Biomedical subjects
Publications and source records attributed to G Breborowicz.
Data concerning frequency of cesarean section as well as frequency of vaginal delivery after cesarean section in Poznań region in years 1990-1991 were presented. During last years we observed significant increase of spontaneous deliveries after cesarean section. The indications for the previous cesarean section and the outcome of the present pregnancy are discussed.
Examples of cardiotocograms looks like a graph of a sine function were presented. The differentiation of these various patterns was discussed. The most usefull parameters were amplitude and frequency of long-term variability and its relation to the uterine contractions and short-term variability.
The main elements of the computer system used in medical practice are discussed. Typical application possibilities of microcomputers in perinatal medicine are described.
The main computer systems used in perinatal medicine are described, with particular reference to the systems of analysis of perinatal data, analysis of cardiotocogram, obstetric ultrasonogram, assessment of the heart function of the newborn, records of respiratory activity in newborns, and use of computers in parenteral alimentation of newborns.
The authors discuss the foundations of mathematical analysis of fetal electrocardiograms, with particular reference to the obtaining of ECG signal by indirect method, and signal processing.
The principles of mathematical analysis of cardiotocographic records are described, together with the methods of calculation of the baseline, oscillations, short-term and long-term variability, and cardiotocographic analysis in frequency range.
Magnetocardiography, phonocardiography, polycardiography and blood flow analysis based on Doppler phenomenon are described discussing the importance of these methods in fetal monitoring in pregnancy and labour.
The analysis of short-term variability of fetal heart rate in the frequency domain was performed. The fetal activity states (quiescence, trunk rotation, body movements, fetal breathing movements) were taken into account. The differences between the shapes of power spectra in physiological and growth-retarded fetuses were discussed.
A mathematical formula was developed for estimating the effect of membrane edge damage on the membrane permeability measured in vitro. It was assumed that in the chambers compressed against each other with identical force, the membrane edge damage depends on their radius and is characteristic for different tissues. Transport of rubidium and albumin across the human amnion and the rabbit mesentery was measured in two chambers with different active areas and this made it possible to estimate the extent of membrane edge damage.
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