TY - JOUR
T1 - Heart-Sound Processing by Average and Variance Calculation—Physiologic Basic and Clinical Implications
AU - Beyar, Rafael
AU - Levkovitz, Shlomo
AU - Braun, Shimon
AU - Palti, Yoram
PY - 1984
Y1 - 1984
N2 - A new statistical method for heart-sound processing was developed and tested on normal subjects and on patients suffering from various cardiac pathologies. The method is effective in decreasing noise and in separating heart sounds from murmurs, as well as in deriving new physiological parameters. The theory is based on the assumption that heart sounds can be classified into deterministic and nondeterministic sounds. The processing results in a very significant attenuation of strong murmurs, while the deterministic events, such as S1-S4, are only slightly affected. The method includes dividing the heart-sound signal into a set of repetitive signals (ensemble) according to the trigger selected to be the peak of the ECG R-wave. The variability of the time elapsed from the trigger to the evoked sound is defined as the jitter. The average and variance functions are calculated from the ensemble Calculation of the heart-sound jitter from the average and variance functions shows a jitter of 5.5 ms ± 2.6 ms for S1, and 8.2 ms 04121905± 3.3 ms for S2. The jitter, which is an objective parameter of the trigger-response linkage, can be used experimentally to clarify some of the cardiac electromechanical mechanisms, and it may have diagnostic value.
AB - A new statistical method for heart-sound processing was developed and tested on normal subjects and on patients suffering from various cardiac pathologies. The method is effective in decreasing noise and in separating heart sounds from murmurs, as well as in deriving new physiological parameters. The theory is based on the assumption that heart sounds can be classified into deterministic and nondeterministic sounds. The processing results in a very significant attenuation of strong murmurs, while the deterministic events, such as S1-S4, are only slightly affected. The method includes dividing the heart-sound signal into a set of repetitive signals (ensemble) according to the trigger selected to be the peak of the ECG R-wave. The variability of the time elapsed from the trigger to the evoked sound is defined as the jitter. The average and variance functions are calculated from the ensemble Calculation of the heart-sound jitter from the average and variance functions shows a jitter of 5.5 ms ± 2.6 ms for S1, and 8.2 ms 04121905± 3.3 ms for S2. The jitter, which is an objective parameter of the trigger-response linkage, can be used experimentally to clarify some of the cardiac electromechanical mechanisms, and it may have diagnostic value.
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U2 - 10.1109/TBME.1984.325302
DO - 10.1109/TBME.1984.325302
M3 - Article
C2 - 6490035
AN - SCOPUS:0021646086
SN - 0018-9294
VL - BME-31
SP - 591
EP - 596
JO - IEEE Transactions on Biomedical Engineering
JF - IEEE Transactions on Biomedical Engineering
IS - 9
ER -