Atrial fibrillation basics,”Atrial rate is >400bpm but most impulses are blocked at AV node, so rate is between 75-175Causes can be from heart disease, pericarditis, pericardial trauma, pulmonary disease, hyper or hypothyroidism, systemic illness, stress, excessive ETOH, sick sinus syndrome, pheochromocytoma pulse ECG: irregular RR intervals and excessive series of tiny, erratic spikes

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