AIM:To study the impact of an endoscopy-based long-term study on the quality of life in healthy volunteers(HV).METHODS:Ten HV were included into a long-term prospective endoscopy-based placebo-controlled trial with 15 endoscopic examinations per person in 5 different drug phases.Participants completed short form-36(SF-36) and visual analog scale-based questionnaires(VAS) for different abdominal symptoms at days 0,7 and 14 of each drug phase.Analyses wereperformed according to short-and long-term changes and compared to the control group.RESULTS:All HV completed the study with duration of more than 6 mo.Initial quality of life score was comparable to a general population.Analyses of the SF-36 questionnaires showed no significant changes in physical,mental and total scores,either in a short-term perspective due to different medications,or to potentially endoscopic procedure-associated long-term cumulative changes.Analogous to SF-36,VAS revealed no significant changes in total scores for pathological abdominal symptoms and remained unchanged over the time course and when compared to the control population.CONCLUSION:This study demonstrates that quality of life in HV is not significantly affected by a longterm endoscopy-based study with multiple endoscopic procedures. AIM: To study the impact of an endoscopy-based long-term study on the quality of life in healthy volunteers (HV). METHODS: Ten HV were included into a long-term prospective endoscopy-based placebo-controlled trial with 15 endoscopic examinations per person in 5 different drug phases. Participants completed short form-36 (SF-36) and visual analog scale-based questionnaires (VAS) for different abdominal symptoms at days 0,7 and 14 of each drug phase. Analyses were performed according to short -and long-term changes and compared to the control group .RESULTS: All HV completed the study with duration of more than 6 mo. Initial quality of life score was comparable to a general population. Analyses of the SF-36 questionnaire showed no significant changes in physical, mental and total scores, either in a short-term perspective due to different medications, or to potentially endoscopic procedure-associated long-term cumulative changes. Analogous to SF-36, VAS revealed no significant changes in total scores for pathological abdominal symptoms and remained unchanged over the time course and when compared to the control population. CONCLUSION: This study demonstrates that quality of life in HV is not significantly affected by a longterm endoscopy-based study with multiple endoscopic procedures.