I usually post on arthritis and lupus, however I had a question. Does anyone know about sinus bradycardia. My eKG showed this but otherwise is normal. I have been having some chest heaviness, numbness in my palms and dizziness. I do exercise regularly but have been put on Synthroid since my thyroid was removed in Feb. Dose had to be reduced a little. ER doctor suggested an echocardiogram. Any comments or advice would be greatly appreciated.