Embolic Stroke of Undetermined Source: A Population with Left Atrial Dysfunction

Area of Science:

• Cardiology
• Neurology
• Stroke Research

Background:

• Embolic stroke of undetermined source (ESUS) accounts for a quarter of ischemic strokes with high recurrence rates.
• Understanding ESUS is crucial for improving treatment and prevention strategies.
• This study investigates left atrial (LA) structure and function in ESUS patients.

Purpose of the Study:

• To test the hypothesis that LA shape and function are abnormal in ESUS patients compared to healthy controls.
• To assess resting and exercise-induced changes in LA function in ESUS.
• To identify potential markers for stroke prevention in ESUS.

Main Methods:

• Prospective enrollment of 18 ESUS patients and matched healthy controls.
• Measurement of LA function at rest and during supine bicycle exercise using 2D and 3D echocardiography.
• Matching of ESUS and control groups by age, gender, and body surface area.

Main Results:

• ESUS patients exhibited larger LA end-diastolic volumes at rest and during exercise compared to controls.
• LA function, measured by ejection fraction and function index, showed a lack of response to maximal exercise in ESUS.
• 3D analysis revealed spherical LA remodeling in ESUS patients, indicated by an increased sphericity index.

Conclusions:

• ESUS patients demonstrate significant left atrial dysfunction and remodeling at rest and during exercise.
• These findings support the hypothesis of abnormal LA characteristics in ESUS.
• Left atrial evaluation in ESUS may offer insights into stroke prevention and guide future research.