Gwen M C Masclee

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BACKGROUND & AIMS Concomitant use of nonsteroidal anti-inflammatory drugs (NSAIDs) and low-dose aspirin increases the risk of upper gastrointestinal bleeding (UGIB). Guidelines suggest avoiding certain drug combinations, yet little is known about the magnitude of their interactions. We estimated the risk of UGIB during concomitant use of nonselective(More)
OBJECTIVES Non-steroidal anti-inflammatory drugs (NSAIDs), proton pump inhibitors (PPIs), low-dose aspirin and statins may decrease the risk of oesophageal adenocarcinoma (OAC) among patients with Barrett's oesophagus (BO). However, previous studies did not adequately address bias and confounding. Our objective was to estimate the risk of OAC among patients(More)
OBJECTIVES:Microscopic colitis (MC) is characterized by chronic watery diarrhea. Recently, several drugs were reported to increase the risk of MC. However, studies lacked a clear exposure definition, did not address duration relationships, and did not take important biases into account. We estimated the risk of MC during drug use.METHODS:This is a(More)
BACKGROUND Although Clostridium difficile may be associated with exacerbations in inflammatory bowel diseases (IBD), prospective studies identifying the role of C. difficile in disease activity are currently lacking. We examined the prevalence of C. difficile in feces of (1) symptomatic IBD patients retrospectively and (2) consecutive outpatients in(More)
Proton pump inhibitors (PPIs) are among the most commonly used drugs worldwide, and their intake increases with age. Despite a relatively safe profile, a range of studies have reported associations between use of PPIs and various adverse events. The most important adverse events, such as pneumonia, bone fractures, bacterial enteric infections, and(More)
BACKGROUND Two strategies for prevention of upper gastrointestinal (UGI) events for nonselective nonsteroidal anti-inflammatory drug (nsNSAID) users are replacement of the nsNSAID by a cyclo-oxygenase-2-selective inhibitor (coxib) or co-prescription of a gastroprotective agent (GPA). AIM To identify whether and in whom either of these strategies should be(More)
OBJECTIVE To evaluate the accuracy of disease codes and free text in identifying upper gastrointestinal bleeding (UGIB) from electronic health-care records (EHRs). STUDY DESIGN AND SETTING We conducted a validation study in four European electronic health-care record (EHR) databases such as Integrated Primary Care Information (IPCI), Health Search/CSD(More)
BACKGROUND Gastroprotective strategies are recommended for nonsteroidal anti-inflammatory drug (NSAID) users at risk of upper gastrointestinal (UGI) complications. AIM To compare the use of gastroprotective strategies in NSAID users in three countries, and the subsequent impact of rofecoxib withdrawal. METHODS We conducted a population-based cohort(More)
BACKGROUND While the role of bacteria as an etiological factor triggering relapse in inflammatory bowel disease (IBD) has been studied extensively, little is known of the role of enteric viruses. We aimed to prospectively study the prevalence and risk factors for common enteropathogenic viruses in IBD patients in relation to disease activity. METHODS IBD(More)
BACKGROUND Patients with irritable bowel syndrome (IBS) seen by a gastroenterologist often utilize medications that may alter intestinal homeostasis. The question arises whether exposure to these drugs is associated with the development of IBS symptoms. Aim of this study was therefore to assess the use of PPIs and NSAIDs in patients with IBS versus(More)