21. Both chambers are in diastole, the atrioventricular valves are open, and the semilunar valves remain closed. 22. Atrioventricular dissociation and M�bitz type II block were not observed in controls but did occur in athletes ."23. The solution is theoretically simple : Boost the atrioventricular node's blocking power and slow down the ventricles. 24. Four different septal defects exist, with perimembranous most common, outlet, atrioventricular , and muscular less commonly. 25. Used with caution in atrial fibrillation as it has the effect of increasing the atrioventricular ( AV ) conduction. 26. Atrioventricular canal defect may be divided into " partial " or " complete " forms.27. ErbB3 null mouse embryos show severely underdeveloped atrioventricular valves, leading to death at embryonic day 13.5. 28. Next, the atrioventricular valves are identified, with the tricuspid valve slightly more apical than the mitral valve. 29. Endocardial cushion defects are associated with abnormalities of the atrioventricular valves ( the mitral valve and the tricuspid valve ). 30. GATA4 expression during cardiac development has been shown to be essential to proper atrioventricular ( AV ) formation and function.
