Title :
Microvascular blood flow fluctuations during tilt table induced syncope
Author :
Censi, F. ; Strano, S. ; Festinese, S. ; Calcagnini, G. ; Cerutti, S.
Author_Institution :
Dept. of Comput. and Syst. Sci., Rome Univ., Italy
Abstract :
The aim of this study is to investigate the changes, in the frequency domain, of microvasculature blood flow (BF) occurring in neurally mediated syncope. We studied 20 patients with history of recurrent syncope and 10 control subjects. Peripheral BF was measured (laser Doppler technique) in the palmar region (PBF) and the manubrium sterni (SBF), together with ECG, respiration activity (RA) and blood pressure (BP), at rest (5 minute) and during 70° head-up tilt test. SBF and PBF appear to be characterized by oscillations around 0.16 Hz (0.15-0.19 Hz), that do not have correspondence in the other cardiovascular variability signals. Mean BF was not significantly altered in tilt negative, control and tilt positive groups (11 patients) during tilt. In the tilt-positive group a decrease of mean PBF and SBF and an increase of the oscillation frequency of PBF and SBF was observed in close proximity to the development of symptoms
Keywords :
Doppler measurement; blood pressure measurement; electrocardiography; frequency-domain analysis; haemodynamics; laser applications in medicine; medical signal processing; pneumodynamics; spectral analysis; 0.15 to 0.19 Hz; 70° head-up tilt test; ECG; at rest; blood pressure; cardiovascular variability signals; control subjects; frequency domain; laser Doppler technique; manubrium sterni; microvascular blood flow fluctuations; neurally mediated syncope; oscillation frequency; oscillations; palmar region; peripheral blood flow; recurrent syncope; respiration activity; symptoms; tilt negative groups; tilt positive groups; tilt table induced syncope; Biomedical computing; Blood flow; Blood pressure; Cardiology; Electrocardiography; Fluctuations; Frequency; Pressure measurement; Sternum; Testing;
Conference_Titel :
Computers in Cardiology 2000
Conference_Location :
Cambridge, MA
Print_ISBN :
0-7803-6557-7
DOI :
10.1109/CIC.2000.898558
