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Biomedical subjects

I Decker

Publications and source records attributed to I Decker.

10 recordsLinked to original sources

[Gender identity disorders as a symptom of psychosis, schizophrenia in particular].

In the Netherlands it has recently become possible for transsexual patients to receive hormonal treatment from the onset of puberty. Until the age of 16, pubertal development can be prevented with luteinizing hormone-releasing hormone (LHRH) agonists. From 16 years of age onwards, gender adjustment can be initiated by administration of hormones of the opposite sex. Surgical treatment can be offered once the patient reaches 18 years of age. Although such treatment will only be initiated with reticence and after a long phase of intense diagnostic screening, the question arises whether a clear differentiation can be made between pure gender identity disorders and secondary transsexual feelings that are part of an ongoing psychopathological development, such as schizophrenia. The potential diagnostic confusion is illustrated by a case history of a male schizophrenic patient. This patient had been treated hormonally for transsexualism for years before acute psychotic decompensation occurred. Neuroleptic treatment of the psychosis rapidly reduced the psychotic symptoms. In retrospect, the patient regards his transsexual period as a 'mistake'. Delusions about one's physical appearance and the urge to drastically change the way one looks appear to be relatively common in patients suffering from schizophrenia.

Adult↗

Implementation of a dynamic platform-independent DICOM-server.

Hospital-wide image and patient data transfer within heterogeneous hard- and software infrastructures can be facilitated by using standardized communication protocols and data formats such as digital imaging and communications in medicine (DICOM). Each DICOM application entity (AE) usually provides a static and fixed set of services according to its functionality. However, certain security concepts, changing demands of medical users, or restricted hardware capabilities may be more easily addressed by applications that dynamically provide variable subsets of DICOM services. In a new approach, an object-oriented DICOM server framework was developed that served as a basis for assembling various DICOM applications. These applications may be set up dynamically to offer variable subsets of services at runtime, similar to "plug-ins". The framework was designed and implemented in Java in order to provide low-cost platform-independent solutions. As an example, a DICOM server was implemented and tested in a clinical application providing access to MR and CT images through a Java/DICOM viewer. Data retrieval was optimized by storing parts of the image acquisition and patient data into a relational database.

Computer Systems↗

Prototype of a JAVA/DICOM image server with integrated findings and data security.

The transfer of medical data within heterogeneous hard- and software infrastructures requires platform-independent standardized protocols and data formats such as DICOM. To avoid costly vendor-specific solutions a DICOM server was implemented in JAVA thereby enabling the data access via internet browser technology. The most important patient and image acquisition information were extracted from the DICOM images and stored into a relational database. For an integrated view patient information such as radiological findings were transferred from the Radiological Information System (RIS) into the data base. Image data were accessed either by a fast preview tool or using a DICOM viewer. Since DICOM does not include inherent data security mechanisms, a second tool allowed the DICOM-conform encryption of DCIOM data for a secure long term storage on CD-R or across unsecure networks.

Computer Security↗

[Dextran 40 or HES 200/0.5? Hemorheology of the long-term treatment of ischemic cerebral attacks].

Haemorheological parameters on long-term treatment of ischaemic stroke were measured in two groups of 12 patients receiving dextran 40 or hydroxyethyl starch (HES 200). Both substances similarly lowered haematocrit and whole-blood viscosity. Dextran produced a clear-cut increase in plasma viscosity and red-cell aggregation. The effects were due to a marked increase in the plasma concentration of dextran caused by an accumulation of large molecules. HES 200 improved plasma viscosity and red-cell aggregation. Since these haemorheological parameters are of special importance for improving a disordered microcirculation as would occur at the margins of the ischaemic lesion, HES 200 would seem to be the appropriate plasma expander in long-term treatment with haemodilution. The differences between dextran 40 and HES 200 become the more marked the higher the volume infused.

Blood Viscosity↗