A patient with infarction and PFO,which factor increases the risk that PFO is the causal mechanism ?

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COCLUSION. Thanks Dr Anand for the correct answer. PFO with large intracardiac shunt. A patent foramen ovale is most likely to he a causal of stroke in young patients with cryogenic stroke,embolus appearing brain infarct,no vascular comorbidities, and a large patient foramen ovale with substantial right - to - left shunting.

Size of pfo Right to left shunt

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Thank you mam