31. :: : Digoxin blocks the atrioventricular node and causes bradycardia & mdash; i . e . negatively chronotropic. 32. The electrical pulses then must pass through an area known as the atrioventricular node, the electrical gatekeeper to the ventricles. 33. Pacemaker cells develop in the primitive atrium and the sinus venosus to form the sinoatrial node and the atrioventricular node respectively. 34. A study also showed that there is also an increased risk of atrioventricular canal in patients who suffer from Noonan syndrome. 35. Together they discovered and described the atrioventricular node " ( AV node, Aschoff-Tawara node " ). 36. This condition, called tachycardia-bradycardia syndrome, is usually caused by sinoatrial node dysfunction or block or atrioventricular block. 37. When considering only the membranous septum, it is also known as the " atrioventricular component of the membranous septum ". 38. They extend throughout the myocardium from the apex of the heart toward the atrioventricular septum and the base of the heart. 39. One notable expression is when it is shown in the development of the outflow system and atrioventricular canal of the developing heart. 40. FAD is normally associated with Marfan syndrome, atrioventricular and semilunar valves due to elastolysis or breakdown and loss of elastic fibers.
