction, and beta-1 receptors, increasing heart rate and contractility, which are the therapeutic goals for treating hypotension during labor. Normal adult blood pressure is typically < 120/80 mmHg.
Choice D rationale
Ephedrine's primary cardiovascular effects are related to blood pressure and heart rate. While sympathetic stimulation can have minor effects on respiration, a significant decrease in respiratory rate is not an expected or desired primary side effect of ephedrine; it may even cause a slight increase due to overall sympathetic activation. Normal adult respiratory rate is 12-20 breaths per minute.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale
Sepsis is a generalized infection, and while any systemic infection is a relative contraindication to an epidural due to the risk of spreading the infection to the central nervous system, local site infection is the primary concern, and sepsis is not the most common or specific hematological contraindication.
Choice B rationale
Thrombocytopenia, characterized by a platelet count below the normal range of 150,000 to 450,000/microL, significantly increases the risk of epidural hematoma formation at the puncture site, which can lead to spinal cord compression and permanent neurological damage, making it a critical contraindication for epidural placement.
Choice C rationale
The extent of cervical dilation is not an absolute contraindication for an epidural, as it can be placed even in active labor (4-7 cm) or occasionally later, although the effectiveness may be reduced if placed very close to delivery; a 5 cm dilation is generally an acceptable time for placement.
Choice D rationale
Anemia, defined as a low red blood cell count or hemoglobin level (normal Hgb for pregnant women is >11 g/dL in the first and third trimesters, >10.5 g/dL in the second), does not affect the risk of hemorrhage or neurological complications associated with epidural insertion and is therefore not a specific contraindication.
Correct Answer is D
Explanation
Choice A rationale
Telling the woman to push immediately upon full dilation is often discouraged as it does not allow for a period of rest or passive descent, which is beneficial for both maternal and fetal well-being, especially if the urge to push is not yet overwhelming. Pushing should ideally be driven by the woman's involuntary urge, often called 'laboring down' or delayed pushing. This conserves maternal energy and may improve fetal oxygenation by reducing the number of sustained pushing efforts.
Choice B rationale
Sustained, closed-glottis pushing, where the woman holds her breath and pushes for 10-15 seconds, increases intrathoracic and intra-abdominal pressure. This can lead to decreased venous return to the heart, resulting in reduced maternal cardiac output and blood pressure. Consequently, this diminishes blood flow to the placenta and can cause fetal hypoxia or nonreassuring fetal heart rate patterns, making it a generally unfavorable pushing technique.
Choice C rationale
While an epidural can provide effective pain relief, it may slow the progress of the second stage of labor by reducing the woman's urge and ability to spontaneously push, especially with dense motor blockade. Furthermore, the timing of the epidural placement, particularly initiating it during the second stage, is not a primary measure to enhance fetal descent, which relies more on gravity and effective pushing efforts.
Choice D rationale
Encouraging upright positions like squatting or having the head of the bed up utilizes the force of gravity to assist fetal descent and rotation through the pelvis. These positions also promote uterine contractility and allow for optimal maternal-pelvic alignment. Squatting, in particular, increases the capacity of the pelvic outlet by 10.
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