. >> reporter: this is dr. mida in a video from 2008. this letter obtained by wjz is typical of what hundreds of patients received. it tells the patients quote >> reporter: did anyone ever tell you how blocked your arteries were before they put any of the stints in? >> no. >> reporter: wjz also obtained other documents showing that an outside peer review group led to the hospital's conclusion that stints were placed in these patients when it may not have been medically necessary. >> they submitted to anesthesia, they had a surgical procedure, they were hospitalized. they missed time from work. they suffered pain. all of that was unnecessary. >> reporter: this baltimore woman is another patient who may have received unnecessary stints. >> i just don't feel comfortable with having two stints in me that should not have been there. >> reporter: cardiologists tell her she never needed the stints and one told her she has been exposed to risks unnecessarily. >> he said the blockage that was there, he would not have put the stints there because