| | Surgeries Operations | Open Heart Surgery What prevents the atrioventricular valve from being pushed into artium when ventricle contracts? Chordae tendinae prevent the valves from being pushed back into the atria when the ventricles contract. Open Heart Surgery - Related Articles Fentanyl Advantages How to Use Organic Heat Pads How to Prepare and Eat Rotten Meat on the Primal Diet How do you check your cervix for ovulation? Calcific Tendonitis & Needling Side Effects What can patients consume before sergery and after? Where is an echograph used?