According to "Dr. Google," ablation is also done to correct electrical issues, but a pacemaker corrects both Afib/Aflutter and AV block. It also says that, in some severe cases, they're both used. It says ablation actually can cure issues by "stopping chaotic electrical signals from spreading." A pacemaker doesn't cure underlying arrhythmias but is best for severe heart block (which I have). I just learned a bunch!