Serial EEG findings in sporadic and iatrogenic Creutzfeldt-Jakob disease.

Objective: To study temporal and spatial development of EEG patterns in sporadic and iatrogenic Creutzfeldt-Jakob disease patients.

Methods: Temporal and spatial development of EEG patterns in 4 patients with sporadic Creutzfeldt-Jakob disease and 2 patients with iatrogenic Creutzfeldt-Jakob disease due to implantation of contaminated brain depth electrodes were investigated. A total of 56 EEGs were analyzed, over time spans ranging from 1272 to 3 days prior to death.

Biotin determination by three different methods: specificity and application to urine and plasma ultrafiltrates of patients with and without disorders in biotin metabolism.

A microbiological, an avidin-binding and a streptavidin-binding method for biotin determination were compared. All three methods detected biotin equally well but they exhibit different specificities for derivatives of biotin. The microbiological assay has the highest specificity and is the method of choice for biotin determination in biotinidase-deficient patients.

Clinical and chronotopographic psychomotor seizure patterns (SEEG study with reference to postoperative results).

In 29 selected patients who underwent stereo-electroencephalographic exploration because of uncontrolled psychomotor epilepsy, 213 seizures were recorded. These seizures were analyzed in 10-second-intervals with respect to the sequence of clinical signs and the electrical chronotopographic patterns. By the aid of a computerized cluster analysis four comparatively distinct localization-patterns were found: a) opercular, b) frontobasal-cingular, c) temporobasal-limbic and d) posterior temporal neocortical.

Creutzfeldt-Jakob disease: patterns of worldwide occurrence and the significance of familial and sporadic clustering.

The worldwide epidemiology of Creutzfeldt-Jakob disease (CJD) is presented from an analysis of 1,435 patients. In the United States, the average annual mortality rate is at least 0.26 deaths per million.