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A cohort of 2580 patients with pacemakers or defibrillators were monitored for 3 months to detect subclinical atrial tachyarrhythmias. Patients with subclinical atrial tachyarrhythmias had a significantly increased risk of subsequent ischemic stroke.
Atrial fibrillation may be asymptomatic and consequently subclinical.
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Epidemiologic studies indicate that many patients with atrial fibrillation on screening electrocardiograms had not previously received a diagnosis of atrial fibrillation.
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About 15% of strokes are attributable to documented atrial fibrillation, and 50 to 60% to documented cerebrovascular disease,
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but in about 25% of patients who have ischemic strokes, no etiologic factor is identified.
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Subclinical atrial fibrillation is often suspected to be the cause of stroke in these patients.
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However, the prevalence and prognostic value of subclinical atrial fibrillation has been difficult to assess.
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An . . .