Surveillance of patients with Barretts esophagus after complete eradication of intestinal metaplasia

A 55-year-old Caucasian male with a long history of smoking and reflux disease underwent endoscopic evaluation for dyspepsia. During upper endoscopy, a 4 cm long Barrett's segment with an 8 mm nodular lesion was detected. The lesion was removed en-bloc by endoscopic mucosal resection and biopsies were taken from the adjacent columnar epithelium. The histology of the lesion revealed high-grade dysplasia with clear resection margins and no lymphovascular invasion. The remaining biopsies did not show any dysplastic changes. He subsequently underwent three sequential sessions of radiofrequency ablation (RFA) to eradicate the remaining Barrett's epithelium. When this type of case presents to the clinic for follow-up, what do you do next?