For about one-third of stroke patients, the cause of their cerebrovascular accident (CVA) is unknown at the time of hospitalization, but crucial to determine to prevent subsequent strokes. Electrocardiogram (ECG) monitoring in the 24 to 48 hours after a stroke detects atrial fibrillation (AF) in about 5% of patients. Remote monitoring with a noninvasive device detects far more cases and provides the opportunity to quickly head off secondary strokes, preserving lives and reducing costs of care, according to a study published by Royal Philips NV researchers.