Arrhythmias do not always progress. In fact some can cease if they are caused by medications, mold/mycotoxins from a SBS (sick building syndrome) and tick vectors like Lyme and Bartonella. Ceasing certain meds can stop the it, removing one self from the moldy building and detoxing can eliminate arrhythmias and curing the diseases like Lyme and Bartonella can also stop heart rhythm issues. Other issues like dehydration can cause it."More than 400 drugs are known to increase the QT interval, increasing the risk of arrhythmias. They include some antihistamines, diuretics, antibiotics, antidepressants, cholesterol-lowering and diabetes drugs and even some anti-arrhythmia medications."
https://news.vumc.org/2022/02/24/clue-drug-induced-arrhythmias/
Also hypokalemia with or without induced by diuretic therapy.
My father had a bad GI virus and ended up in the ER. My brother took him in and next thing I hear is from a doctor who wants to put a pacemaker in him. He was just dehydrated. I knew one of the top researchers in heart arrhythmias in the country at the hospital I worked at. (this was well before my problems arose) . I had the ECG faxed to this doctor. This was years before smart phones. Anyhow Galen read his ECG and said my father didn't need a pacemaker. He told me it was caused by dehydration and he had seen the same ECGs in elite athletes that where dehydrated. So I told the doc in Chicago no pacemaker and he was furious yelling at me that "he will be back in the ER again". Of course my father lived another 10 years without any arrhythmias.