Abstract
A patent foramen ovale (PFO) is a highly prevalent structure among the adult population. It allows the shunt of blood through the inter-atrial septum and has been associated with cryptogenic stroke, transient ischemic attack, significant right to left shunting resulting in resting and exercise-induced hypoxemia, platypnea orthodeoxia syndrome, and decompression sickness after scuba diving and migraines. Currently, transthoracic and transesophageal echocardiography and transcranial Doppler are the most important diagnostic tools, for the diagnosis of PFO. The sensitivity and specificity of the study depend on the modalities available: transthoracic (TTE), transesophageal (TEE), and transcranial Doppler (TCD), as well as the intravenous use of agitated saline and the site of injection.
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