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- Ziegelasch, Michael, 1966-
(författare)
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Diagnostic and prognostic potential of joint imaging in patients with anti-citrullinated protein antibodies
- 2018
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The introduction of novel therapeutic strategies set new goals for the patients’ outcome, which aims to achieve remission. This goal requires early diagnosis of RA and prompt efficient pharmacotherapy. The introduction of anti-citrullinated protein antibodies (ACPA) two decades ago allowed an earlier RA diagnosis. However, there are indications that ACPA positivity is still associated with higher rates of radiographic damage. As the small joints in hands and feet commonly are the first involved sites of inflammation, the role of different imaging modalities were studied regarding their diagnostic and prognostic impact for assessment of arthritis in RA. Further, ultrasound (US) and radiography were used to study the association between RA-specific antibodies and the occurrence of arthritis and joint damage in systemic lupus erythematosus (SLE).The use of US allows assessment of soft tissue like joint capsules, tendons and bursae. Used for a live scanning, it is easy to detect effusions and edema. Doppler indicates vasoproliferation were inflammation is present. Also, US seems to be more sensitive than radiography to detect minimal structural changes located at bone surfaces. We wanted to investigate whether US findings in a pre-RA stage can predict development of arthritis.Digital X-ray radiogrammetry (DXR) is a technique based on computerized analyses of standard hand radiographs to calculate peripheral bone mineral density (BMD) of the three middle metacarpal bones (DXR-BMD). In order for early treatment decisions, we aimed to study whether changes in DXR-BMD loss after 3 months can predict radiographic damage in early RA.In conclusion, the studies showed that ACPA-positivity is still associated with a higher risk of radiographic damage regardless of early treatment decisions. Therefore, close radiographic monitoring and readiness to intensive treatment is warranted in ACPA-positive patients. This thesis also shows that erosions detected by US in ACPA-positive patients with arthralgia predict development of clinical arthritis. Also, the magnitude of DXR-BMD loss helps identify patients at higher risk for future radiographic damage, and may therefore help to improve early treatment decisions. Finally, US and radiography confirm a higher rate of arthritis and erosions also in SLE patients who are positive for RA-specific antibodies.
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| 2. |
- Kalkan, Almina, 1985-
(författare)
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Diffusion, implementation and consequences of new health technology : The cases of biological drugs for rheumatoid arthritis and the Swedish national guidelines
- 2015
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Improvements in health technology raise hopes for better patient outcomes and a more efficient delivery of health care. However, the processes of diffusion and implementation of new health technology have been shown to be complicated and to pose a number of challenges for the healthcare sector. Many at tempts have been made to influence and manage the introduction and diffusion of health technology. One prominent example is the Swedish nat ional guidelines that aim at influencing both clinical and political decision - making in the health sector.The overall aim of this thesis is to describe and analyze the factors influencing the diffusion and economic consequences of the introduction of a new technology with large variations in use, and to explore the process of implementation of nationally produced guidelines as an instrument for improv ing effectiveness and equity. The empirical focus is kept on the biological drugs (bDMARDs) for rheumatoid arthritis (RA), since they implied a substantial treatment change when they were first int roduced and they are relatively costly; and on the national guidelines for cardiac care, since they were the first nat ional guidelines, hence allowing a long-term perspect ive in the exploration of their implementat ion.Paper I presents a register study that uses data from national and regional registries on healt hcare use and work disability of patients with RA and shows that there was a 32 percent increase in the total fixed cost of RA during 1990-2010, mainly after the introduct ion of bDMARDs. Paper II shows that choosing to initiate treatment with bDMARDs varied substantially among 26 rheumatologists presented with hypothetical patient cases, and that there were also disparities between rheumatologists practicing in the same clinic. Paper III presents data from the Swedish Rheumatology Quality Register covering 4010 patients with RA, and shows that when using multivariate logistic regression to adjust for patient characterist ics, disease activity and t he physician’s local context, physician preference was an import ant predict or for prescription of bDMARDs. Paper IV is a qualitative study about prescribing decisions, showing that a constellat ion of various factors and their interact ion influenced the prescribing decisions according to the 26 interviewed rheumatologists. The factors included the individual rheumatologist ’s experiences and perceptions of t he evidence, the structure of the department including responsibility for costs, peer pressure, political and administrative influences, and participat ion in clinical trials. The patient as an actor emerged as an important factor. Paper V is a longitudinal qualitat ive study exploring the responses among four Swedish county councils to the national guidelines for cardiac care through 155 interviews with politicians, administ rators and clinical managers. The results show that unilateral responses to the national guidelines within the county councils have been rare, but there have been at tempts to compromise and to at tain a balance between multiple constituents. There are examples of local information meetings, the use of the national guidelines in local healthcare programs, and performing audits with the national guidelines as a base. However, performing explicit prioritizat ion as advised in the NGCC is rarely found. Over t ime, however, a more systematic use of the national guidelines has been noted.In conclusion, the diffusion of new health technology is influenced by a wide array of factors both at individual and organizational levels, as well as their interact ion. The diffusion resulted in large economic consequences and unequal access due to variations also at clinical level. Moreover, given that healthcare decision-making is influenced by many different factors, the simple influx of evidence-based guidelines will unlikely result in automat ic implementat ion. At tempts to influence healthcare decisions need to have a systems perspect ive and to account for the interact ion of factors between different actors.
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