Biomedical subjects

Martin Beyer

Publications and source records attributed to Martin Beyer.

12 recordsLinked to original sources

PubMed2006

Transcatheter occlusion of a large intercostal side-branch of left internal mammary artery bypass with detachable platinum coils.

Intercostal branches of the internal mammary artery (IMA) are usually tied off during IMA-bypass surgery. Some side-branches may be missed, however, due to anatomical variants or during minimal invasive procedures with limitation of the surgeon's ability to ligate proximal branches. There are a number of reports in the literature describing interventional closure of side-branches using Gianturco coils. Following embolization or malposition, however, these coils may be extremely difficult to retrieve from coronary arteries. We report about interventional embolization of a IMA side-branch with detachable micro-coils in a patient with symptomatic coronary steal. Detachable coils are safer than Gianturco coils and are an effective method to abolish symptomatic coronary steal due to unligated intercostal branches of the IMA graft.

Cardiac Catheterization↗

PubMed2006

[New perspectives in the primary care of the chronically ill--against the "tyranny of the urgent". Part 1: chronic diseases as a challenge for primary care].

Chronic diseases and multimorbidity are becoming a fundamental challenge for primary care which already requires a very high input of resources. Due to their broad range and continuity, general practices play a major role, but are poorly prepared to succeed in the structured healthcare of chronically ill patients. The reality of care in everyday practice is primarily characterized by the 'tyranny of the urgent', and such a reaction to acute problems leads to noticeable deficits in permanent care. Part one of a two-part article series asks to what extent demographic changes and medical progress are responsible for this development. Meanwhile, a large quantity of empirical evidence indicates that results improve when case management is implemented for chronically ill patients. Though disease management programs are being increasingly established in Germany, many general practices are only poorly prepared for their tangible implementation in everyday routine. The comparison of two case studies shows how the primary care of chronically ill patients might look like in the future. On the basis of both scientific evidence and the globally acknowledged 'Chronic Care Model', part two of the article looks at sustainable strategies and special tools which allow for an adequate care of chronically ill patients in general practice.

Chronic Disease↗

PubMed2006

[New perspectives in the primary care of the chronically ill--against the "tyranny of the urgent". Part 2: The chronic care model und case management as the basis of a forward-looking approach to primary care].

Family medicine remains strongly influenced by reactive medicine ('tyranny of the urgent') and the fragmentation of healthcare associated with it. In the first part of the present article the increasing practical and economic relevance of chronic diseases and multimorbidity were analyzed as a fundamental challenge for primary care and family medicine in particular. Part two describes a forward-looking approach to guidelines and special tools which are able to guide and support future healthcare tasks of general practice. Wagner's Chronic Care Model, which was developed on the basis of numerous controlled studies, integrates empirical results, theoretical ideas and real experience within a comprehensive concept for the treatment of chronic diseases. The model focuses on the'productive interaction' between an active patient and a proactive practice team. The various elements of the model help to better understand healthcare in general practices, for example by establishing reminder and recall systems by means of a structured reorganization, through patient registers, the implementation of consultation hours for chronically ill patients as well as patient training. 'Case management' is essential to the success of structured care. Taking care of patients with major depression as an example, it is demonstrated how case management through practice assistants in general practices enables the individual needs of chronically ill patients to be better taken into account. The professionalism of the practice team with new roles and task sharing as well as the implementation of modern strategies for the care of chronically ill patients provide a new chance and a sharpened profile for general practices of the future.

Case Management↗

PubMed2006

[Effectiveness of German disease management programs--problems of clinical evaluation research in the light of a study protocol].

Since 2002 some of the world's largest disease management programs have been launched in Germany--initially for type II diabetes and coronary heart disease--with approximately 5 million eligible insured persons and (in 2005) 2.04 million registered participants. The programs were not piloted prior to their start, and the prescribed statutory evaluation cannot be expected to result in an effectiveness validation. The article describes the development of a study protocol for a randomized controlled trial. It also discusses methodological problems, in particular the definition of primary target criteria, the guarantee of a 'naturalistic' intensity of intervention, and the creation of a control group during nation-wide implementation. Due to lacking support from the stakeholders the proposed randomized trial could not be implemented. Its design, however, allows the required standards for the program evaluation to be specified.

Delivery of Health Care↗

PubMed2006

[The future is chronic: German primary care and the Chronic Care Model--The comprehensive principles in the proactive treatment of the chronically ill].

BACKGROUND: In Germany, primary healthcare for patients with chronic diseases needs to be improved. Taking the example of depression, congestive heart failure, diabetes and diseases of the musculoskeletal system we analyzed to which extent the 'Chronic Care Model' allows for improvements. METHODS: Diagnosis-specific health assessment; adaptation of the 'Chronic Care Model' to the German healthcare system; peer reviewed discussions of the potentials for improving primary care of the chronically ill. RESULTS/DISCUSSION OF THE HEALTHCARE SITUATION: 1) Diagnosis and therapy of chronic diseases comply insufficiently with the evidence. 2) Patients are too passive and/or receive only little effective support. 3) Treatments are often uncoordinated and fragmented. 4) The follow-up of treatment results is often neglected. 5) Approaches to indicated diseases are promising. CONCLUSIONS: The'Chronic Care Model' could improve chronic care in Germany. Disease Management Programs (DMP) should amend multimorbidity and individual healthcare and/or facilitate implementation in general practice.

Chronic Disease↗

PubMed2005

Case management for the treatment of patients with major depression in general practices--rationale, design and conduct of a cluster randomized controlled trial--PRoMPT (PRimary care Monitoring for depressive Patient's Trial) [ISRCTN66386086]--study protocol.

BACKGROUND: Depression is a disorder with high prevalence in primary health care and a significant burden of illness. The delivery of health care for depression, as well as other chronic illnesses, has been criticized for several reasons and new strategies to address the needs of these illnesses have been advocated. Case management is a patient-centered approach which has shown efficacy in the treatment of depression in highly organized Health Maintenance Organization (HMO) settings and which might also be effective in other, less structured settings. METHODS/DESIGN: PRoMPT (PRimary care Monitoring for depressive Patients Trial) is a cluster randomised controlled trial with General Practice (GP) as the unit of randomisation. The aim of the study is to evaluate a GP applied case-management for patients with major depressive disorder. 70 GPs were randomised either to intervention group or to control group with the control group delivering usual care. Each GP will include 10 patients suffering from major depressive disorder according to the DSM-IV criteria. The intervention group will receive treatment based on standardized guidelines and monthly telephone monitoring from a trained practice nurse. The nurse investigates the patient's status concerning the MDD criteria, his adherence to GPs prescriptions, possible side effects of medication, and treatment goal attainment. The control group receives usual care--including recommended guidelines. Main outcome measure is the cumulative score of the section depressive disorders (PHQ-9) from the German version of the Prime MD Patient Health Questionnaire (PHQ-D). Secondary outcome measures are the Beck-Depression-Inventory, self-reported adherence (adapted from Moriskey) and the SF-36. In addition, data are collected about patients' satisfaction (EUROPEP-tool), medication, health care utilization, comorbidity, suicide attempts and days out of work. The study comprises three assessment times: baseline (T0) , follow-up after 6 months (T1) and follow-up after 12 months (T2). DISCUSSION: Depression is now recognized as a disorder with a high prevalence in primary care but with insufficient treatment response. Case management seems to be a promising intervention which has the potential to bridge the gap of the usually time-limited and fragmented provision of care. Case management has been proven to be effective in several studies but its application in the private general medical practice setting remains unclear.

Adult↗

PubMed2005

Thrombospondin 1 as possible key factor in the hemocompatibility of endocoronary prostheses.

Intracoronary stenting has markedly improved the patency of native coronary arteries after percutaneous transluminal coronary angioplasty (PTCA). Advances in stent technology and design, including drug releasing stents, have contributed to reduce the long-term restenosis rate. However, stenosis caused by neointimal hyperplasia, vascular remodeling and thrombosis is still a major problem after endocoronary stent procedures. This study focuses on differential gene expression of circulating peripheral blood cells after 90 min exposure to stents to search for initially activated cellular pathways, which may foster restenosis. Fresh human whole blood (1 IU heparin/ml), taken from non-medicated healthy volunteers, was incubated under flow conditions in an in vitro closed-loop stent-testing model (modified Chandler-Loop). Differential gene expression compared to resting conditions and to the experimental controls was investigated by a DNA-microarray technique encoding for over 17,000 genes simultaneously. As expected, a large variety of genes showed differential gene expression. Interestingly, Thrombospondin 1 (TSP-1), which plays a key role in initial immune defense, was found to be the most markedly up-regulated gene. We propose TSP-1 expression as an early indicator for the activation of immune responses following intracoronary stenting. After clarifying the participation of TSP-1 in vivo, future studies will therefore focus on TSP-1 as a potential prognostic factor, which may also help to develop and control new surface materials with an improved biocompatibility.

Adult↗

PubMed2005

The CONTENT project: a problem-oriented, episode-based electronic patient record in primary care.

In order to obtain a proper knowledge base in primary care, a form of electronic patient record is needed that takes into account the specific characteristics of the doctor-patient encounter, the patient population, the presentation of diseases and the associated prevalences. However, in real life this has not happened for several reasons. For the most part, existing patient records are determined by invoicing requirements rather than by endeavours to meet the intrinsic needs of primary care. CONTENT (CONTinuous morbidity registration Epidemiologic NeTwork) is an ambitious scientific project in Germany to establish a system for adequate record keeping and analysis in primary care. Based on a classification system designed for the special situation of primary care, a scientific network is being established consisting of participating surgeries, general practitioners, computer scientists and statisticians. The project is supported by the German Federal Ministry of Education and Research. The aims are strictly scientific and the underlying hypothesis is that the knowledge-gaining process can be accelerated by combining the experience of many, especially with respect to complex interactions of factors and the analysis of rare events. Aside from maintaining a morbidity registry, within the CONTENT framework various prospective and retrospective studies on particular epidemiological and health economic research topics will be conducted.

Episode of Care↗

PubMed2004

[Case management for patients with congestive heart failure under ambulatory care--a critical review].

BACKGROUND: Congestive Heart Failure (CHF) is becoming the most serious cardiac health problem after coronary heart disease (CHD). But at present, service offered to CHF patients are flawed because of the fragmentation and discontinuity of care. Case management (CM) takes responsibility for following up patients, for assessing symptoms and taking action when patients do not adhere to guideline based treatment or fail to improve. This review analyses the evidence of primary care based CM for patients with CHF. METHODS: Searches in Medline using relevant MeSH terms and hand-searching were applied to identify relevant studies. We selected RCTs and pre-post studies focussing on patient-centred CM in ambulatory settings. A five-level score (simple to complex) was generated to describe interventions and compare results. RESULTS: 23 of 462 identified studies (16 RCT, 7 others) that fulfilled our selection and quality criteria were included. We classified 15 studies as "complex" CM, i.e. they contained more than three elements of intervention, were strongly integrated with the process of care, involved a specialised nurse, and offered individual patient education. All studies examined the length of hospital stay: costs were investigated in 17, quality of life in 10 and mortality in 7 studies. Studies examining a "complex" CM demonstrated positive effects on mortality and quality of life in the 3-6 months of follow up. Studies with a follow up period of 12 to 18 months showed a reduction of hospital days. CONCLUSION: Especially "complex" models of CM for patients with CHF can be effective in a primary care setting. CM can prevent the fragmentation and discontinuity of care by strengthening a close contact between patient and health care provider.

Ambulatory Care↗

PubMed2004

[An assessment of patient education programmes for patients with type 1 and 2 diabetes, asthma and COPD, coronary heart disease, hypertension, congestive heart failure, and breast cancer in Germany].

BACKGROUND: Patient education programmes will be a mandatory part of the new legislation on disease management programmes for chronic diseases in Germany. Today, only little is known about the number, variety and effectiveness of implemented patient education programmes in Germany. METHODS: 176 potential providers of patient education programmes were identified by literature search, Internet search, and interviews with health education experts. We developed a semi-structured questionnaire. Assessment of content and quality was conducted in two steps by using defined criteria of the Co-ordinating Committee, the Head Association of the statutory health insurances and the respective Medical Associations: the first step was to check whether the programme had a structured teaching concept and whether all requirements for education with respect to a given disease had been taken into account. In the second step, we used balance sheets for reviewing the strengths and weaknesses of the programmes. RESULTS: 49 providers handed in 95 pa tient education programmes for assess ment. Due to formal mistakes only 91 programmes could be analysed. 49 programmes failed the criteria of the first assessment step. For the remaining 42 patient education programmes balance sheets were prepared. Areas of the most frequent deficiencies included: lack of scientific evaluation of the effectiveness of the programme, lack of transparency of cost data, and quality improvement activities. CONCLUSIONS: For the purpose of a nation-wide implementation of disease management programmes the existing patient education programmes in Germany need to be further improved. Single examples demonstrated that the accessible criteria of self-management are not sufficient for the evaluation of already established patient education programmes.

Asthma↗

PubMed2003

[Evaluation of disease management programs--current deficits, demands and methods].

The evaluation of disease management programmes is necessary and has been made obligatory in Germany by the Fifth Book of Social Code. So far there has been extensive ambiguity as regards the precise definition of suitable strategies for the evaluation. Considering the scientific evaluation of the diabetes contract in North-Rhine current deficits of the evaluation of already existing programmes for chronically ill patients are exemplarily described. On the basis of international experience reasonable demands are discussed that ought to be accomplished when evaluating the effectiveness and benefit of the programmes. Taking the British Medical Research Council as an example, a four-step model will be suggested as a loophole in the methodological dilemma of varying suitable study designs, which allows for the adequate evaluation of even complex interventions.

Disease Management↗

PubMed2002

Astrocyte-induced T cell elimination is CD95 ligand dependent.

The brain has an intrinsic capacity to remove infiltrating T cells by inducing apoptosis. However, the pathways and cellular components driving this process are still under debate. Astrocytes seem to play an important role because they colocalize with apoptotic lymphocytes in vivo and induce apoptosis of transformed T cells in vitro. Since we previously demonstrated the expression of the death ligand CD95L (APO-1L/FasL) on astrocytes in the brain, we wanted to know whether nontransformed astrocytes induce cell death in nontransformed T cells, reflecting the in vivo situation and, if so, whether CD95/CD95 ligand interaction is important. T cell apoptosis measured by Annexin V binding and DNA fragmentation was significantly lower using CD95 ligand-deficient (gld) astrocytes compared to nondeficient controls. Moreover, neutralizing anti-CD95 ligand antibody reduced astrocyte-induced T cell apoptosis. Thus, adult astrocytes are capable of inducing the apoptotic death of T cells by involving the CD95/CD95 ligand pathway without undergoing cell death in vitro. Since astrocytic end-feet contribute to the formation of the blood-brain barrier, this depletion mechanism may play an important role as the first line of defense in the brain.

Animals↗