Comments on ``On‐Line Digital Spectral Analysis''

1972 ◽  
Vol 43 (5) ◽  
pp. 839-840
Author(s):  
J. C. Hoffmann ◽  
B. Lacaze ◽  
P. Csillag
Keyword(s):  
Spectral Analysis ◽  
On Line ◽  
Digital Spectral Analysis

On‐Line Digital Spectral Analysis

1971 ◽  
Vol 42 (11) ◽  
pp. 1657-1663 ◽  
Author(s):  
W. Calvert ◽  
R. A. Greenwald ◽  
K. H. Geissler
Keyword(s):  
Spectral Analysis ◽  
On Line ◽  
Digital Spectral Analysis

Real-time FFT algorithm applied to on-line spectral analysis

1999 ◽  
Vol 18 (4) ◽  
pp. 377-393 ◽  
Author(s):  
Pei-Chen Lo ◽  
Yu-Yun Lee
Keyword(s):  
Spectral Analysis ◽  
Real Time ◽  
On Line

Continuous, on-line, real-time spectral analysis of SAP signals during cardiopulmonary bypass

1995 ◽  
Vol 268 (6) ◽  
pp. H2329-H2335
Author(s):  
M. W. Yang ◽  
T. B. Kuo ◽  
S. M. Lin ◽  
K. H. Chan ◽  
S. H. Chan
Keyword(s):  
Spectral Analysis ◽  
Cardiopulmonary Bypass ◽  
Blood Vessels ◽  
Real Time ◽  
Low Frequency ◽  
Frequency Component ◽  
Very Low Frequency ◽  
Frequency Components ◽  
On Line ◽  
Very High

We communicated the application of continuous, on-line, real-time power spectral analysis of systemic arterial pressure (SAP) signals during cardiopulmonary bypass when the heart was functionally but reversibly disconnected from the blood vessels. Based on observations from 15 cases of successfully completed coronary artery bypass grafting procedures, we found that the very low (0.00-0.08 Hz), low (0.08-0.15 Hz)-, high (0.15-0.25 Hz)-, and very high (0.80-1.60 Hz) frequency components of SAP signals exhibited differential changes before, during, and after cardiopulmonary bypass. In particular, the very low-frequency component, which purportedly represents the contribution of vasomotor activity to SAP, presented only a mild decrease in power during hypothermic cardioplegia. Interestingly, the total peripheral resistance also manifested only a slight reduction during the same period. On the other hand, the low-, high-, and very high frequency components were essentially eliminated. These results unveiled an active role for the blood vessels in the maintenance of SAP during cardiopulmonary bypass, possibly as a result of a maintained vasomotor tone as reflected by the sustained very low frequency component of the SAP signals.

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