A nurse is orienting a newly licensed nurse on the purpose of administering Vecuronium to a client who has acute respiratory distress syndrome (ARDS). Which of the following statements by the newly licensed nurse indicates an understanding of the teaching?
This medication is given to reduce anxiety.
This medication is given to facilitate ventilation.
This medication is given to decrease inflammation.
This medication is given to treat infection.
The Correct Answer is B
Choice A rationale
Vecuronium is a neuromuscular blocking agent, not an anxiolytic. Its primary mechanism of action involves competitive antagonism of acetylcholine at the nicotinic receptors on the motor endplate, leading to muscle paralysis. It does not possess anxiolytic properties, and administering it without concurrent sedation would cause significant distress to a conscious patient who is paralyzed but fully aware.
Choice B rationale
Vecuronium facilitates ventilation by inducing skeletal muscle paralysis, thereby preventing spontaneous breathing and patient-ventilator asynchrony. This allows for precise control of ventilation parameters in critically ill patients, reducing oxygen consumption by respiratory muscles and improving gas exchange. This paralysis is crucial in conditions like ARDS where high airway pressures and controlled ventilation are often required.
Choice C rationale
Vecuronium does not directly decrease inflammation. Its action is specific to the neuromuscular junction, leading to muscle relaxation and paralysis. While mechanical ventilation facilitated by vecuronium can indirectly reduce lung injury by optimizing ventilation, it does not have intrinsic anti-inflammatory properties at a molecular or cellular level. Anti-inflammatory medications would be administered separately if indicated.
Choice D rationale
Vecuronium is not an antimicrobial agent and has no direct activity against infectious pathogens. Its therapeutic role is limited to inducing muscle paralysis for medical procedures or to facilitate mechanical ventilation. Treating infection requires specific antibiotics or antiviral medications. Administering vecuronium would not address the underlying infectious process in a patient with ARDS.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Metabolic acidosis is characterized by a primary reduction in serum bicarbonate, typically below 22 mmol/L, which drives the pH below the normal range of 7.35. While compensation mechanisms would involve a decrease in PaCO2, the provided arterial blood gas values demonstrate an elevated pH and elevated bicarbonate, which are inconsistent with metabolic acidosis.
Choice B rationale
Respiratory acidosis is primarily defined by an increase in arterial carbon dioxide (PaCO2), above the normal range of 45 mm Hg, leading to a decrease in blood pH below 7.35. Compensation would involve an increase in bicarbonate. The given values, particularly the elevated pH and normal PaCO2, do not align with the characteristics of respiratory acidosis.
Choice C rationale
Respiratory alkalosis is characterized by a primary decrease in PaCO2, below the normal range of 35 mm Hg, leading to an elevated pH above 7.45. Uncompensated means the bicarbonate level remains within the normal range of 22-26 mmol/L. The provided PaCO2 is within normal limits, and bicarbonate is elevated, which contradicts the criteria for respiratory alkalosis.
Choice D rationale
Metabolic alkalosis is characterized by a primary increase in serum bicarbonate (HCO3), typically above the normal range of 26 mmol/L, which results in an elevated blood pH above 7.45. Uncompensated metabolic alkalosis indicates that the PaCO2 remains within its normal range (35-45 mm Hg) as the respiratory system has not yet initiated or completed compensatory hypoventilation. The provided pH of 7.5, PaCO2 of 40 mm Hg, and HCO3 of 34 mmol/L precisely fit this definition.
Correct Answer is D
Explanation
Choice A rationale
Cyanosis, a bluish discoloration of the skin and mucous membranes, is a late and ominous sign of hypoxia. It becomes clinically apparent when there are approximately 5 grams per deciliter of desaturated hemoglobin. This indicates a significant reduction in oxygen saturation and severe tissue hypoxia, representing a decompensated physiological state.
Choice B rationale
Bradycardia, a slower than normal heart rate (normal range 60-100 beats per minute for adults), is typically a late sign of hypoxia, particularly in adults. Initially, the body often compensates for hypoxia with tachycardia to increase cardiac output and oxygen delivery. Profound and prolonged hypoxia can depress myocardial function, leading to bradycardia.
Choice C rationale
Hypotension, a low blood pressure (normal range systolic 90-120 mmHg, diastolic 60-80 mmHg), is generally considered a late sign of hypoxia. In the early stages, the sympathetic nervous system may initially increase blood pressure as a compensatory mechanism. However, prolonged or severe hypoxia can lead to myocardial depression and vasodilation, resulting in hypotension.
Choice D rationale
Agitation is an early neurological sign of hypoxia. As oxygen levels decrease, cerebral hypoxia affects brain function, leading to irritability, restlessness, and confusion. The brain is highly sensitive to oxygen deprivation, and these behavioral changes are often among the first indicators of inadequate oxygenation, preceding more overt physiological decompensation.
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