The nurse administers IV nitroglycerin to a client diagnosed with an acute myocardial infarction. In evaluating the effectiveness of this intervention, the nurse should monitor for:

decrease in heart rate.

relief of chest pain.

decrease in cardiac dysrhythmias.

decrease in blood pressure.

Answer and Explanation

The Correct Answer is B

A. Decrease in heart rate: While nitroglycerin can sometimes cause reflex tachycardia (an increase in heart rate) as a compensatory mechanism in response to a decrease in blood pressure, its primary effect is on reducing myocardial oxygen demand through vasodilation. Although heart rate may decrease in some situations due to improved perfusion or as a secondary response to pain relief, a decrease in heart rate is not the most reliable or immediate indicator of effectiveness in this context. The relief of chest pain is a more direct measure of the drug's impact.

B. Relief of chest pain: Nitroglycerin works by dilating blood vessels, which reduces myocardial oxygen demand and improves blood flow to the heart, particularly in cases of acute myocardial infarction (MI). The primary therapeutic goal is to relieve chest pain (angina) and reduce the workload of the heart. Monitoring for relief of chest pain is the most direct and important indicator of the medication's effectiveness. If the chest pain decreases or resolves, it suggests that the medication is helping to alleviate the ischemia caused by the MI.

C. Decrease in cardiac dysrhythmias: Nitroglycerin is not primarily used to treat dysrhythmias, although improved perfusion and reduced myocardial oxygen demand may indirectly reduce the occurrence of dysrhythmias in some cases. However, a decrease in dysrhythmias is not a primary goal of nitroglycerin therapy, and the nurse should not primarily monitor for this outcome. Any dysrhythmias should be managed with other specific interventions if needed.

D. Decrease in blood pressure: Nitroglycerin's vasodilatory effect does lead to a reduction in blood pressure, particularly in patients with high blood pressure or in the context of a myocardial infarction. However, excessive hypotension can be dangerous and may lead to inadequate perfusion of vital organs. The nurse must monitor blood pressure closely to avoid hypotension, but a decrease in blood pressure is not the main goal of therapy. The primary objective is to relieve the chest pain associated with the MI. If blood pressure drops too low, it may indicate a need to adjust the dose or discontinue the nitroglycerin.

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Correct Answer is D

Explanation

A. Encourage the daily use of the incentive spirometer: While the use of an incentive spirometer is important for improving lung expansion and preventing atelectasis, it may not be effective unless the client’s pain is well-managed. If pain is not addressed first, the client may be unable or unwilling to use the incentive spirometer properly, thus delaying recovery and increasing the risk of respiratory complications.

B. Assisting the client with ambulation in the hallway: Ambulation is an important post-operative activity for improving circulation and preventing complications such as deep vein thrombosis (DVT) or pneumonia. However, the priority at this time should be addressing the client's pain and ensuring adequate breathing before attempting more strenuous activities like ambulation. If the client is in pain and not breathing effectively, ambulation could exacerbate respiratory difficulties..

C. Increasing the chest tube suction to 44 mmHg: Increasing chest tube suction is not indicated unless there is evidence of inadequate drainage or a specific complication, such as a pneumothorax or pleural effusion. In this case, the priority is to address the client’s respiratory function, which is more likely to improve with pain relief, deep breathing, and appropriate positioning. Suctioning should only be adjusted if there is a clinical reason such as signs of a pneumothorax or inadequate drainage, which is not indicated by the information provided.

D. Assessing for adequate pain relief: The most urgent intervention in this scenario is ensuring that the client has adequate pain relief. The client’s shallow respirations and guarding of the operative site suggest that pain is inhibiting effective breathing and deep inspiration, which is crucial for preventing atelectasis and improving ventilation. Pain control is essential in promoting optimal respiratory function, as uncontrolled pain can lead to shallow breathing, reduced lung expansion, and compromised gas exchange, all of which can increase the risk of acute respiratory failure. Once pain is managed, the client will be better able to engage in other respiratory interventions

A. sublingual nitroglycerin each day to prevent chest pain." B. clopidergrol to prevent clots from forming." C. atorvastatin at bedtime to reduce my cholesterol levels." D. metoprolo! to decrease my heart's need for oxygen."

Correct Answer is A

Explanation

A. Sublingual nitroglycerin each day to prevent chest pain:
The statement about taking sublingual nitroglycerin daily is incorrect. Sublingual nitroglycerin is prescribed as needed for acute chest pain (angina) or for relieving chest discomfort associated with myocardial infarction (MI). It is not intended for daily use as a preventive measure. The client should be educated to use sublingual nitroglycerin only when experiencing chest pain, and if the pain persists or worsens, they should seek immediate medical help. Daily or routine use of nitroglycerin should be avoided unless specifically instructed by a healthcare provider. The client should also be educated about other preventive measures like long-acting nitrates if needed for chest pain prevention.

Explanation of other options:

B. Clopidogrel to prevent clots from forming:
This statement is correct. Clopidogrel (Plavix) is an antiplatelet medication commonly prescribed after a myocardial infarction to help prevent the formation of blood clots, which can reduce the risk of future cardiovascular events such as stroke or further heart attacks. It works by inhibiting platelets from clumping together, which is crucial in the post-MI period.

C. Atorvastatin at bedtime to reduce my cholesterol levels:
This statement is correct. Atorvastatin is a statin medication that is used to lower cholesterol levels, particularly LDL cholesterol (the "bad" cholesterol), which contributes to atherosclerosis and increases the risk of further heart problems. Statins are often prescribed after a myocardial infarction to help reduce the risk of future events. Taking atorvastatin at bedtime is also a common recommendation because cholesterol synthesis is higher during the night.

D. Metoprolol to decrease my heart's need for oxygen:
This statement is correct. Metoprolol is a beta-blocker that reduces the heart rate and blood pressure, which in turn lowers the heart's oxygen demand. After a myocardial infarction, beta-blockers like metoprolol are commonly prescribed to prevent further heart damage, reduce ischemia, and decrease the likelihood of arrhythmias. They help in the management of heart failure as well by improving the heart's efficiency.

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