A patient was admitted to the intensive care unit with cardiogenic shock and a blood pressure of 78/38. Which vasopressor medication does the nurse identify as the first-line treatment for cardiogenic shock?
Dopamine
Norepinephrine
Epinephrine
Vasopressin (Pitressin)
The Correct Answer is B
Choice A rationale:
Dopamine was once considered a first-line vasopressor for cardiogenic shock. However, recent studies have shown that it is associated with increased mortality compared to norepinephrine.
Dopamine has dose-dependent effects on dopamine receptors, beta receptors, and alpha receptors. At low doses (1-5 mcg/kg/min), it primarily stimulates dopamine receptors, leading to renal vasodilation and increased urine output. At moderate doses (5-10 mcg/kg/min), it stimulates beta receptors, resulting in increased heart rate and contractility. At high doses (>10 mcg/kg/min), it stimulates alpha receptors, causing vasoconstriction.
The main concern with dopamine is its potential to cause arrhythmias, particularly at higher doses. This is due to its effects on beta receptors, which can increase heart rate and myocardial oxygen demand.
Additionally, dopamine can cause tachyphylaxis, meaning that its effects can diminish over time, requiring higher doses to achieve the same effect.
Choice B rationale:
Norepinephrine is a potent alpha-adrenergic agonist that causes vasoconstriction, leading to an increase in blood pressure. It has minimal effects on beta receptors, so it is less likely to cause tachycardia and arrhythmias compared to dopamine.
Norepinephrine also has some inotropic effects, meaning that it can increase the strength of contraction of the heart muscle.
Studies have shown that norepinephrine is associated with improved survival rates in patients with cardiogenic shock compared to dopamine.
It is generally well-tolerated, with the most common side effects being hypertension and peripheral vasoconstriction.
Choice C rationale:
Epinephrine is a potent alpha- and beta-adrenergic agonist that causes vasoconstriction, increased heart rate, and increased contractility.
It is typically used as a second-line agent in cardiogenic shock, after norepinephrine has failed to achieve adequate blood pressure.
Epinephrine can cause significant tachycardia and arrhythmias, so it should be used with caution in patients with underlying heart disease.
Choice D rationale:
Vasopressin is a hormone that causes vasoconstriction by acting on V1 receptors in vascular smooth muscle. It is sometimes used as an adjunct to norepinephrine in patients with refractory cardiogenic shock.
Vasopressin has the potential to cause coronary vasoconstriction, so it should be used with caution in patients with coronary artery disease.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","D"]
Explanation
Choice A rationale:
Seizure precautions are necessary because:
The patient has ingested multiple drugs, some of which can lower the seizure threshold, such as benzodiazepines. Naloxone, while reversing opioid overdose, can also precipitate seizures in some individuals.
Flumazenil, used to reverse benzodiazepine overdose, can also induce seizures, especially in patients with a history of epilepsy or benzodiazepine dependence.
The potential for drug interactions and unpredictable effects of multiple drug ingestion further increases the risk of seizures. Specific seizure precautions include:
Placing the patient in a bed with padded side rails. Having oxygen and suction equipment readily available.
Keeping intravenous access open for potential administration of anticonvulsant medications. Closely monitoring the patient's neurological status for any signs of seizure activity.
Choice B rationale:
Aspiration precautions are crucial due to:
The patient's unconscious state, which impairs their ability to protect their airway.
The possibility of vomiting, which can occur as a side effect of naloxone or flumazenil administration.
The potential for aspiration of gastric contents, which can lead to serious respiratory complications, such as pneumonia. Specific aspiration precautions include:
Positioning the patient on their side in the recovery position. Continuously monitoring the patient's respiratory status.
Having suction equipment ready to clear the airway if necessary.
Considering intubation and mechanical ventilation if the patient's airway is compromised.
Choice D rationale:
Fall precautions are essential because:
The patient is unconscious and may be disoriented or uncoordinated upon regaining consciousness.
The effects of the ingested drugs, as well as the medications administered, can impair balance and coordination. Falls can result in serious injuries, such as head trauma or fractures.
Specific fall precautions include:
Keeping the bed in a low position with side rails up.
Assisting the patient with ambulation when they are able to move. Ensuring the patient's environment is free of tripping hazards.
Providing close supervision and assistance as needed.
Choice C rationale:
Suicide precautions are not routinely implemented in this scenario because:
The patient's primary presentation is drug overdose, not active suicidal ideation or attempts.
The focus of care is on addressing the immediate medical complications of the overdose and stabilization.
However, a thorough suicide risk assessment should be conducted once the patient is medically stable to determine if ongoing suicide precautions are necessary.
Correct Answer is B
Explanation
Rationale for Choice A:
Repeating the dose of nitroglycerin SL is not recommended at this time due to the patient's hypotension (blood pressure of 88/68 mmHg).
Administering additional nitroglycerin could further lower the blood pressure, potentially leading to adverse consequences such as dizziness, lightheadedness, or even fainting.
It's crucial to prioritize patient safety and avoid actions that could exacerbate their condition. Rationale for Choice B:
Notifying the provider is the most appropriate action in this situation for several reasons:
The patient's chest pain has not been relieved by the initial dose of nitroglycerin, indicating a need for further evaluation and potential adjustments to the treatment plan.
The patient's blood pressure is low, which warrants close monitoring and possible intervention to prevent complications.
The provider can assess the patient's overall clinical picture, including other symptoms and medical history, to determine the best course of action.
Early notification allows for timely interventions and potential prevention of further complications. Rationale for Choice C:
While nitroglycerin by translingual spray may be considered in some cases of persistent angina, it's not the most appropriate choice in this situation due to the patient's hypotension.
The translingual spray can also have a rapid onset of action, which might further lower the blood pressure if not carefully monitored.
It's essential to consider the patient's overall hemodynamic status before administering any medication that could potentially affect blood pressure.
Rationale for Choice D:
Administering NPH insulin is not relevant to the management of angina or chest pain.
Insulin is used to treat hyperglycemia in patients with diabetes, and its administration would not address the underlying issue of the patient's chest pain.
It's important to select interventions that are directly targeted at the patient's presenting symptoms and condition.
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