An acronym used for Keep Veins Open. It is usually a slang term and not a formal order, although frequently used to communicate in notes. KVO refers to just enough fluids to prevent clots in the catheter, so usually about 10cc/hour (clots form when you have no flow).
A hospital, emergency department, or trauma ward full of gunshot and stabbing victims
Potassium. “the patients K was 5.5.”