A patient was brought to the emergency ward with numbness and weakness on one side of his body, slurred speech, difficulty in walking and dizziness. After taking a CT scan, the doctor diagnosed it as an embolic stroke. Which of the following conditions places the client at the risk of a thromboembolic stroke?

Appeared in: AIIMS Jodhpur SNO-2023

Explanation

Atrial fibrillation (AFib) is the most common cardiac arrhythmia that predisposes a patient to embolic stroke.
The chaotic and rapid electrical impulses in AFib cause the atria to quiver instead of contracting effectively, leading to blood stasis (pooling).
This stagnant blood, especially in the left atrial appendage, is a prime environment for thrombus (clot) formation.
A fragment of this clot can dislodge, travel (embolize) to the brain, and occlude a cerebral artery, resulting in an embolic stroke.
Cardioembolism, with AFib being the leading cause, accounts for approximately 20% of all ischemic strokes.

Option B: Guillain-Barré syndrome is an autoimmune polyneuropathy affecting the peripheral nervous system. It causes ascending muscle weakness and paralysis but does not involve the formation of cardiac emboli.
Option C: Multiple sclerosis is a chronic, autoimmune demyelinating disease of the central nervous system. It causes a variety of neurological deficits over time but is not a source of thromboembolism.
Option D: Bradycardia is a slow heart rate (less than 60 bpm). It can lead to symptoms of low cardiac output like dizziness or syncope, but it does not promote the blood stasis and clot formation characteristic of atrial fibrillation.

Visual 1: Diagram - An illustration comparing a normal heart rhythm to atrial fibrillation, highlighting the quivering atria and the formation of a blood clot in the left atrial appendage.
Visual 2: Flowchart - A flowchart showing the sequence: Atrial Fibrillation → Blood Stasis → Thrombus Formation → Embolus → Cerebral Artery Occlusion → Ischemic Stroke.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Etiology and Risk Factors for Cardioembolic Stroke in acute care settings.
Nurses play a critical role in identifying patients with atrial fibrillation by checking for an irregularly irregular pulse during routine vital sign assessment.
Administering anticoagulant medications as prescribed and monitoring for both therapeutic effects (stroke prevention) and adverse effects (bleeding) is a key nursing responsibility for patients with AFib.
Patient education on the signs of stroke (FAST: Face drooping, Arm weakness, Speech difficulty, Time to call emergency services) is vital for early intervention.

How to Approach the Question

First, identify the key diagnosis in the clinical scenario: 'embolic stroke'.
Understand the meaning of 'embolic': a blockage caused by an object (an embolus, usually a blood clot) that has traveled from another part of the body.
The question asks for a risk factor. Therefore, you need to find the condition among the options that is a known source of emboli.
Evaluate each option: Atrial fibrillation is a well-known cause of cardiac clots. Guillain-Barré and Multiple Sclerosis are neurological disorders, not sources of emboli. Bradycardia is a slow heart rate and does not typically cause clot formation.
Conclude that atrial fibrillation is the only condition listed that directly leads to the formation of thrombi that can embolize to the brain.

Concept Tested & Keywords

Concept Tested: Etiology and Risk Factors for Cardioembolic Stroke
Stem keywords: embolic stroke, numbness, weakness, slurred speech, risk factor
Lead-in keywords: places the client at the risk
Clinical cues: The diagnosis of embolic stroke points towards a cause where a clot travels from another part of the body, most commonly the heart.

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