We suspect that he suffers from poor blood supply to the back side of the brain. As his condition was critical, he was put on a ventilator support. We are running a few tests to confirm this," Chandanwale said. "Kulkarni's condition, which is medically termed as vertebrobasilar insufficiency (VBI), is a temporary set of symptoms due to decreased blood flow (ischemia) in the posterior circulation of the brain. A few hours later he regained consciousness..