Title :
Interaction between respiration and beat-by-beat ventricular parameters from acoustic quantification
Author :
Caiani, EG ; Turiel, M. ; Muzzupappa, S. ; Colombo, Luigi ; Gandini, A. ; Porta, A. ; Baselli, G. ; Cerutti, S.
Author_Institution :
Dipartimento di Bioingegneria, Politecnico di Milano, Italy
Abstract :
In 8 patients with cardiac dilative myopathy and pseudo-normalized mitral Doppler pattern (DP, age 60±2, mean±SE), and in 11 age-matched control subjects (NL, age 61±4), beat-by-beat end diastolic (EDV), end systolic (ESV), stroke (SV) ventricular volume (VV) measurements were obtained at rest for periods of at least 4 min by echocardiographic acoustic quantification (AQ) signal. RR intervals and respiration were recorded as well. In all subjects, spectral analysis showed a prevalence of high frequency (HF) components in all VV series, with an increased absolute power in DP (53±12 ml2 of HF SV variability compared to 16±5 in NL). Folded scatter diagrams of the VV values vs the respiratory phase revealed consistent patterns. Parameters of a linear prediction model of SV were estimated by considering as inputs:1) three samples of respiration; 2) the previous sample of EDV slow trends, 3) the previous RR interval with a goodness of fit of 47±4% in NL and 43±6% in DP
Keywords :
Doppler measurement; acoustic signal processing; biocontrol; cardiovascular system; echocardiography; electrocardiography; lung; medical signal processing; pneumodynamics; spectral analysis; 57 to 65 y; 58 to 62 y; RR intervals; acoustic quantification; age-matched control subjects; at rest; beat-by-beat end diastolic; beat-by-beat ventricular parameters; cardiac dilative myopathy; consistent patterns; echocardiographic acoustic quantification; end systolic; folded scatter diagrams; high frequency components; increased absolute power; linear prediction model; pseudo-normalized mitral Doppler pattern; respiration; respiratory phase; spectral analysis; stroke ventricular volume; Acoustic imaging; Acoustic measurements; Acoustic scattering; Cardiology; Frequency; Hafnium; Predictive models; Spectral analysis; Ultrasonic imaging; Volume measurement;
Conference_Titel :
Computers in Cardiology 2000
Conference_Location :
Cambridge, MA
Print_ISBN :
0-7803-6557-7
DOI :
10.1109/CIC.2000.898452