NCIt related terms : Heart Valve Regurgitation; Unspecified Valve Regurgitation;
NCIt definition : Regurgitation of the blood of the heart valves owning to imperfect closing, insufficiency
or incompetency of the valves.;
Alternative definition : FDA: Problem associated with the escape or backward flow of blood relative to a valve
where it is not specified or not confirmed whether the leak is transvalvular/intravalvular
or paravalvular/perivalvular.;