I've seen dynamic memory work better with other guests though, so it might be either something I'm doing wrong, or a side effect of the File Server role. Either way, I've gotten better results with setting static amounts of RAM on my file/DFS servers.
A biological heart valve is a heart valve recovered from a donor or created from donor tissue. A cadaveric valve comes from a human donor. Bovine valves are recovered from cows and porcine valves come from pigs.
LVAD means Left Ventricular Assist Device. An LVAD is a surgically implanted mechanical device that helps the heart pump blood. In other words, they are heart pumps or heart assist devices.. If both your heart's pumping chambers are failing, 2 heart pumps may be used, one for each ventricle. The last few years have been a bonanza for this kind of technology, so settle in and read all about it.