Large Left Atrial Appendage Causing Cryptogenic Stroke.

Area of Science:

• Cardiology
• Neurology
• Vascular Medicine

Background:

• Cryptogenic stroke, accounting for 25% of ischemic strokes, often lacks an identifiable cause.
• Structural cardiac abnormalities like patent foramen ovale, atrial septal defects (ASD), and large left atrial appendages (LAA) are recognized risk factors.
• The role of LAA in cryptogenic stroke pathogenesis requires further elucidation.

Observation:

• A case study involving a patient with a history of surgically repaired ASD presented with acute cryptogenic stroke.
• Diagnostic evaluations, including transthoracic echocardiogram and transesophageal echocardiogram, revealed a large LAA.
• No thrombus was identified within the LAA, and no arrhythmias were detected in the patient.

Findings:

• The presence of a large LAA, even without detectable thrombus, is highlighted as a potential contributor to cryptogenic stroke.
• This case underscores the significance of the LAA in the development of cryptogenic strokes, particularly in patients with pre-existing cardiac conditions.

Implications:

• Emphasizes the need to consider the LAA as a significant factor in cryptogenic stroke etiology.
• Suggests a potential need for revised or clearer clinical guidelines regarding anticoagulation therapy in patients with large LAAs and cryptogenic stroke.