Prognosis of patients with Rome IV-defined versus physician-diagnosed irritable bowel syndrome: Longitudinal follow-up study.

INTRODUCTION Little is known about the differences between patients diagnosed with irritable bowel syndrome (IBS) by a physician who meet the Rome IV criteria for IBS and those who do not. We conducted a longitudinal follow-up study examining this. METHODS We collected complete gastrointestinal, extraintestinal, and psychological symptom data from 577 consecutive adult patients with suspected IBS in a single UK gastroenterology clinic. We compared baseline characteristics between patients who met Rome IV criteria for IBS, and those who had IBS according to a physician's diagnosis but who did not meet Rome IV criteria, as well as examining whether meeting Rome IV criteria at baseline influenced evolution of symptoms under therapy. KEY RESULTS Of 455 patients diagnosed with IBS by a physician, 375 (82.4%) met Rome IV criteria and 80 (17.4%) did not. Those who met Rome IV criteria were more likely to report severe symptoms (67.6%, vs. 30.0%, p < 0.001) and that symptoms limited activities ≥50% of the time (63.0%, vs. 37.5%, p < 0.001). Patients with Rome IV IBS were more likely to have abnormal anxiety scores (50.8%, vs. 35.9%, p = 0.007) and higher levels of somatoform symptom-reporting (29.4%, vs. 12.5%, p < 0.001). Despite this, during longitudinal follow-up, there was no significant difference in mean number of appointments required subsequently, or IBS symptom severity. CONCLUSIONS AND INFERENCES Although patients who met the Rome IV criteria had more severe symptoms at baseline and were more likely to exhibit psychological comorbidity, they did not appear to have a worse prognosis than those with physician-diagnosed IBS.