Volume 22, Issue 12 pp. 2330-2337

Plasma and gastric mucosal 5-hydroxytryptamine concentrations following cold water intake in patients with diarrhea-predominant irritable bowel syndrome

Xiu Li Zuo

Xiu Li Zuo

Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China and

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Yan Qing Li

Corresponding Author

Yan Qing Li

Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China and

Professor Yan Qing Li, Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan 250012, China. Email: [email protected]Search for more papers by this author
Xiao Zhong Yang

Xiao Zhong Yang

Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China and

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Min Guo

Min Guo

Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China and

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Yu Ting Guo

Yu Ting Guo

Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China and

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Xue Feng Lu

Xue Feng Lu

Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China and

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Jun Man Li

Jun Man Li

Department of Gastroenterology, Qilu Hospital, Shandong University, Jinan, China and

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Paul V Desmond

Paul V Desmond

Department of Gastroenterology, St Vincent's Hospital, Melbourne, Victoria, Australia

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First published: 19 November 2007
Citations: 11

Abstract

Background and Aim: The purpose of the present paper was to investigate the effects of cold water intake on 5-hydroxytryptamine (5-HT) and its metabolite 5-hydroxyindole acetic acid (5-HIAA) in diarrhea-predominant irritable bowel syndrome (d-IBS) patients, and to observe the relationship between 5-HT and symptomatology.

Methods: The plasma 5-HT/5-HIAA concentrations at 0, 30 min, 60 min, 90 min, 120 min, 150 min and 180 min following cold or warm water intake were investigated in 32 female subjects with d-IBS and 21 healthy female subjects. Gastric mucosal 5-HT under fasting conditions and following water intake were further investigated in 15 d-IBS patients and nine healthy subjects. Symptomatology was assessed throughout the study.

Results: The plasma 5-HT concentrations in IBS patients were significantly higher than those of controls at 30 min (P = 0.022), 60 min (P < 0.001), 90 min (P < 0.001), 120 min (P < 0.001) and 150 min (P = 0.001) after cold water intake. The peak plasma 5-HT/5-HIAA and area under the curve for 5-HT/5-HIAA were also higher in d-IBS patients (P < 0.001). Gastric mucosal 5-HT in d-IBS patients and controls did not show any significant differences both under fasting condition (P = 0.596) and after cold water intake (P = 0.426). Last, the d-IBS patients with symptoms had higher 5-HT concentration (P < 0.001) and there was a positive correlation (r = 0.714, P = 0.001)between the symptomatology and plasma 5-HT level.

Conclusions: These data suggest that symptomatology following cold water intake may be associated with increased plasma 5-HT concentrations in female subjects with d-IBS.

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