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Western Journal of Nursing Research
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Hypothalamic—Pituitary— Adrenal Axis Dysregulation in Women With Irritable Bowel Syndrome in Response to Acute Physical Stress

Leah Z. FitzGerald

University of California, Los Angeles, lfitzger{at}sonnet.ucla.edu

Priscilla Kehoe

University of California, Los Angeles

Karabi Sinha

University of California, Los Angeles

Irritable bowel syndrome (IBS) supports the concept of a dysregulated hypothalamic—pituitary—adrenal (HPA) axis. This study investigates the neuroendocrine and psychological responses to the acute physical stress of a lumbar puncture (LP) in women with diarrhea-predominant IBS by assessing central and peripheral HPA activity and affective measures. Blood samples have been collected at baseline and immediately post- and 1 hr following LP from 13 women with IBS and 13 controls. Plasma adrenocorticotropic hormone (ACTH), cortisol, epinephrine, and norepinephrine levels are analyzed. A single measure of cerebrospinal fluid (CSF) concentrations of corticotropin-releasing factor (CRFCSF) and norepinephrine CSF is noted. Affective assessments are used to rate anxiety and depression with the Hospital Anxiety and Depression Scale (HADS) and acute mood state is rated using the Stress Symptom Rating questionnaire (stress, anxiety, anger, arousal). The women with IBS display blunted ACTH and cortisol responses to the LP along with a profile of affective responsiveness suggestive of chronic psychosocial stress, although no CRF CSF differences between groups are observed.

Key Words: irritable bowel syndrome • cortisol • corticotropin-releasing factor • lumbar puncture • HPA axis

Western Journal of Nursing Research, Vol. 31, No. 7, 818-836 (2009)
DOI: 10.1177/0193945909339320
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