I read your question carefully and I understand your concern. Probably my answer is coming a little late and the procedure has already been done, but I m answering anyway so that perhaps others in the future in your situation may profit. I assume your mother has an atrioventricular block, a type of arrhythmia where impulses are not conducted to the heart ventricles. So there is the risk of there not being enough blood being pumped by the heart during these episodes which can be risky. It is not a question which can be handled with medication, not if is a persisting issue, the available medication can be used only temporarily. Only thing is if she has medication which may favor it they can be withheld but I suppose that has already been considered before by her doctors, it is something pretty basic. So I am afraid a pacemaker is the only alternative left. You shouldn t be too much worried as it is a basic procedure, a really routine one, with little risk involved. I hope to have been of help.