I have normal/low blood pressure. The beta-blocker I take, metoprolol, has successfully controlled my non-sustained ventricular tachycardia (in addition to the atrial tachycardia and occasional skipped beats). Betablockers and calcium channel blockers are routinely used for some arrythmias. Ablation is an invasive procedure and if you dont need to go that route I think it's better. But each individual case is different.