Roel Bogie

Chapter 8

Surveillance intervals In Table 8.5 results of the surveillance intervals are given. Surveillance intervals have been calculated at patient level, meaning that if only diminutive polyps were found, the surveillance interval is based on optical diagnosis solely, whereas if additional polyps (>5mm) were found, the histology of these non-diminutive polyps determined the surveillance intervals. For the ‘resect and discard’ strategy agreement for the Dutch, European, and American guidelines was 90.6%, 91.2% and 90.9%, respectively. Approximately 6.0% would have received a shorter surveillance interval based on optical diagnosis, while in 2.8% to 3.3% of the cases a longer surveillance interval would have been recommended. A detailed overview of the surveillance intervals for the “resect and discard”and“diagnose and leave in place” strategies using different guidelines is presented in Table 8.6 and Table 8.7 .

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