I was diagnosed at 66 years old 6 months ago on my last day wearing a heart monitor with svt bpm at 240, started about ten years ago but progressively got worse. I walk 12 miles a day and weight lift 5 days per week. After being prescribed metroprolol my blood pressure dropped to 87/58. I decided to have an ablation because of the adverse effects of the meds. SVT ablations are 90 to 95% effective. Since having that done I've never felt better and in my case I was born with an extra electrical pathway which was eliminated, life is good.