A<unk>  refers to a (usually abnormal)<unk>  of the heart on auscultation. It includes three or four sounds, thus resembling the sounds of a<unk> . The normal heart<unk>  contains two audible heart sounds called S1 and S2 that give the well-known "lub-dub"<unk> ; they are caused by the closing of valves in the heart. The first heart sound (S1) is closure of the valve at the end of ventricular filling (the tricuspid and mitral valves); the second heart sound (S2), is closure of the aortic and/or the pulmonary valves as the ventricles relax. Extra sounds, (third and/or fourth heart sound, can be normal, especially in children, or with severe exercise, but are generally heard (on the left side) when ventricular function is impaired, e.g., in case of acute infarction or severe cardiac failure. The sounds are thought to be caused by the atrium, facing back-pressure, forcing volume into an incompletely emptied ventricle. Then, given tachycardia, a<unk> " is produced. With right-sided back pressure after pulmonary embolism, and therefore an incompletely emptied right ventricle, a right-sided<unk>  can occur.
Gallop rhythm
Bigeminy
Oak wilt
Dichotic pitch
Owl's eye appearance
Growing Pains
Moon face
Grain itch