Relationship Between Sleep Apnea Syndrome and Patent Foramen Ovale Among Victims of Cryptogenic Ischemic Stroke

Inclusion Criteria: \- Patients who have had a cerebral or retinal infarction confirmed by brain imaging or a defined transient ischemic attack without an identifiable cause after a detailed etiological assessment Exclusion Criteria: * Identification of a cause of ischemic stroke: * Atheromatous stenosis \> 50% (or atherosclerotic plaque \< 50% threatening) of supra aortic trunk or intracranial arteries on echodoppler of the supra aortic trunk and transcranial or scanner angiography. * Emboligenic heart disease : atrial fibrillation and atrial flutter, thrombus in left atrium, spontaneous contrast in left atrium, decreased atrial flow, left ventricular ejection fraction (LVEF) \< 40%, LV aneurysma, left intraventricular thrombus, recent myocardial infarction, cardiomyopathy ventricular dilated left with LVEF \< 35%, mitral stenosis, prosthetic mitral or aortic valve, infectious and non-infectious endocarditis, valve or mural tumor, complicated aortic arch atheroma (plaque \> = 4 mm, ulcerated plaque, thrombus on plaque), aortic dissection * Lacunar infarction symptomatic = \< 1.5 cm on the CT scan, = \< 2 cm on the diffusion MRI or the FLAIR. * No atherosclerotic arteriopathy : dissection, primary and secondary angitis, spastic angiopathy, etc… * Coagulopathy to come a long-term anticoagulant treatment (\> 6 months) (anti-phospholipid syndrome, thrombophilia). * Blood disorders and cancer * Recent intravenous drug use (in the 6 months before the stroke). *…