title: Lactose intolerance in different types of irritable bowel syndrome in north Indians.
abstract: BACKGROUND
  Twenty-five patients of irritable bowel syndrome (IBS) and 25 normal healthy individuals serving as controls, were studied for lactose intolerance.
  
  
  METHODS
  Hydrogen breath test was used as an investigation after giving 50 g of oral lactose. Clinically, the patients were classified into 3 types of IBS.
  
  
  RESULTS
  Eleven (44%) out of 25 patients belonged to diarrhoeal type of IBS, 7 (28%) of 25 patients to spastic and rest 7 (28%) of 25 patients had features of both types of symptoms. Lactose hydrogen breath test was abnormal in 9 cases (82%) of 11 diarrhoeal type of IBS which was significantly higher (p < 0.02) than controls. However, the difference of abnormal hydrogen breath test between spastic type of IBS and patients with features of both types was not significant as compared to controls.
  
  
  CONCLUSIONS
  These results suggest that patients with diarrhoeal type of IBS have a higher incidence of lactose intolerance as compared to spastic type as well as patients with features of both types.
authors.affiliation: Department of Superspeciality of Gastroenterology, Postgraduate Institute of Medical Education & Research, Chandigarh 160012, India. svrana25@hotmail.com
authors.forename: S V
authors.initials: SV
authors.lastname: Rana
authors.forename: A K
authors.initials: AK
authors.lastname: Mandal
authors.forename: R
authors.initials: R
authors.lastname: Kochhar
authors.forename: R
authors.initials: R
authors.lastname: Katyal
authors.forename: K
authors.initials: K
authors.lastname: Singh
mesh_terms: D001944:Breath Tests / Q000379:methods; D003109:Colonic Diseases, Functional / Q000150:complications / Q000453:epidemiology*; D003967:Diarrhea / Q000209:etiology; D005260:Female; D006801:Humans; D015994:Incidence; D007194:India / Q000453:epidemiology; D007787:Lactose Intolerance / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D008297:Male; D015995:Prevalence