Es wurden 74 meningeomoperierte Patienten während postoperativer Beobachtungszeiten von 3 Monaten bis zu 10 Jahren im EEG kontrolliert. 12 dieser Patienten bekamen ein Tumorrezidiv.

Erstens sind neue Begr@e hinzugekommen, zwdtens fehlen in den bisherigen Glossaren mitunter wese~tliche Termini, und Mttcns vermißten wir die Ableitungen der Begrfle aus dem Griechischen und Lateinischen, was das Verständnis für eben Terminus oft grundlegend erleichtert, So werden nicht selten Termini aus Unkenntnis der urspriinglichen Wortbedeutung vMig falsch verweddet Zum Beispiel wird immer wieder einmal der Begriff Episadc angewendet, wo es sich exakt um Pliasen oder Moden handelt. Das wäre bei ausreichenden semantischen Kenntnissen sicher zu vermeiden gewesen. Und die katastrophal fehlerhafte Verwendung des Terminus nltradian für Rhythmen, die eigentlich infraWan sind. et vice versa, hätte sich überhaupt nicht einbürgern können.

The Austrain Society of EEG arose out of a working group of austrian electroencephalographers. A working association was founded on September 11, 1954 at Bad Ischl during their first meeting in time-relation to the congress of austrian and german neurorurgeons. This working association was conforming to law transformed into a regular society on October 12, 1956 by the motion of the three proponents Hoff, Rohracher and Bertha.

New technologies now have increased the scope of clinical applications of the EEG, e.g. anesthesia, intraoperative monitoring, sleep disturbances, and pre-surgical diagnostic of epilepsia. This multidisciplinary EEG-methods still lack the existence of standards defining technical and personal prerequisites. The recommendations presented by the Deutsche Gesellschaft für Klinische Neurophysiologie (Deutsche EEG-Gesellschaft) aim at formulating such proposals for the various fields of applications. In addition it was tried to estimate the effort combined with these examinations in terms of a GOÄ (schedule of fees: physicians) ranking. These estimations by no means are compulsory but instead just give an idea of the effort as judged by commission.

According to our experiences (parietal) sleep spindles often show a periodical appearance. Successive sleep spindles in series have a distance of about four seconds. In 95 % the duration of such series of sleep spindles is not longer than 40 s, so that there appears no more than ten successive periodical sleep spindles.

The evaluation of EEG-patterns is usually accomplished by visual analysis. Nowadays however, even personal computers are fast enough for an efficient pattern recognition of EEG signals. Using sleep spindles and K-complexes as examples, our aim was to demonstrate how patterns can be detected in an EEG signal with a high degree of accuracy. Furthermore, recognition of K-complexes has been improved by applying an additional „adaptive algorithm”, allowing individual adjustments to the signal's form and amplitude.

MR myocardial perfusion imaging (MRMPI) is an established technique for the evaluation of the hemodynamical relevance of coronary artery disease. Perfusion imaging at 3.0 T provides certain advantages compared to 1.5 T. Aim of this study was to evaluate myocardial MR perfusion imaging at 3.0 T.Twelve patients with stable Angina pectoris and known or suspected coronary artery disease were examined at 3.0 T. Myocardial perfusion was assessed using a saturation recovery gradient echo 2D sequence (TR 1.9 ms, TE 1.0 ms, FA 12°) with 0.05 mmol Gd-DTPA per kg body weight at stress during injection of 140 μg adenosine/kg body weight/min and at rest in short axis orientation. Perfusion analysis was based on a least square fit of the signal/time curve (peak signal intensity, slope). Perfusion series were assessed by two independent observers. Reference for the presence of relevant coronary artery stenoses was invasive coronary angiography. Two experienced observers evaluated the coronary angiograms in biplane projections for the presence and grade of stenoses. Results were compared with the MR perfusion analysis.All MR examinations could be safely performed and yielded high image quality. In eight patients stress-induced hypoperfusion was detected (stenosis >70% in coronary angiography). In four patients myocardial hypoperfusion was ruled out (stenosis <70%). The myocardial perfusion reserve index was significantly reduced in hypoperfused myocardium with 1.9 ± 1.6 compared to 2.5 ± 1.6 in regularly perfused myocardium (p < 0.05). In coronary angiography, eight patients were found to suffer from coronary artery disease, whereas in four patients coronary artery disease was ruled out.Our initial results show that MRMPI at 3.0 T provides reliably high-image quality and diagnostic accuracy.

In ailnight sleep recordings usually 12 to 16 channel electroencephalographs are used to record the electrical activity of the brain. A detailed analysis of EEG sleep activity, however, requires the inclusion of at least the 19 electrodes placed according to the international 10-20 system in order to compare the variations of the activities in different brain areas. In addition polygraphic parameters such as ECG, respiration and actogram, to mention just a few, have to be recorded depending on the type of study. Therefore the number of recording channels has to be increased for a complete polygraphic investigation. We developed a 32 channel unit with a personal computer and corresponding hardware interfaces allowing the continuous digitalization of up to 32 bioelectrical signals throughout the whole night (8 hours). The recorded data can be presented graphically and evaluated according to the usual methods such as power spectrum, coherence and periodicity analysis.

Polysomnograms were recorded of twelve patients with acquired immune deficiency syndrom (AIDS) during different stages in an open design. During the first night no hypnotics were administered, during the second night 30 mg flurazepam per os were given. Flurazepam affected mainly the NREM parameters. The times „awake” during the night were reduced, sleep stage 2 showed an increase, and the effective sleep time was also increased. The increase in sleep spindle density was remarkable, however, delta sleep and generation of K-complexes were not affected.

Somnopolygraphic recordings were registered from 29 patients with AIDS, their age ranged from 20 to 55 years (mean: 40,9; median: 44). The patients represent the full range of cerebral disintegration representing the picture of a progressing destruction of physiological sleep organization.

Here we investigated the applicability of a computer-aided video-tracking as a method for evaluating potential deficits of neural information processing in patients with AIDS and those showing only positive HIV-seroreactivity. Video-tracking was accompanied with a simultaneous recording of EEG. Eight HIV-positive asymptomatic volunteers and eight AIDS-patients with cerebral manifestation of the disease participated in the pilot study. Two groups of eight normals each served as a control. Video-tracking performance of the HIV-positive volunteers and AIDS-patients significantly differed (p less than 0.05) from those of the healthy volunteers. Although the AIDS-patients' performance tended to be worse than that of the HIV-group, this difference was not significant. Power spectrum analysis of the EEG-data indicated that the diminished performance of the two test groups (AIDS and HIV-positives), accompanied by an increased spectral power across the entire frequency range measured in the study, could be an expression of an enhanced synchronization in cortical neuronal networks. The synchronization in turn could be a sign of possible organic brain damage resulting from HIV-infection. In conclusion, we suppose that video-tracking measures parameters which may indicate early deficits of information processing in CNS.

15 male AIDS-patients from 26 to 55 years (mean 41.8 +/- 8.5) with various cerebral manifestations had a whole-night-sleep-EEG registration. As control the recordings of 15 age-matched volunteers (26-55 years, mean 41.8 +/- 9.8) were examined. Spectral characteristics of elementary EEG-epochs of 40 s length were computed, and sleep staging was performed visually for these intervals. The spectral power density of eight EEG-derivations (left and right frontopolar, frontal, central and occipital electrodes, reference montage to the ipsilateral Cb) were measured (sampling rate 64(-1) s, spectral resolution .25 Hz, frequency range from .25 to 24 Hz). Interhemispherical coherences of the frontal and occipital derivation pairs, and intrahemispherical fronto-occipital coherences of the left and right hemisphere, were computed. In the patients the frontal power density of NREM sleep showed lower values in the frequency range of 10 to 14 Hz. In central and in occipital derivations the power density between 12.5 and 15 Hz was lower in the patients, but the difference was less accentuated. The spectral power density of REM sleep showed similar characteristics in both groups. The interhemispherical frontal coherence of the whole frequency range below 13 Hz was markedly lower in the patient group. This was true for the NREM sleep, and, slightly less, for the REM sleep, too. The interoccipital spectral coherence was generally slightly lower in the patient group; the difference was most clearly in the 12.5 to 15 Hz range of NREM sleep.

The amount of sleep spindles and K-complexes shows a great interindividual variety of combinations, such as many or few sleep spindles and K-complexes respectively. There seems to be no direct correlation between the amount of sleep spindles and K-complexes intraindividually. In our unselected population - age range between 18 and 77 years - the mean sleep spindle density is at 2.59 ± 1.85/min and the mean K-complex density at 1.96 ± .96/min stage 2.