considered a pathology. 3,4 It has been observed that the incidence of PFO in the population decreases with age and is about 34% in the first 3 decades of life, 25% in the fourth to eighth decades, and 20% in the ninth decade. 3-5 This is explained by late spontaneous closures of PFO or greater mortality in patients with PFO. 4 When pressure in the right atrium is increased, the duct may open and a short right-left shunt may occur; moreover, potential embolic material may enter the systemic circulation. 1-8 In addition, thrombus formation and release from the PFO channel is also possible, especially in the presence of atrial septal aneurysm (ASA). Vasoactive substances,