obturator - During aortic or mitral valve replacement, a sizing tool used to determine the appropriate size heart valve.
obturator flange - That part of the valve sizer, or obturator, that flares outward.
office visit - See pacemaker, check-up.
OPCAB - Off-Pump Coronary Artery Bypass--another term used to describe CABG surgery without use of cardiopulmonary bypass (the heart-lung machine) and done through a traditional median sternotomy incision.
oxygenation system - A perfusion system comprised of an oxygenator and a venous reservoir; may also include a pump.
oxygenator - A device used to remove carbon dioxide from and add oxygen to blood during extracorporeal circulation.
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