AV node block
Category B - full version without watermark 720x576 (check terms and conditions at www.teledesign.de) The embed version with watermark is free of charge. In atrial fibrillation the two upper chambers of the heart contract irregularly and rapidly. It arises if electrical signals are not only triggered by the sinus node -- the heart's own pacemaker -- but also from wrong "spark plugs". The heart muscle hasn't got enough time to sufficiently contract due to the mislead stimulation. Less blood and hence less oxygen circulates through the body. One therapeutic approach that could lead to permanent healing is ablation. The region within the heart causing or promoting the arrhythmias is thermally ablated. The ablation destroys the original lesion(s). Now no more abnormal electrical signals reach the upper chamber, and it is again the sinus node alone to determine excitation -- like it was designed by nature. Hence natural heart rhythm is restored. Even if atrial fibrillation isn't completely cured by the ablation, most recurrences can be readily treated with low doses of medication. .