Abstract
We investigated in patients with chronic venous insufficiency (CVI) and after compression therapy the fluxmotion within characteristic frequency bands, which were described earlier by Bračič and Stefanovska (Bull. Math. Biol. 60 (1998), 919–935).
Therefore, the frequency spectra of laser Doppler flux data of the 36 patient's legs were compared with 41 legs of healthy subjects. In addition, 14 patients with CVI wore a compression stocking (interface pressure: 25–32 mmHg) or compression bandages and were measured after 4 weeks therapy. Data were analyzed by means of a Wavelet packet transformation (a combination of the Daubechies filter of order 4 and the Haar filter).
We found significant differences between the patients and the healthy subjects in the frequency intervals of myogenic 0.06–0.16 Hz, respiratory 0.16–0.6 Hz and heart activity 0.6–1.6 Hz (p<0.05, Mann–Whitney U test). Furthermore, the main energy peak height in these frequency intervals increased with the severity of venous disease and was highest in patients with venous leg ulceration. Compression therapy had a significant influence in myogenic vessel activity, which has been proved by a positive frequency shift of 20% (p=0.007, one-sided by the exact Wilcoxon test).
In venous disease fluxmotion was increased. Compression therapy over a period of 4 weeks improved myogenic vessel activity.
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