The aim of the research was to study risk factors of development of re-ischemic stroke. Clinical and laboratory investigation of 46 patients with ischemic stroke was conducted. In group I the asymptomatic form of an ischemic insult was revealed in 22 (47,8%) of patients, of which 13 (59%) of patients one transferred insult, and at the others of 9 (41%) - more than one insult is revealed. In group with the diagnosed repeated asymptomatic insult, an arterial hypertensia came to light at 24 (100%) of patients, reliably above (p<0,01) the ischemic heart disease 13 (59,0%) and chronic heart condition 18 (81,8%) diagnosed. On МRT at 36,4% of patients with the diagnosed repeated asymptomatic insult the centers are located in the same pool of blood supply of the same hemisphere, as at the first insult, that reliably (р<0,01) correlated with a degree of expressiveness of neurologic deficiency. The obtained given assessments of risk factors of progress of an insult assist early revealing of asymptomatic insults.