[Hemorrhages of the upper gastrointestinal tract and nonsteroidal anti-inflammatory drugs: the results of a case-controlled surveillance].

A postmarketing surveillance case-control study was set up and applied in an Italian Hospital network to quantify the risk of upper gastrointestinal bleeding (UGB) and exposure to non steroidal anti-inflammatory drugs (NSAIDs). During the period of study 441 cases of UGB and 1323 controls were recruited. The odds ratios (OR) associated with NSAIDs use were estimated for intake occurring over two different periods of time prior to hospital admission (i.e. during the preceding week and month). A strong association emerged for aspirin intake, both in the week (ORMLR = 11.2; 95% CI 7.8-16.9) and in the month (ORMLR = 6.9; 95% CI 4.6-10.2) preceding hospital admission. [MLR = Multiple logistic regression; CI = Confidence interval]. A significant increase in the risk of UGB and use of diclofenac, phenylpropionic acid derivatives, and indomethacin was also found in the two exposure periods considered, while for piroxicam a significant association was only apparent in the analysis of 1-month exposure. As expected, paracetamol and pyrazolone derivatives were not associated with UGB. This pilot experience has shown the feasibility of setting up a multicenter post-marketing surveillance programme and of establishing a network for drug monitoring within the Italian National Health Service, capable of providing a thorough evaluation of the benefit/risk profile of drugs.