Source:http://linkedlifedata.com/resource/umls/id/C2004489
NCI: Flow in the opposite direction from normal, as the casting up of undigested food or gas from the stomach, or the backward flowing of blood into the heart, or between the chambers of the heart when a valve is incompetent.,NCI: Flow in the opposite direction from normal, as the casting up of undigested food or gas from the stomach, or the backward flowing of blood into the heart, or between the chambers of the heart when a valve is incompetent.