My mother in law is 75 years old having a pacemaker installed in her heart. She had to take off her hearing aid device since the cardiologist said the electromagnetic signals will interfere with the working of pacemaker. Can pacemaker and hearing aid both co-exist if the hearing aid battery is kept at a distance of more than 6 inches from the place of pacemaker installed. If yes then which hearing aid to be purchased. Request to reply.