recently had a ablation for svt oct 29 since then i have had heart flutters, chest pain at times and my left leg has bothered me, had an venous ultrasound and xray yesterday, results not in yet, i wore a holter monitor 24hr 2 weeks ago, i have a echo on dec 22, on my results from my holter monitor it said i had sinus rhythum low voltage inprecordial leads abnormal what does this mean