Okamoto et al. found some rats that have cerebrovascular lesion in SHR rats (especially in line A). This strain was established in 1974 and named stroke-prone SHR (SHRSP) rat.
Life expectancy of this strain is a half of WKY rat (male: average 212 days, female: average 340 days). This strain shows similar symptoms to human stroke. The incidence of hypertensive cerebrovascular lesion is over 90% and this lesion tend to occur in the back of the head.