Frederik Riedel

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We investigated in patients with chronic venous insufficiency (CVI) and after compression therapy the fluxmotion within characteristic frequency bands, which were described earlier by Bracic 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(More)
Photoplethysmography (PPG) is a non-invasive, inexpensive and unobtrusive method to achieve heart rate monitoring during physical exercises. Motion artifacts during exercise challenge the heart rate estimation from wrist-type PPG signals. This paper presents a methodology to overcome these limitation by incorporating acceleration information. The proposed(More)
  • F Riedel
  • 1987
In order to evaluate long term effects of artificial ventilation, 27 children, who had been ventilated for more than five days in their neonatal period, were reinvestigated at school age. In 5 of them bronchopulmonary dysplasia had been diagnosed. Seven had more than 10 upper respiratory tract infections per year and 9 had recurrent obstructive airway(More)
In 87 premature infants of an neonatal intensive care unit (gestational age 28-37 weeks) serum-T4, -fT4 and TSH were investigated on day 10, 20 and 30 and at term respectively, in addition to the usual TSH-screening (capillary specimen) on day 5. In 47 neonates (54%) T4 and fT4 were found to be low, including all infants under 30 weeks of gestational age(More)
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