title: Reciprocal movement of the right and left heart, demonstrated by directional Doppler ultrasound.
mesh_terms: D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006331:Heart Diseases / Q000175:diagnosis; D006801:Humans; D010701:Phonocardiography; D011187:Posture; D014463:Ultrasonography; D016276:Ventricular Function