Spondyloarthritis (SpA) is a heterogeneous group of rheumatic diseases, characterized by sacroiliac-joint inflammation (sacroiliitis), peripheral and extra-articular complaints. The lack of... Show moreSpondyloarthritis (SpA) is a heterogeneous group of rheumatic diseases, characterized by sacroiliac-joint inflammation (sacroiliitis), peripheral and extra-articular complaints. The lack of diagnostic criteria makes diagnosing SpA challenging, yet, classification criteria are available. We tested the performance (sensitivity, specificity) of various classification criteria; the recently developed Assessment of SpondyloArthritis international Society (ASAS) criteria outperformed all other criteria. We investigated the discrepancies in interpretation MRIs and conventional radiographs on the presence of sacroiliitis; agreement on radiographic sacroiliitis between different readers is only moderate, but agreement regarding sacroiliitis on MRI is substantial. Rheumatologists take into account all clinical and laboratory results in addition to the imaging results in the diagnostic process. The diagnostic Berlin algorithm - in which all relevant results are taken into account __ can assist rheumatologists. We proposed a modification of this algorithm, which is accepted by ASAS and also included in the recently published guidelines for the diagnosis and treatment of SpA by the Dutch Society for Rheumatology. Besides, we performed systematic literature reviews, forming the base for the update of the ASAS management recommendations. With these results, SpA-patients can be recognized earlier, offering better treatment options and better outcomes. However, further improvements of care for SpA-patients are necessary. Show less
Since a decade, Clostridium difficile infection (CDI) has increased progressively in incidence and severity of disease. Currently, CDI is considered the leading cause of nosocomial diarrhoea,... Show moreSince a decade, Clostridium difficile infection (CDI) has increased progressively in incidence and severity of disease. Currently, CDI is considered the leading cause of nosocomial diarrhoea, associated with an increased duration of hospitalization, healthcare expenses, morbidity and mortality. This thesis describes our findings with outbreak control, diagnosis, identification of specific risk factors and treatment of CDI after the discovery of the emergence of C. difficile PCR-ribotype 027 in the Netherlands. The studies illustrate the role of antibiotics in relation to persistence, severeness and spreading of CDI. Antibiotics are shown to be a primary risk factor for the development of (ribotype-specific) CDI and an essential part of the outbreak control measures (__bundle-approach__), namely antibiotic stewardship. The use of antibacterials is a risk for selection of novel endemic C. difficile strains in e.g. animals, which introduce an increasing risk of alternative zoonotic transmission routes. Except for very mild CDI, which is clearly induced by usage of specific antibiotics, antibacterial treatment is advised. This thesis reviews the comparative effectiveness of the currently available treatment modalities, thereby providing evidence-based recommendations for CDI remedies. Treatment options include: oral and non-oral antibiotics, toxin-binding resins and polymers, immunotherapy, probiotics, faecal or bacterial intestinal transplantation. Show less
