Ultra-Early Continuous ECG Monitoring for Silent Atrial Fibrillation Diagnosis in Cryptogenic Stroke: The CRIPTOFAST...

Area of Science:

• Cardiology
• Neurology
• Medical Devices

Background:

• Cryptogenic strokes (CS) account for one-third of stroke admissions, often caused by undetected paroxysmal atrial fibrillation (PAF).
• Current guidelines offer unclear recommendations on using internal loop recorders (ILR) for CS patients.
• Subtle left atrial (LA) anomalies identified via ultrasound may help identify CS patients who could benefit from ILR implantation to detect silent PAF.

Purpose of the Study:

• To evaluate the efficacy of early ILR implantation for detecting silent PAF in CS patients compared to standard care.
• To identify clinical and ultrasound predictors of PAF in CS patients.
• To assess the utility of subtle LA anomalies in selecting patients for ILR.

Main Methods:

• A randomized, controlled, open-label trial involving 59 CS patients.
• Patients were assigned to either early ILR implantation or standard care.
• Subgroup analysis focused on the presence of LA anomalies (dilatation, reduced strain, or ejection fraction).

Main Results:

• Early ILR implantation led to a significantly higher diagnosis rate of silent PAF (43.3%) compared to standard care (7.1%).
• Most PAF events were detected within 100 days of ILR implantation.
• Patients with abnormal LA features had a substantially higher PAF diagnosis rate with ILR (58.8%) versus standard care (7.7%).

Conclusions:

• Early ILR implantation is effective in detecting silent PAF in CS patients.
• Patients exhibiting abnormal LA features may derive the most significant benefit from early ILR monitoring.
• ILR use can improve the diagnostic yield for silent PAF in select CS populations.