Atrial fibrillation (part 1 of 3): Who and Why

Dr. James Ong, a Cardiac Electrophysiologist, explains the mechanism of Atrial Fibrillation and how Radiofrequency Ablation can help eliminate AFib.


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  1. I have constant afib? and no insurance Fl Hospital kicked me out while my heart rate was at 30 beats a min.

  2. yes that is bad ,i had a fib and ignored it then got congestive heart failure im 44 years old
    my legs started to swell up with water i lost 45 pounds of water in the hospital in? 4 days,i thought i had the flu and worked months not feeling good/no strenth.go to a cardiologist please……………….

  3. I had the same question and my EP just explained that to me yesterday. When the heart is stressed it releases a hormone that attempts to lower the bodies fluid level which will lower blood pressure and relieve stress on the heart. One of the outcomes of the hormone is that it can cause frequent urination. I asked him the same question…”Why do I have to urinate ever 5 minutes during and attack?”?

  4. Good question. The sources of AF are indeed the areas around the veins, but the atrium itself is the one fibrillating, the result of being “driven” by these sources. Being in AF and going at 300-500 beats/minute is somewhat “toxic” to the atrium, causing something called electrical and mechanical “remodeling,” with replacement of healthy tissues by scars. The atrium sort of loses its tone, becomes baggy, and? gets enlarged. It becomes a vicious cycle.

  5. thanks for the info, I was wondering why afib is commonly? associated with LA enlargenment if pulm vein is to be the cause? Thanks again.

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