joining us is dr. samati, and chief of robotics at mount sinai medical center. doctor is here.t by saying, we still have to diet and exercise, but i read the study before the interview. 2700 pages, university of california los angeles medical center and perhaps the findings are irrelevant? >> i'm glad you brought it up. a great study coming from a great center, but it's observational, meaning it doesn't prove anything at this point. let me explain to you exactly what the study is about. 6 million americans suffer from heart failure, and 10% of them have a real advanced heart failure, or historic heart failure, meaning that this pump doesn't really push the blood out and get to the entire system and that's the kind of people we're talking about, and the other 90%, what they looked at was, they saw that people that have obesity, they measure it by body mass index, body mass index by 25 or 30, were overweight or obese, those patients have to heart disease, less complications or less chance of death or chance of getting one of these pumps, left ventricular device. >> jamie: why? >>