title: The role of stress in symptom exacerbation among IBS patients.
abstract: Over 200 treatment-seeking irritable bowel syndrome (IBS) patients completed 4 weeks of daily prospective measures of stress and gastrointestinal symptoms as well as retrospective measures of stress (life events over 12 months, hassles over 1 month). We also obtained the stress measures on 66 nonill controls. Irritable bowel syndrome patients report more frequent hassles than controls and a greater stress impact than controls. Using structural equation modeling, we found that the data were consistent with a model of robust autocorrelation effects of both week-to-week gastrointestinal (GI) symptom indices (r=.84) and stress indices (r=.73), as well as strong concurrent effects of stress on IBS symptoms (r=.90) and vice versa (r=.41). The data also were consistent with a model where there were effects of stress in Week t upon GI symptoms in Week t+1 and t+2, but they were mediated through the concurrent week effects and/or autocorrelation effects. There were no statistically significant independent pathways from stress in Week t to GI symptoms in Week t+1 or t+2. Thus, there is more support for a reciprocal relation between stress and symptoms than there is for a causal relation.
authors.affiliation: Center for Stress and Anxiety Disorders, University at Albany-SUNY, Albany, NY, USA. ceblanchard@earthlink.net
authors.forename: Edward B
authors.initials: EB
authors.lastname: Blanchard
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Lackner
authors.forename: James
authors.initials: J
authors.lastname: Jaccard
authors.forename: Dianna
authors.initials: D
authors.lastname: Rowell
authors.forename: Ann Marie
authors.initials: AM
authors.lastname: Carosella
authors.forename: Catherine
authors.initials: C
authors.lastname: Powell
authors.forename: Kathryn
authors.initials: K
authors.lastname: Sanders
authors.forename: Susan
authors.initials: S
authors.lastname: Krasner
authors.forename: Eric
authors.initials: E
authors.lastname: Kuhn
mesh_terms: D005260:Female; D006801:Humans; D043183:Irritable Bowel Syndrome / Q000175:diagnosis / Q000453:epidemiology* / Q000503:physiopathology*; D008016:Life Change Events; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013315:Stress, Psychological / Q000453:epidemiology* / Q000523:psychology; D011795:Surveys and Questionnaires