[Event recorder in cryptogenic stroke : Accepted and feasible indications]

Area of Science:

• Cardiology
• Neurology
• Medical Devices

Background:

• Cryptogenic stroke remains a diagnostic challenge, with approximately 30% linked to undiagnosed atrial fibrillation (AF).
• Conventional diagnostic methods often fail to identify the source of stroke in a significant patient subset.
• Silent AF poses a risk for embolic events, including stroke and transient ischemic attack (TIA).

Purpose of the Study:

• To evaluate the efficacy of prolonged ECG monitoring using implanted event recorders for detecting atrial fibrillation in cryptogenic stroke patients.
• To assess the optimal duration for monitoring to maximize the yield of AF detection.
• To highlight the role of implanted cardiac monitors in managing patients with unexplained stroke.

Main Methods:

• Utilizing implanted cardiac event recorders for extended monitoring periods (up to 36 months).
• Incorporating telemonitoring features in newer devices for real-time data transmission.
• Analyzing data from studies like Crystal AF to determine AF detection rates.

Main Results:

• Prolonged monitoring significantly increases the detection rate of atrial fibrillation compared to shorter monitoring periods.
• Implanted event recorders, particularly over 2-3 years, are effective for identifying silent AF.
• Telemonitoring facilitates prompt detection and initiation of anticoagulant therapy.

Conclusions:

• Extended monitoring with implanted cardiac event recorders is a valuable strategy for diagnosing AF in cryptogenic stroke.
• Considering implantation in patients with prior neurological symptoms and unidentified stroke sources is recommended.
• Early detection of AF through prolonged monitoring enables timely initiation of crucial therapies like oral anticoagulation.