ScienceDaily (Sep. 23, 2008) — Gallstone disease is very common and costly. Preventive strategies are based on the knowledge of GD risk factors. This study reports the results of a multicenter project aimed at evaluating GD incidence and risk factors. 9611 subjects (5477 males, 4134 females, aged: 30-79 years) were evaluated; 4.4 percent had gallstones, 0.6 percent had been cholecystectomized; incidence rate was 0.67 percent per year. Increasing age and body mass index were identified as true risk factors for GD.

Gallstone disease is a very common gastrointestinal disorder: in fact it has been documented that more than 14% of adults are, or have been, affected by this disease. Therefore, gallstones are a major public health problem, and this disorder is one of the most common and costly of all digestive disease, at least in the Wester World.

In fact in terms of inpatient physician services and hospital costs, gallstone disease is by far the most costly digestive disorder, the bulk of the economic burden is mainly due to the surgery, being cholecystectomy considered the treatment of choice for symptomatic gallstones. However, since the introduction of laparoscopic cholecystectomy into clinical practice at the end of 80s, a possible unjustified increase in surgical procedures has been observed. probably due to changes in the perceived risk-benefit ratio (for patients and physicians) and changes in surgical indications. Therefore, there is the need for more knowledge of the epidemiological characteristics of GD in order to better identify therapeutic strategies.

A new research article addresses this question. The research team led by Prof. Davide Festi of the University of Bologna has performed the second phase of an epidemiological project (the MICOL project) which is a population-based, cross-sectional study carried out in 8 Italian regions by different operative units.

The project plan includes 2 cross-sectional surveys; the first began in 1985 and was completed in 1988 and the second survey was carried out on the same subjects 10 years later in order to estimate the incidence of gallstone disease. Incidence rate was 0.67% per year, higher in females (0.81%) than in males (0.66%) and it increased with age. Since the study protocol was characterized also by a questionnaire inquiring about the clinical manifestation of the disease, it was possible to confirm that pain in the right hypocondrium and/or epigastrium represents the only symptom significantly associated with gallstones, while the so-called "non-specific biliary symptoms", i.e. dyspeptic symptoms, showed the same frequency in gallstone-free subjects and GD patients.

Furthermore, specific symptoms increased in severity and frequency throughout the different stages of gallstone disease (from silent to severe disease). In the studied population, the risk factors for GD in males were increasing age, BMI, concomitant diseases such as diabetes, liver cirrhosis, peptic ulcer and coronary disease, low levels of HDL and total cholesterol, and high levels of triglycerides while, in females, only increasing age and BMI.

Increasing age, pain in the right hypocondrium/epigastrium and the presence of concomitant diseases are predictors of GD. Pain in the right hypocondrium or epigastrium was the only symptom associated with GD; symptom severity increased as a function of the natural history of the disease. Increasing age in men and aging and BMI in females were the only predictive factors for the eventual presence of symptoms.

This study has provided data on the incidence, risk factors and clinical manifestations of gallstone disease on a large free-living population. These results may help physicians in clinical decision making, particularly in choosing between different therapeutic strategies (i.e "wait and see", medical treatment, surgical therapy) and in interfering with the risk factors, in particular those related to an unhealthy life style, such as an increased BMI.

Journal reference:

1. Festi et al. Incidence of gallstone disease in Italy: Results from a multicenter, population-based Italian study (the MICOL project). World Journal of Gastroenterology, 2008; 14 (34): 5282 DOI: 10.3748/wjg.14.5282

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