Greater Fatigue and Reduced Neurocognitive Speed With Symptomatic Crohn's Disease.

Background: While patients with Crohn's disease commonly report fatigue, an association of Crohn's disease with mild neurocognitive impairment has also been suggested. This study investigated the relationship between Crohn's disease activity, fatigue, and neurocognitive functioning.

Methods: In this cross-sectional study, adults with Crohn's disease ( = 25) and healthy controls ( = 26) completed the PROMIS Fatigue 7a form and Multidimensional Fatigue Inventory and neurocognitive testing across 6 domains. Symptomatic and endoscopic remission were assessed with a short Crohn's Disease Activity Index and Simple Endoscopic Score for Crohn's Disease. Linear regression adjusting for age and sex was used to compare fatigue and neurocognition among patients with Crohn's disease versus controls and those with active Crohn's disease versus those in remission.

Results: Compared to controls, adults with Crohn's disease reported greater overall and domain-specific fatigue (general, physical, and mental) ( < .05 for all comparisons). Patients in symptomatic remission had significantly less fatigue ( < .05). No differences were found in neurocognitive accuracy or speed between Crohn's disease and controls. Disease activity was not associated with accuracy on neurocognitive testing; however, patients with symptomatic Crohn's disease had longer correct response times for social cognition and episodic memory compared to asymptomatic patients ( < .05). Endoscopic disease activity was associated with longer correct response times for tasks linked to social cognition, episodic memory, and complex cognition ( < .05). These differences persisted after adjusting for fatigue.

Conclusions: Patients with symptomatic Crohn's disease experience greater fatigue and have slower response times on neurocognitive testing. However, fatigue does not appear to mediate the slower response times.