can blood flow through the heart backwards
Heart valve disorders can arise from two main types of malfunctions: Regurgitation (or leakage of the valve). The valve(s) does not close completely, causing the blood to flow backward through the valve. The heart is forced to pump more blood on the next beat, making it work harder. Stenosis (or narrowing of the valve). The valve(s) opening becomes narrowed, limiting the flow of blood out of the ventricles or atria.