Patient's question:
My older aunt lives in a rural area with poor conditions, but the relationship between our two families is very good. However, my older aunt has atrial fibrillation with second-degree atrioventricular block. What is atrial fibrillation with second-degree atrioventricular block?Doctor's answer:
In atrial fibrillation, the irregular atrial rate itself already reaches 350 to 600 bpm, while the atrial fibrillation waves that can be conducted to the ventricles are only about 80 bpm. Most of the atrial fibrillation blocks cannot be transmitted within the atrioventricular node. From this perspective, there must be a third atrioventricular delay during atrial fibrillation, and this phenomenon is physiological—it is an effect that cannot be conducted upwards caused by the hidden conduction of atrial fibrillation waves.