Patent Foramen Ovale and Cryptogenic Stroke in Older Patients

The cause of stroke remains unidentified by routine diagnostic testing in about 40% of patients. One potential cause of embolic stroke is a patent foramen ovale, which enables right-to-left intracardiac shunting. The foramen ovale remains open in about one fourth of the general population. The prevalence decreases gradually with increasing age, from 34% during the first three decades to 20% during the ninth decade.

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