Which acute event is most likely to occur in a patient who has chronic atrial fibrillation?

Cerebral ischemia due to an embolus that originates in the left atrium.

Development of ventricular fibrillation.

Ischemia of the cerebellum due to a ruptured intracranial aneurysm.

Prolonged capillary refill secondary to a complete lack of cardiac output.

Answer and Explanation

The Correct Answer is A

Choice A rationale
Cerebral ischemia due to an embolus that originates in the left atrium is a common complication of chronic atrial fibrillation (AFib). AFib causes irregular and chaotic electrical signals in the atria, leading to poor blood flow and the formation of blood clots. These clots can travel to the brain, causing a stroke. This is the most acute and severe event associated with chronic AFib.
Choice B rationale
Development of ventricular fibrillation is a life-threatening arrhythmia that can occur in patients with severe heart disease, but it is not a common acute event in chronic AFib.
Ventricular fibrillation involves the ventricles and is characterized by rapid, erratic electrical impulses, leading to ineffective heart contractions and sudden cardiac arrest.
Choice C rationale
Ischemia of the cerebellum due to a ruptured intracranial aneurysm is not directly related to chronic AFib. While AFib increases the risk of stroke, it does not specifically cause aneurysms or cerebellar ischemia. Aneurysms are typically related to other risk factors such as hypertension and vascular abnormalities.
Choice D rationale
Prolonged capillary refill secondary to a complete lack of cardiac output is a sign of severe cardiac dysfunction or shock. While AFib can lead to heart failure and reduced cardiac output, it does not typically cause a complete lack of cardiac output. The most acute event related to AFib is the formation of emboli and subsequent stroke.

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Correct Answer is C

Explanation

Choice A rationale
Wearing an N95 mask is appropriate for airborne precautions, such as tuberculosis, but not specifically for MRSA, which requires contact precautions.

Choice B rationale
Wearing a facemask is suitable for droplet precautions, such as influenza, but MRSA is primarily spread through direct contact, not droplets.
Choice C rationale
Using a separate disposable blood pressure cuff for patients with draining wounds helps prevent the spread of MRSA. MRSA can be transmitted via contaminated medical equipment.
Choice D rationale
Strict hand washing measures are essential but should be performed more frequently than once every 8-hour shift. Hand hygiene should be practiced before and after patient contact.

A. Bacterial infection. B. Viral infection. C. Fungal infection. D. Parasitic infection.

Correct Answer is A

Explanation

Choice A rationale
Bacterial infection often leads to an elevated white blood cell count (15,000/mm³) and fever (38.5°C). The body’s immune response to bacterial pathogens results in these clinical manifestations.
Choice B rationale
Viral infections can cause fever, but they typically do not lead to a significant increase in white blood cell count.
Choice C rationale
Fungal infections can cause fever and elevated white blood cell count, but they are less common and usually occur in immunocompromised individuals.
Choice D rationale
Parasitic infections can cause fever and elevated white blood cell count, but they are less common and usually present with other specific symptoms.

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Which acute event is most likely to occur in a patient who has chronic atrial fibrillation?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is A

Explanation

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