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Relationships among the lactulose breath test, intestinal gas volume, and gastrointestinal symptoms in patients with irritable bowel syndrome.

 Young Hoon Youn  ;  Jung Soo Park  ;  Sang In Lee  ;  Hyojin Park  ;  Mark Pimentel  ;  Jie-Hyun Kim  ;  Hyun Chul Lim  ;  Jae Hoon Jahng 
 Digestive Diseases and Sciences, Vol.56(7) : 2059-2066, 2011 
Journal Title
 Digestive Diseases and Sciences 
Issue Date
BACKGROUND AND AIMS: Irritable bowel syndrome (IBS) patients frequently complain of gas-related symptoms, and the lactulose breath test (LBT) is a test that assesses the amount of fermented gas generated by bacteria in the bowel. We aimed to assess the relationship among intestinal gas volume, LBT result, and gastrointestinal symptom score in healthy control and functional bowel disorder (FBD) subjects. METHOD: In 84 IBS subjects, 24 FBD subjects other than IBS, and 25 healthy controls, a symptom questionnaire that enquired about seven main symptoms, plain abdominal radiography and a LBT were checked on the same day. The intestinal gas volume was calculated as the gas volume score (GVS) with a digitalized image of plain supine abdominal radiographs. RESULTS: The GVS was greater in the LBT (+) group compared to the LBT (-) group (P = 0.02). The GVS was greater in the FBD and IBS groups than in the control group (P < 0.01). The GVS showed low but positive correlations with the severity and frequency of bloating, flatulence, abdominal pain, constipation, and tenesmus (P < 0.05). The severity of flatulence (P = 0.02) and the frequency of bloating (P = 0.02) in the LBT (+) group were significantly higher than those in the LBT (-) group. CONCLUSIONS: Subjects with positive LBT had more gas-related symptoms and greater gas volume scores. Gas-related symptoms, positive LBT and increased GVS were significantly associated to each other. These findings can broaden the understanding of the pathophysiologic mechanisms of gas-related symptoms in IBS.
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1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실)
Yonsei Authors
김지현(Kim, Ji Hyun) ; 박효진(Park, Hyo Jin) ; 윤영훈(Youn, Young Hoon) ; 이상인(Lee, Sang In) ; 임현철(Lim, Hyun Chul) ; 장재훈(Jahng, Jae Hoon)
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