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.
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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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Cellulitis is characterized by a red, swollen, and warm area on the skin, often accompanied by fever. It is a bacterial infection of the skin and underlying tissues.
Choice B rationale
Deep vein thrombosis (DVT) typically presents with swelling, pain, and warmth in the affected leg but not redness and fever as primary symptoms.
Choice C rationale
Osteomyelitis involves infection of the bone, presenting with localized pain, swelling, and fever, but not typically a red, swollen area on the skin.
Choice D rationale
Gout causes joint pain, swelling, and redness, usually in the big toe, but not a red, swollen area on the leg.
Correct Answer is A
Explanation
Choice A rationale
Septic shock is a severe infection leading to systemic inflammation, characterized by high fever (39°C), low blood pressure (90/60 mmHg), and signs of organ dysfunction. It is a medical emergency requiring immediate intervention.
Choice B rationale
Cardiogenic shock is caused by the heart’s inability to pump blood effectively, leading to hypotension and signs of poor perfusion, but not necessarily high fever.
Choice C rationale
Neurogenic shock results from a disruption in the autonomic pathways, leading to hypotension and bradycardia, but not high fever.
Choice D rationale
Anaphylactic shock is a severe allergic reaction causing hypotension, respiratory distress, and other symptoms, but not typically high fever.
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