A patient diagnosed with STEMI has undergone successful primary PCI and is now receiving aspirin and a P2Y12 inhibitor (e.g., clopidogrel). What is the rationale for prescribing these medications post-PCI?
To promote adequate hydration and reduce kidney strain.
To reduce the risk of thromboembolism and prevent restenosis of the artery.
To reduce the patient's pain and anxiety levels.
To control the patient's blood pressure and prevent hypotension.
The Correct Answer is B
Choice A rationale
Aspirin and P2Y12 inhibitors like clopidogrel do not have a physiological role in promoting hydration or reducing kidney strain. In fact, the contrast dye used during the PCI procedure itself is what poses a risk to the kidneys, necessitating hydration with intravenous fluids. Antiplatelet medications are focused entirely on the hematologic system. There is no scientific evidence suggesting that these specific drug classes improve renal perfusion or assist in the filtration of metabolic waste products.
Choice B rationale
The primary rationale for dual antiplatelet therapy is to prevent stent thrombosis and arterial restenosis. Aspirin inhibits thromboxane A2, while clopidogrel blocks the adenosine diphosphate receptor on platelets. Together, they provide synergistic inhibition of platelet activation and aggregation. This is vital because the newly placed stent is a pro-thrombotic surface until it is covered by the patient's own endothelial cells. Preventing a clot from forming at the site of the intervention is crucial for survival.
Choice C rationale
These medications are not analgesics or anxiolytics. Aspirin has some anti-inflammatory properties, but at the low doses used for cardiac protection, its effect on pain is negligible. Anxiety is typically managed with nursing interventions, benzodiazepines, or counseling. Using antiplatelet agents is a strictly physiological intervention aimed at blood chemistry and vessel patency rather than the psychological or sensory comfort of the patient. Effective pain control post-PCI is usually achieved by addressing the underlying ischemia.
Choice D rationale
While blood pressure control is important after a myocardial infarction, aspirin and clopidogrel are not antihypertensive medications. They do not affect the systemic vascular resistance or the force of cardiac contraction. Blood pressure management is usually handled with beta-blockers, ACE inhibitors, or calcium channel blockers. Using antiplatelet therapy specifically targets the coagulation cascade to prevent the recurrence of a myocardial infarction by keeping the coronary arteries open and free from obstructive blood clots. .
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale
Conduction delay through the atrioventricular node typically characterizes first degree heart block rather than atrial fibrillation. In atrial fibrillation, the atrioventricular node actually acts as a gatekeeper, attempting to block the overwhelming number of electrical impulses arriving from the atria. Slowed conduction would result in a bradycardic rhythm, whereas the dizziness and palpitations described by the client are usually associated with the rapid and irregular ventricular response common in this dysrhythmia.
Choice B rationale
Atrial fibrillation involves disorganized electrical activity originating from multiple ectopic foci within the atria, bypassing the sinoatrial node. This results in rapid, chaotic impulses that cause the atria to quiver rather than contract effectively. This loss of atrial kick and the subsequent irregular ventricular rate significantly reduce cardiac output and stroke volume. The resulting decrease in cerebral perfusion leads to dizziness, while the irregular, rapid heartbeats are perceived by the client as palpitations.
Choice C rationale
A sinoatrial node firing at a rate greater than 100 beats per minute defines sinus tachycardia, which is a regular rhythm. While sinus tachycardia can cause palpitations during exercise or stress, it does not involve the chaotic atrial activity seen in fibrillation. In atrial fibrillation, the sinoatrial node is no longer the primary pacemaker. The atrial rate in fibrillation can exceed 350 to 600 impulses per minute, which is far beyond the normal physiological limits of sinus tachycardia.
Choice D rationale
An electrical signal occurring before the expected sinus impulse describes a premature atrial contraction or a premature ventricular contraction. While these ectopics can cause a sensation of a skipped beat or palpitations, they are isolated events within an otherwise stable rhythm. Atrial fibrillation is a sustained and continuous state of electrical chaos rather than a single premature beat. Therefore, isolated premature signals do not explain the persistent dizziness and ongoing palpitations associated with this specific cardiac condition.
Correct Answer is A
Explanation
Choice A rationale
Pericardiocentesis is the urgent removal of fluid from the pericardial sac using a needle. The client is demonstrating Beck's triad, which includes hypotension, muffled heart sounds, and jugular venous distention, indicating cardiac tamponade. This condition occurs when fluid accumulation increases intrapericardial pressure, preventing the ventricles from filling during diastole. By draining the fluid, the nurse anticipates restoring cardiac output and preventing total cardiovascular collapse, which is the primary goal in this life-threatening obstructive shock state.
Choice B rationale
A left ventricular assist device is a mechanical pump used to support heart function and blood flow in people with weakened hearts, usually during end-stage heart failure. While it improves systemic perfusion, it is not a treatment for pericardial effusion or tamponade. Inserting such a device while the heart is compressed by external fluid would not resolve the pressure issues and would be an inappropriately invasive and ineffective response to an acute tamponade emergency.
Choice C rationale
Septal myectomy is a surgical procedure performed to remove a portion of the thickened septal wall in patients with hypertrophic obstructive cardiomyopathy. This surgery aims to relieve the outflow tract obstruction and improve blood flow from the left ventricle. It is a planned, elective procedure for chronic structural issues rather than an emergency intervention for acute pericardial effusion. It does nothing to relieve the external pressure caused by fluid buildup within the pericardial lining.
Choice D rationale
Synchronized electrical cardioversion is used to treat hemodynamically unstable tachydysrhythmias, such as atrial fibrillation or ventricular tachycardia with a pulse, by delivering a timed shock. However, the hypotension and muffled heart sounds in this scenario are caused by mechanical compression from fluid, not an electrical conduction problem. Shocking a patient in tamponade would be ineffective and potentially harmful, as it fails to address the underlying physical obstruction that is preventing ventricular filling and stroke volume.
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