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Biomedical subjects

G Otte

Publications and source records attributed to G Otte.

17 recordsLinked to original sources
PubMed1995

Inter- and intraobserver variation in the interpretation of electromyographic tests.

This study was undertaken with the aim of evaluating inter- and intraobserver variation on the pathophysiological interpretation of individual electromyographic (EMG) tests on muscles and nerve segments. Seven physicians from 6 European EMG laboratories independently interpreted 81 EMG studies comprising 735 muscle tests and 726 tests on nerve segments. Pathophysiological conclusions were inferred from findings of these tests without considering clinical information. For most combinations of findings, both the inter- and intraobserver variations on the interpretation were low, suggesting that common criteria for pathophysiological interpretations were used and that these were used consistently. For some combinations of findings, however, there was disagreement on whether these indicated specific or unspecific pathophysiological changes. In particular disagreement on whether findings indicated demyelination may be of clinical significance. A large part of the intraobserver variation may be explained by a change towards more cautious interpretations during the study for most of the physicians. It is concluded that there is a need to seek for consensus on the pathophysiological interpretation of individual findings and for incentives to ensure consistency in interpretations. The fact that experienced physicians changed their ways to interpret findings during the study suggests that agreement may be improved globally.

Data Interpretation, Statistical↗
PubMed1995

Quality assurance in clinical neurophysiology: the ESTEEM project example.

This paper describes the current status of the utilisation of clinical practice guidelines (protocols) in the ESTEEM project as one form of the clinical quality assurance procedures considered in the project. The performance of electrodiagnostic studies, in terms of which types of conclusions need to be inferred during the examination plan, is briefly described. The main focus of the paper is a description of an European multicentre clinical audit in the field of Clinical Neurophysiology, using a common data-entry protocol for prospective EMG case collection and assessment with the ultimate objective of building up a multicentre reference database of EMG cases.

Computer Communication Networks↗
PubMed1995

ESTEEM: a European telematic project for quality assurance within clinical neurophysiology.

From the prospective multi-center evaluation study of the decision support system KANDID, significant variations were revealed in local epidemiology, local examination techniques, local preferred examination protocols, and local diagnostic criteria among seven European EMG laboratories. A clinical network of eight Electromyographic (EMG) centers has, due to this study, harmonized terminology and the interpretation of EMG examinations. The ESTEEM project has, based on these specifications, developed the EMG-Platform for the local data acquisition, storage, interpretation, and telecommunication between the clinical ESTEEM centers. On this basis, a medical audit and consensus process across Europe is being carried out on a daily basis. This process has shown an impact on diagnostic criteria within the clinical group. This study has illustrates informatics as a necessary prerequisite for the quality assurance of clinical EMG practice.

Computer Systems↗
PubMed1994

The development of a decision support system for the pathological diagnosis of human cerebral tumours based on a neural network classifier.

This study describes the use of a topological mapping system in the classification of cerebral tumours and the development of a decision support system based upon that classifier. Fourteen pathological parameters from two hundred primary cerebral tumours are presented as vectors to a topological map. The map, consisting of a grid of neurones, learns the features of each tumour by means of a shortest Euclidean distance algorithm, after which self adaptation of the neurons occurs. An LVQ algorithm performs the final classification. Study of the map reveals that it can correctly classify tumors following their malignancy potential and their cytogenesis. The decision support system uses the network at its core and helps not only in reaching a diagnosis but also in finding the optimal way to reach that diagnosis. The usefulness of such a mapping system lies in the field of education, clinical research and medically acceptable cost reduction.

Algorithms↗
PubMed1994

Differences in the handling of the EMG examination at seven European laboratories.

This study was undertaken to analyse epidemiological and methodological differences in referral pattern, examination techniques and distribution of diagnoses among different European EMG laboratories. Seven European EMG laboratories filled in questionnaires and sampled 700 cases retrospectively. The use of needle or surface electrodes for nerve studies and the selection of quantitative techniques for muscle studies exhibited considerable variation. The pattern of referral varied with respect to the type of referral source and the neurological expertise of the referring physician. The proportion of patients without any neurophysiological abnormality ranged from 16 to 33%. The 3 most common diagnostic groups were mononeuropathies, polyneuropathies and radiculopathies although a great inter-laboratory variation was found. The proportion of patients with multiple diagnoses varied from 0 to 23% and most of these diagnoses were from a few known combinations. The presence of an inter-laboratory variation suggests that the quality of the EMG examination may be improved by focussing on the use of techniques, strategies and diagnostic criteria.

Electromyography↗
PubMed1994

ESTEEM (European Standardised Telematic Tool to Evaluate EMG Knowledge-Based Systems and Methods): AIM Project A2010.

ESTEEM is an AIM project which is primarily concerned with how to develop, integrate and clinically test knowledge-based systems for electromyography (EMG) in order to get them generally acceptable, useful and applicable into disseminated clinical routines. A medical workstation entitled the 'EMG-Platform' on which different kinds of application modules including KBSs can be interfaced to a kernel is being developed. Accordingly, an EMG communication protocol is being developed. The ESTEEM consortium is composed of a technical specialist group and a group of clinical experts in EMG from seven European countries. The last group has, besides extensive data collection for building up a multicentre EMG database, agreed on a common EMG terminology and a subsequent general EMG data set specification which covers the informatic needs for describing an EMG examination of different 'EMG schools'.

Electromyography↗
PubMed1993

KANDID--an EMG decision support system--evaluated in a European multicenter trial.

KANDID is an advanced EMG decision support system dedicated to the support of the clinical neurophysiologist during EMG examinations. It has facilities for test planning, automatized and structured data interpretation, EMG diagnosis, explanation, and reporting. In a prospective European multicenter field trial, the agreement levels between clinical neurophysiologists and KANDID's diagnostic statements were measured under ordinary clinical EMG practice. KANDID was assessed in 159 individual patient EMG examinations by nine clinical neurophysiologists at seven different EMG laboratories. The reasoning of KANDID was considered understandable for the examiners in 80-90% of cases. The agreement level for the electrophysiological states of muscles and nerves between KANDID and the individual examiners was, on average, 81%. The corresponding diagnostic agreement with KANDID was, on average, 61%. A pronounced interexaminer variation in the agreement level related to the different EMG centers was observed. All Danish and Belgian examiners agreed with KANDID in more than 50% of their cases with regard to the EMG diagnosis, while the English examiners were in agreement with KANDID in 50% or less of their cases. These differences were possibly due to differences in epidemiology, examination techniques, control material, and examination planning strategies. It is concluded that it is possible to transfer systems like KANDID out of their development sites and apply them successfully if they can be locally customized by the clinical end users via editors.

Decision Making, Computer-Assisted↗
PubMed1987

[The effect of benzydamine on various functions of human granulocytes and their interaction with endothelial cells].

The influence of the non-steroidal antiinflammatory drug benzydamine (Tantum) was studied on several functions of human polymorphonuclear leukocytes, namely their adhesion to endothelial cells, the leukocyte auto-aggregation and their locomotion into cellulose nitrate filters or on glass surfaces. The granulocytes were stimulated either by the synthetic oligopeptide N-formyl-methionyl-leucyl-phenylalanine (FMLP) or the physiologically important complement anaphylatoxins C3a and C5a-desArg. The experiments showed that benzydamine reduces effectively the attachment of granulocytes to endothelium of isolated guinea pig aortic strips (IC50 3-4 X 10(-6) mol/l). This effect seems to be exclusively due to the inhibition of granulocyte adhesiveness and cannot be washed out. Benzydamine also diminishes leukocyte aggregation induced by either the complement peptides C3a, C5a-desArg or FMLP, and in addition causes deaggregation of already formed leukocyte aggregates. However, benzydamine is inhibitory only at 1-3 X 10(-4) mol/l. Likewise, C5a-desArg-induced leukotaxis and phagocyte polarization on glass surfaces as well as spontaneous migration of unstimulated granulocytes in Boyden chambers are decreased only at 10(-4) mol/l. By contrast, benzydamine usually augments chemotaxis in Boyden chambers induced by concentration gradients of the stimuli. This effect might be explained by the prevention of the known auto-oxidative inhibition of phagocytes exerted by benzydamine. Regarding the therapeutic significance, inhibition of the leukocyte-endothelial interaction appears to be of considerable pharmacologic relevance to explain the antiphlogistic properties of benzydamine in vivo.

Animals↗
PubMed1980

The target phenomenon in tenotomized rat gastrocnemius muscle. A comparative electrophysiological and morphological study.

In ten female rats electrophysiological recordings and subsequent histological and histochemical examinations were performed at different time intervals and in different parts of the gastrocnemius muscle, following tenotomy and following combined tenotomy and neurotomy. Repetitive motor action potentials were more easily evoked during the period and at the sites of occurrence, of target fibres in tenotomized gastrocnemius muscle with an intact nerve supply. Both phenomena, the electrophysiological as well as the morphological one, were strongly inhibited by the simultaneous neurotomy. This study suggested that the target phenomenon is a morphological expression of an increased irritability of the muscle, following tenotomy.

Achilles Tendon↗
PubMed1979

[Diagnosis and differential diagnosis of acute hematogenous osteomyelitis in infants (author's transl)].

Clinical and laboratory data are frequently unspecific in acute hematogenous osteomyelitis of infants. As prognosis is dependent on early treatment, a timely radiologic diagnosis is mandatory. Because of specialties in the vascular supply, the roentgenmorphologic alterations of acute hematogenous osteomyelitis in infants differ from the appearance of the disease in other age groups. The acute osteomyelitis in infants frequently leads to destruction of the epiphysis and purulent joint effusion. A subtle analysis of soft tissue lesions will already rise suspicion for acute hematogenous osteomyelitis before destructive or reactive osseous alterations prove the diagnosis by roentgenology. Nuclear medicine examinations of the bone have contributed significantly to radiologic diagnosis of acute hematogenous osteomyelitis in infants despite of few negative results. Osseous trauma and other diseases should be included in differential diagnosis. Especially in neonatals and premature infants, variations in the typical course and appearance of the disease may occur.

Acute Disease↗
PubMed1979

Comparative study of the clinical effect of vincamine versus papaverine given parenterally in the acute phase of stroke.

The efficacy of the "oxygenator", vincamine was assessed in comparison to a classic vasodilator, papaverine, after parenteral administration during the first days of an acute thrombo-embolic stroke. All 263 patients admitted to this open trial had a thrombo-embolism of the A. carotis or one of its cerebral branches within the previous 24 h. Patients demonstrating minimal neurological deficit or requiring admission to an intensive care unit, or patients with a suspected hemorrhagic syndrome were excluded. Each patient received i.v. infusions (15 mg X 6) of 6 vials of vincamine per 24 h, or 6 vials of papaverine (40 mg X 6) per 24 h, occasionally in combination with acetylsalicylic acid (ASA), dipyridamol and hydrocortisone. An initial 3-h control was followed by regular surveillance for 5 days, paying special regard to consciousness and motricity. The administration of vincamine alone had a significantly more favourable effect than papaverine alone on consciousness (p less than 0.001). Furthermore, vincamine associated with other drugs was significantly superior (p less than 0.01) to papaverine given in association. A similar tendency was noted for motor recuperation after vincamine compared to papaverine (p less than 0.001). Vincamine and papaverine were well tolerated during the 5-days observation period, only one side effect after vincamine and four after papaverine being noted.

Adult↗
PubMed1977

Ultrastructural study of a muscle biopsy from a patient with subacute myelo-optic neuropathy.

A man, aged 46, who had been taking Clioquinol in high doses for a long period, developed a characteristic neurological syndrome of subacute myelo-optic neuropathy rather abruptly. Electron microscopical examination of the muscle biopsy, obtained five months after the onset of the disease, revealed severe degenerative changes of the presynaptic nerve endings and some unique paracrystalline inclusions in the sole plate region. The latter may represent the morphological expression of the toxic agent which is held responsible for the subacute myelo-optic neuropathy.

Clioquinol↗
PubMed1976

Papova virus-like particles in a nigral type of Creutzfeldt-Jakob disease.

In this case of Cruetzfeldt-Jakob disease cortical biopsy demonstrated a large number of papova virus-like particles in the axons, dendrites, astroyctic processes and blood-vessel walls, while necropsy findings disclosed a striking status spongiosus and neuronal degeneration in the substantia nigra. The patient also suffered from a testicular feminization syndrome and was treated with immunosuppressive drugs for pemphigus vulgaris. The ready demonstration of viral particles, the rapid course of the disease and the unusual necropsy findings are discussed and related to the pre-existing diseases of the patient.

Cerebral Cortex↗