What makes a pacemaker necessary for atrial fibrillation? My husband is in and out of it every few days, weak, intolerant of beta blockers and has high BP

Pacemaker are sometimes placed in people who have atrial fibrillation and need to take meds to stop it, but there heart rate is low. The pacemaker serves to keep the heart rate from going too low, but won’t keep someone out of atrial fib. Medicines called antiarrhhythmics and control of blood pressure will keep patients out of AF.