cryptoginic stroke might require assessment with longer cardiac telemetry in an effort to identify paroxysmal AF.TEE usually is restricted to patients who have unexplained stroke (i.e.,with no risk factors for stroke).TEE is useful when there is concern about a possible patent foramen ovale in patient with the possibility of paradoxical cereblal embolus. TEE is useful to assess the left atrium and left atrial appendege and to more effectively assess the aortic arch for atheromata. Vegetatations,either septic or nonseptic,as well as thrombus formation tend to be bestter detected with TEE.concern about possible bacterial endocarditis mandates blood cultures.