Mr. Smith is scheduled for an implantable cardioverter defibrillator (ICD) procedure to treat dysrhythmia.
What is the primary function of this procedure?
To block impulse transmission to the AV node.
To assume the function of the SA node.
To trigger electrical impulses to the heart.
To increase ventricular conduction.
The Correct Answer is C
Choice A rationale:
Blocking impulse transmission to the AV node is not the primary function of an ICD. This is typically achieved through medications such as beta blockers or calcium channel blockers, or through a procedure called AV node ablation.
While ICDs can sometimes have a secondary effect of slowing AV node conduction, their primary purpose is to actively monitor heart rhythm and deliver electrical shocks when necessary to restore normal rhythm.
Choice B rationale:
Assuming the function of the SA node is not the primary function of an ICD. The SA node, located in the right atrium, is the natural pacemaker of the heart, responsible for initiating electrical impulses that trigger each heartbeat.
While ICDs can sometimes pace the heart if the SA node is not functioning properly, their primary purpose is to intervene when life-threatening arrhythmias occur, rather than to continuously regulate heart rate.
Choice C rationale:
Triggering electrical impulses to the heart is the core function of an ICD. It continuously monitors heart rhythm and can deliver electrical shocks to restore normal rhythm when it detects potentially dangerous arrhythmias, such as ventricular tachycardia or ventricular fibrillation.
These shocks are designed to interrupt chaotic electrical activity in the heart and allow the natural pacemaker to regain control, preventing cardiac arrest and sudden cardiac death.
Choice D rationale:
Increasing ventricular conduction is not the primary function of an ICD. In fact, in some cases, ICDs may actually slow down ventricular conduction to prevent certain types of arrhythmias.
Medications or procedures such as cardiac resynchronization therapy (CRT) are specifically designed to improve ventricular conduction in patients with heart failure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Atrial fibrillation (AF) is characterized by the absence of P waves on the ECG, the presence of fibrillatory waves, and an irregularly irregular rhythm. This is due to chaotic electrical activity in the atria, which results in disorganized atrial contractions. The fibrillatory waves, which are often described as "f" waves or "sawtooth" waves, represent the rapid and irregular electrical activity in the atria. They are typically best seen in lead II, V1, or V2 of the ECG.
Here is a more detailed explanation of the key features of AF that support this answer:
Absence of P waves: In normal sinus rhythm, the P wave represents the electrical impulse that originates in the sinoatrial (SA) node and depolarizes the atria. In AF, the SA node is no longer in control of the atrial rhythm, and there is no organized atrial depolarization. As a result, P waves are absent on the ECG.
Presence of fibrillatory waves: The fibrillatory waves seen in AF represent the disorganized electrical activity in the atria. They are typically irregular in amplitude and frequency, and they can vary in appearance from patient to patient.
Irregularly irregular rhythm: The ventricular rhythm in AF is also irregular because the impulses from the atria are not conducted to the ventricles in a regular pattern. This results in an irregularly irregular rhythm, which is a hallmark feature of AF.
Key points to remember:
AF is the most common type of cardiac arrhythmia.
It can be asymptomatic or cause a variety of symptoms, including palpitations, shortness of breath, fatigue, and lightheadedness.
AF is a risk factor for stroke and heart failure.
Treatment for AF may include medications to control heart rate or rhythm, blood thinners to reduce the risk of stroke, and in some cases, procedures to restore normal heart rhythm.
Correct Answer is ["A","B","D"]
Explanation
Choice A rationale:
Pain relief is a primary benefit of morphine administration in the setting of myocardial infarction.
Pain can trigger a stress response, leading to increased heart rate, blood pressure, and myocardial oxygen demand.
Morphine effectively reduces pain, thereby lessening the stress response and its detrimental effects on the heart.
This helps to minimize myocardial ischemia and potential further damage to the heart muscle.
Pain control also improves patient comfort and overall well-being, which can indirectly contribute to better cardiac outcomes.
Choice B rationale:
Sedation is another important benefit of morphine in this context.
It promotes rest and relaxation, which can lower heart rate, blood pressure, and myocardial oxygen demand.
This is crucial for patients with myocardial infarction, as their hearts require reduced workload to heal and recover.
Sedation also helps to alleviate anxiety and agitation, which can further strain the heart.
By inducing a state of calmness, morphine can indirectly protect the heart from additional stress.
Choice C rationale:
While morphine does have diuretic effects, increasing urinary output is not a primary goal in the management of myocardial infarction.
In fact, excessive diuresis could potentially lead to dehydration and hypotension, which could be detrimental to cardiac function.
Therefore, while morphine may slightly increase urine output, this is not a major reason for its use in this setting.
Choice D rationale:
Decreasing myocardial demand is a key benefit of morphine administration in patients with myocardial infarction.
Morphine achieves this by:
Reducing pain and the associated stress response
Promoting sedation and relaxation
Diminishing anxiety and agitation
Exerting a direct vasodilatory effect on blood vessels
This collective action of morphine leads to a decrease in heart rate, blood pressure, and the heart’s overall workload.
As a result, the heart requires less oxygen and experiences reduced strain, allowing for better healing and recovery following a myocardial infarction.
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