atrioventricular block AE second degree atrioventricular block AE 10003677 an atrioventricular block AE that some but not all atrial impulses fail to reach the ventricles, thus some ventricular beats are dropped. Electrical signals between the atria and ventricles are slowed to a large degree. Some signals don't reach the ventricles. On an EKG, the pattern of QRS waves doesn't follow each P wave as it normally would. SS second degree heart block atrioventricular block second degree WEB: http://www.medilexicon.com/medicaldictionary.php?t=10751 WEB: http://www.nhlbi.nih.gov/health//dci/Diseases/hb/hb_types.html