Beta blockers are the first line of defense for PVC and premature beats of any kind and when there are issues with the heart. Beta blockers help to relieve the workload of the heart thus lessening your blood pressure. They may help lessen the amount of pvcs that you experience but even if they don't they seem necessary given that you also have afib. Have you been put on a blood thinner or over the counter baby aspirin? Depending on how active your afib is, blood thinners can help prevent blood clots as you come out of an afib episode.