hi all i had a st. judes dual lead pacemaker inserted five years ago for occassional second degree heart block picked up incidentally on 48 hour tape investigating symptoms for fast heartbeat. i am waiting for surgery to have pocket revision as pacemaker flipping over (was supposed to have had ths done jan2007 but consultant went on long term sick leave!) i have an appointment to see another specialist in aug. i have a few problems and wondered if anyone had any answers.Basically pain on pacemaker site, and between shoulder blades, and very fast heart rate on standing which resloves after sitting,also episodes of very fast heart rate at other times for no reason. i take very small dose of propanalol which eases symptoms a small amount but not for long but makes me feel awful. i seem some days to have constant fast heart rate. does anyone have any suggestions.also will constant untreated fast heart rate lead to an enlarged heart. thanks for listening feeling fed up at present. .