Drawbacks and Unexpected Advantages of the Response to Modeling Posttraumatic Stress Disorder in Old Wistar Rats.

In modeling post-traumatic stress disorder (PTSD), old Wistar rats exhibit the same general signs of a PTSD-like condition as young rats do. The ratio of testosterone to corticosterone levels was assessed as a new index and proved to provide a guideline for dividing the rat population into low- and high-anxiety groups when modeling PTSD. Several features were observed in behavior, psycho-emotional manifestations, hormone levels, and myocardial state in old rats. A sharp rise in circulating testosterone was for the first time shown to occur in old, but not young, rats in stress, contributing to a more rapid decision as to where to move in the labyrinth space. Priority data were obtained on dysfunctional accumulation of mitochondria in the myocardium in intact and stressed old rats. The information obtained may be useful in developing drugs against harmful consequences of PTSD and senile changes in the myocardium.