Which patient’s condition would raise concerns regarding the administration of labetalol (Normodyne)?
A patient diagnosed with COPD.
A patient suffering from narrow-angle glaucoma.
A patient with hypertension.
A patient exhibiting tachycardia.
The Correct Answer is B
Choice A rationale:
COPD (Chronic Obstructive Pulmonary Disease) is a chronic lung disease that causes airflow obstruction. While labetalol can cause some bronchoconstriction, it is generally considered safe for use in patients with COPD. However, it's essential to monitor respiratory status closely, especially in those with severe COPD.
Choice B rationale:
Narrow-angle glaucoma is an eye condition characterized by increased intraocular pressure (IOP) due to impaired drainage of aqueous humor. Labetalol can exacerbate this condition by further increasing IOP through its beta-blocking effects. This can lead to acute angle-closure glaucoma, a medical emergency that can result in permanent vision loss.
Specific mechanisms by which labetalol can increase IOP:
Reduced aqueous humor production: Beta-blockers like labetalol can decrease the production of aqueous humor, the fluid that maintains eye pressure. While this might seem beneficial, a significant reduction can lead to anterior chamber shallowing, which can mechanically block the drainage angle and trigger angle closure.
Impaired uveoscleral outflow: Beta-blockers can also impair the uveoscleral outflow pathway, an alternative route for aqueous humor drainage that becomes more important in glaucoma patients. This can further contribute to IOP elevation.
Vasoconstriction of ciliary blood vessels: Labetalol's alpha-blocking effects can cause vasoconstriction of the ciliary blood vessels, which supply blood to the ciliary body responsible for aqueous humor production. This can reduce blood flow and indirectly hinder aqueous humor drainage.
Pupillary dilation: Beta-blockers can cause pupillary dilation, which can mechanically narrow the anterior chamber angle and obstruct aqueous humor outflow.
Therefore, labetalol is generally contraindicated in patients with known narrow-angle glaucoma.
Choice C rationale:
Hypertension (high blood pressure) is one of the primary indications for labetalol. It is an effective antihypertensive medication that works by blocking beta receptors, leading to decreased heart rate, contractility, and blood pressure.
Choice D rationale:
Tachycardia (fast heart rate) can also be treated with labetalol due to its beta-blocking effects. It helps to slow down the heart rate and restore a normal rhythm.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Rationale for Choice A:
Decreasing the morning insulin dose by half without consulting the provider could lead to hyperglycemia, which can be dangerous for patients with diabetes, especially those undergoing surgery.
It is important to individualize insulin doses based on the patient's blood glucose levels, insulin sensitivity, and other factors. The provider may need to assess the patient's blood glucose levels and adjust the insulin dose accordingly.
Rationale for Choice B:
It is not safe to assume that the provider would want the client to receive the usual insulin dose prior to surgery without confirming this with the provider.
Patients with diabetes who are NPO (nothing by mouth) are at risk for hypoglycemia, as they are not receiving their usual intake of carbohydrates.
It is important to adjust insulin doses to prevent hypoglycemia in these patients.
Rationale for Choice D:
Holding the morning dose of insulin until after a fasting glucose is done could lead to hyperglycemia, as the patient would not be receiving any insulin to cover their blood glucose levels.
It is important to administer insulin to patients with diabetes, even if they are NPO, to prevent hyperglycemia.
Rationale for Choice C:
This is the best action for the nurse to take because it ensures that the provider is aware of the situation and can provide appropriate orders for the patient's insulin management.
The provider may need to adjust the insulin dose, order a fasting glucose level, or provide other instructions for the patient's care.
It is important to communicate with the provider to ensure that the patient receives safe and appropriate care.
Correct Answer is B
Explanation
Choice A rationale:
Requesting an order for morphine sulfate IV 2 mg over 1-5 minutes would not be appropriate at this time for several reasons: The patient has already received a dose of 4 mg 15 minutes ago, and it has not been effective in relieving the chest pain.
The patient is showing signs of increased respiratory effort, which could be a sign of respiratory depression. Administering an additional dose of morphine could worsen the respiratory depression.
The patient's heart rate is 82 beats per minute, which is within the normal range.
The patient's blood pressure is 135/88 mm Hg, which is also within the normal range.
Choice C rationale:
Administering naloxone (Narcan) to counteract respiratory depression would not be appropriate at this time because the patient is not showing signs of severe respiratory depression. Naloxone is a medication that is used to reverse the effects of opioid overdose. It is typically only used in situations where the patient is experiencing life-threatening respiratory depression.
Choice D rationale:
Administering morphine sulfate IV 4 mg over 1-5 minutes would not be appropriate for the reasons listed above. It could worsen the patient's respiratory depression and potentially lead to other complications.
Choice B is the best answer because it is the most conservative and safest option. By withholding the next dose of morphine and informing the provider about the patient's symptoms, the nurse can ensure that the patient receives the appropriate care and that any potential complications are avoided.
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