Are all cardio-embolic strokes embolic? An autopsy study of 100 consecutive acute ischaemic strokes

Area of Science:

• Neurology
• Cardiology
• Pathology

Background:

• Estimates of ischemic stroke etiology, especially cardio-embolic stroke, show significant variation.
• Accurate classification of stroke subtypes is crucial for effective prevention and treatment strategies.

Purpose of the Study:

• To determine the incidence of cardio-embolic stroke in acute ischemic stroke cases.
• To establish clear criteria for differentiating cardio-embolic stroke from other etiologies.
• To investigate potential underrecognized causes of stroke, such as cerebral hypoperfusion.

Main Methods:

• Retrospective autopsy study of 100 patients with acute ischemic stroke.
• Defined specific criteria to distinguish cardio-embolic strokes from other types.
• Analyzed autopsy findings for thrombus, thrombo-embolus, and cardiac disease.

Main Results:

• Cardio-embolic stroke accounted for 26% of acute ischemic strokes.
• Other identified causes included thrombotic (28%), atheromatous (12%), and hypoperfusion (11%).
• A higher incidence of non-hypertensive cardiac disease was observed in strokes without clear embolic or thrombotic sources, suggesting potential hypoperfusion.

Conclusions:

• Cardio-embolic stroke represents a significant proportion of acute ischemic strokes.
• Cerebral hypoperfusion may be an underrecognized cause of ischemic stroke, particularly in patients with cardiac disease but no identified embolic source.
• Further research into hemodynamic and hypoperfusion mechanisms is warranted.