Everything about atrio-ventricular valves: from embryology to observation after surgical correction. Let's talk about: - anatomy and embryonic development of mitral and tricuspid valves, - how we see the valve in echocardiography, - how to assess the severity of stenosis and insufficiency, - when it's time to refer for surgery, - when lifestyle restrictions are needed, - when medication is indicated treatment - what is done in the operating room - what and how to observe after surgery. Consider interesting clinical cases.