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A regular heart beat? >> you know, we know these energy drinks can produce elevated heart rate, elevated blood pressure, but in this study that you referenced with the m.r.i. that was just presented, it showed the way in which the heart contracts increases. there's increase the strain on the wall of the pumping chamber of the heart and this is in young people, 45 minutes after their first energy drink. jenna: what's the risk of that? >> so we believe that these energy drinks can -- in people predisposed for heart rhythm disorder can precipitate the heart rhythm disorder that can be deadly and ...

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At new york presbyterian hospital, columbian medical school. thank you for being here. i will guess i got some of those basics, some of that explanation wrong. did i get anything -- fuzz that at all? >> you had all the salient points right. a left ventricular assist device, this is an example of the device that mr. cheney has. it's predominantly inside the body with the battery pack exiting through a small drive line that exits the belly. this ventricular assist device is quite small, as you can see, and it's hooked up -- >> is this actual size? >> that is actual size. >> oh, my gosh, that doe...

Dr. stewart is a cardiac surgery at new york presbyterian hospital, columbian medical school. thank you for being here. i will guess i got some of those basics, some of that explanation wrong. did i get anything -- fuzz that at all? >> you had all the salient points right. a left ventricular assist device, this is an example of the device that mr. cheney has. it's predominantly inside the body with the battery pack exiting through a small drive line that exits the belly. this ventricular assist device is quite small, as you can see, and it's hooked up -- >> is this actual size? >> that is actu...