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Puls wave analysis

E J Meijer, K H M Hermans, A Zwanenburg, W Jennekens, H J Niemarkt, P J M Cluitmans, C van Pul, P F F Wijn, P Andriessen
OBJECTIVE: To quantify the neuronal connectivity in preterm infants between homologous channels of both hemispheres. METHODS: EEG coherence analysis was performed on serial EEG recordings collected from preterm infants with normal neurological follow-up. The coherence spectrum was divided in frequency bands: δnewborn(0-2 Hz), θnewborn(2-6 Hz), αnewborn(6-13 Hz), βnewborn(13-30 Hz). Coherence values were evaluated as a function of gestational age (GA) and postnatal maturation...
November 2014: European Journal of Paediatric Neurology: EJPN
Hendrik J Niemarkt, Ward Jennekens, Jaco W Pasman, Titia Katgert, Carola Van Pul, Antonio W D Gavilanes, Boris W Kramer, Luc J Zimmermann, Sidarto Bambang Oetomo, Peter Andriessen
Our study aimed at automated power spectral analysis of the EEG in preterm infants to identify changes of spectral measures with maturation. Weekly (10-20 montage) 4-h EEG recordings were performed in 18 preterm infants with GA <32 wk and normal neurological follow-up at 2 y, resulting in 79 recordings studied from 27(+4) to 36(+3) wk of postmenstrual age (PMA, GA + postnatal age). Automated spectral analysis was performed on 4-h EEG recordings. The frequency spectrum was divided in delta 1 (0.5-1 Hz), delta 2 (1-4 Hz), theta (4-8 Hz), alpha (8-13 Hz), and beta (13-30 Hz) band...
November 2011: Pediatric Research
M Gutberlet, S Venz, A Kahl, T Ehrenstein, R Puls, N Hosten, U Frei, R Felix
PURPOSE: Aim of this study was to evaluate whether phase contrast MR angiography (PC-MRA) could provide additional functional information besides morphology in the assessment of haemodialysis fistulae. MATERIAL AND METHOD: Twenty-two patients (11 male, 11 female), aged 22-77 years, were examined. MR images were obtained with a 1.5 T Gyroscan ACS-NT (Philips, Best, Netherlands) using a high-resolution wrap-around coil. In addition to MRA blood-flow measurements were performed with a gradient-echo sequence (TR 14 ms, TE 5-5...
August 1998: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
R J Puls, K W Heizer
The general deterioration of the arterial system is well recognized but not easily measured. Leg pulse waves, generated by the electric impedance plethysmograph, would seem to be a promising method. This study is a mathematical analysis of these pulse waves from the legs. The data were taken from a previous study by the same authors. That study analyzed the pulse waves using a frequency analysis (Fourier) and a lumped component model of the circulatory system. Blood pressure became clinically very meaningful when a number could be assigned to it...
March 1996: Medical Hypotheses
E E Hatziandreu, K Carlson, A G Mulley, M C Weinstein
We performed a cost-effectiveness analysis to examine the relative efficacy and costs of percutaneous ultrasonic lithotripsy (PUL), extracorporeal shock-wave lithotripsy (ESWL), and surgery for the treatment of upper urinary tract stones. We developed a Markov model with 35 states, cycles of 3 months, and a time frame of 5 years. Probability estimates were derived from a meta-analysis of the published literature. For stones less than or equal to 2 cm, ESWL is preferred to PUL, since it prevents 2 additional days of morbidity and saves $440...
1990: International Journal of Technology Assessment in Health Care
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