Irritable bowel syndrome diagnosed in primary care : Occurrence, treatment and impact on everyday life

Abstract: Background: IBS is the most common functional gastrointestinal disorders and affects approximately 10-20 % of the general population and is widespread in all societies and socio-economic groups. Although the disorder does not have a life-threatening course, it still seriously affects the patients in their everyday life.Aim: The general aims of this thesis were to estimate the occurrence of irritable bowel syndrome in the general population and to achieve a better understanding of present treatment of this disorder and impact on every-day life in those suffering from IBS.Material and methods: The LIPS study comprises two parts. Part I was a retrospective register study where the data collection was based on computerised medical records at three selected Primary Health Care centres in a defined region. Part II was a population based case-control study. The identified IBS cases from part I constitute the cases, while their control groups were randomly selected from the population census register in the same area as the cases. Data in part II were collected by means of a postal questionnaire to cases and controls. The study was conducted in Linköping, a city located in the south-east of Sweden with 135 000 inhabitants.Results: The female IBS patients reported lower influence on planning their work and working hours as well as fewer opportunities to learn new things at their work compared to their controls, even after adjustments in multiple logistic regressions for potential confounders like; mood, sleeping problems and perceived health. The female IBS patients had considerably lower HRQOL in all dimensions compared to their controls, even when compared to male patients. Younger female IBS cases (18-44 years) reported lower mental health on the SF-36 scale than the older IBS female cases (p=0.015). In the multivariate analysis these variables, lack of influence on planning the work, family history of IBS, anxiety and sleeping disturbance displayed an association with being diagnosed with IBS in women. In men, lack of influence on working pace, family history of IBS was associated with an IBS diagnosis.The consultation incidence of IBS in part I was 3.4 (95% CI 3.20-3.70) per 1000 person-years for all IBS cases, among females; the incidence rate was 4.6 per 1000 person-years (95% CI 4.16-4.97) and males; 2.3 per 1000 person-years (95% CI 2.01-2.59). The dominating pharmacological treatment prescribed for abdominal complaints were fibre and bulking laxatives agents as well as acid suppressive drugs. These variables had an independent impact on the probability of a follow-up consultation; diagnosed co-morbidity besides the IBS diagnosis, rectoscopy ordered and laboratory tests ordered.Conclusions: IBS patients identified in primary care are significantly affected in their working-life compared to individuals in the general population. Especially female IBS-patients report lower decision latitude at work and they also appear to have a particularly impaired psychosocial functioning in their every day life and impaired HRQOL. Factors associated with IBS diagnosis among females are anxiety as well as family history of IBS and lack of co-determination at work.The incidence rate of IBS was 3.4 per 1000 person-years which increased with age and with an overrepresentation of females. IBS patients did not appear to be heavy utilisers of primary care and those who attended were treated by their GP without further consultation. The strongest predictors for having a follow-up consultation were diagnosed co-morbidity, rectoscopy and laboratory tests ordered