Data di Pubblicazione:
2003
Citazione:
An echocardiographic approach to the analysis of the variability in cardiac cycle phases / E.G. Caiani, A. Porta, M. Turiel, G. Baselli, S. Cerutti. - In: INTERNATIONAL JOURNAL OF BIOELECTROMAGNETISM. - ISSN 1456-7857. - 5:1(2003), pp. 242-245.
Abstract:
The dynamic time warping approach was applied to the left ventricular (LV) volume signal obtained by echocardiographic Acoustic Quantification technique. It allowed to track on a cycle-by-cycle basis the diastasis onset and end points, necessary to extract reliable measures in time duration of cardiac sub-intervals (rapid filling, RF; diastasis, DS; atrial contraction, AC; diastole, DI; systole, SY). Autoregressive spectral analysis was applied to study low (LF) and high frequency (HF) contributions to total power in these new variability series. A group of 10 normal young (NY, mean±SE, 24±2years) and a group of 10 normal adult (N, 63±2years) subjects were studied. Results showed an increase in SY duration in N (387±11ms) compared to NY (345±8ms). Moreover, a greater variability in the diastolic phase was found in NY (3890±1062ms2 compared to 1662±251ms2 in N), related with a greater variability in the DS phase (3575±991ms2 compared to 1075±260ms2 in N). A prevalent LF rhythm in DS was observed in NY (33±7n.u.), compared to N (21±5n.u.). Spectral analysis applied to these series appears able to give a new insight of HRV, evidencing changes in LF and HF contributions relevant to the different cardiac phases and related with the ageing process.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Time-warping ; LV Function ; Heart Rate Variability ; Autoregressive Spectral Analysis ; Acoustic Quantification
Elenco autori:
E.G. Caiani, A. Porta, M. Turiel, G. Baselli, S. Cerutti
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