Vibrations of Low Frequency over the Precordium

Johnston, Franklin D.; Overy, Donald C.

doi:10.1161/01.cir.3.4.579

Cited by 36 publications

(4 citation statements)

References 12 publications

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“…These are divisible into two main types: the first records rela tive displacement of a localized area of the chest wall in relation to the surrounding chest wall (Johnston andOvery, 1951: Luisuda andMagri, 1952;Benchimol, Dimond and Carson, 1961): the second records absolute displacement in relation to a fixed point in space (Dressier, 1987: Eddleman, Willis, Reeves and Harrison, 1953: Beilin and Mounsey. 1962.…”

Section: Methods Of Recording the Impulsementioning

confidence: 99%

The Impulse Cardiogram and the Phonocardiogram

Mounsey¹

1966

Cardiology

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Section: Methods Of Recording the Impulsementioning

confidence: 99%

The Impulse Cardiogram and the Phonocardiogram

Mounsey¹

1966

Cardiology

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“…Measurement of cardiac vibrations was performed as early as the start of the 20th century [ 7 ]. Many variations within this approach, such as vibrocardiography (VCG), kinetocardiography (KCG), ballistocardiography (BCG), cardiokymography (CKG), and apexcardiography have been described [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Time-Frequency Distribution of Seismocardiographic Signals: A Comparative Study

Taebi

Mansy

2017

Bioengineering

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Accurate estimation of seismocardiographic (SCG) signal features can help successful signal characterization and classification in health and disease. This may lead to new methods for diagnosing and monitoring heart function. Time-frequency distributions (TFD) were often used to estimate the spectrotemporal signal features. In this study, the performance of different TFDs (e.g., short-time Fourier transform (STFT), polynomial chirplet transform (PCT), and continuous wavelet transform (CWT) with different mother functions) was assessed using simulated signals, and then utilized to analyze actual SCGs. The instantaneous frequency (IF) was determined from TFD and the error in estimating IF was calculated for simulated signals. Results suggested that the lowest IF error depended on the TFD and the test signal. STFT had lower error than CWT methods for most test signals. For a simulated SCG, Morlet CWT more accurately estimated IF than other CWTs, but Morlet did not provide noticeable advantages over STFT or PCT. PCT had the most consistently accurate IF estimations and appeared more suited for estimating IF of actual SCG signals. PCT analysis showed that actual SCGs from eight healthy subjects had multiple spectral peaks at 9.20 ± 0.48, 25.84 ± 0.77, 50.71 ± 1.83 Hz (mean ± SEM). These may prove useful features for SCG characterization and classification.

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“…THE KINETOCARDIOGRAM II 4. Type I occurred in 78 per cent of the subjects and appeared to be a mixture of type II and type III records.…”

mentioning

confidence: 94%

The Kinetocardiogram

Eddleman¹,

Willis²,

Christianson³

et al. 1953

Circulation

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An analysis of the patterns and amplitudes of the precordial movements is presented. Normal young adult subjects had three types movements. However, some method is necessary to refer the reader to specific movements, and, as the genesis of all the waves is not known, a system has. been adapted that refers to times in the cardiac cycle the waves occur, instead of to their origin. Both the peaks and the valleys of waves have been named, to avoid the confusion that is now present in the ballistocardiographic literature. (Some authors refer to the J wave as indicating the entire headward movement which follows the footward I wave, while others refer to the J wave as the headward and footward movement that occurs above a central base line.) The letters employed are the initials of the times in the cardiac cycle the movements occur, while the subnumerals refer to the various points during that period. Odd numerals have been applied to the valleys, while even numerals have been applied to the peaks. Therefore, an odd subnumber to an even subnumber (i.e., E2-E3) indicates an outward movement, while an even subnumber to an odd (i.e., El-E2) indicates an inward movement. Il, I2, I3, and I4 are points that occur during the phase of isometric contraction. Actually, this time period includes the phase of protosystole, as discussed in the previous communication, or from the onset of QRS of the electrocardiogram to the onset of carotid ejection. The sharp outward movement I1-I2 always occurs after the onset of the QRS complex, and is present in records obtained during heart block and auricular fibrillation, indicating that this outward movement is the result of ventricular activity and, therefore, should not be included in the auricular period. The point I4 usually occurs before, but may occasionally be simultaneous with, the onset of carotid ejection. Therefore, this point was included with isometric contraction. As points I3 and I4 are not present in the right side of the chest (KV3R, KV1), I2 is, therefore, the last point before ejection, even though I2 on the right Circulation, Volume VIII, September, 1953 by guest on May 9, 2018 http://circ.ahajournals.org/ Downloaded from

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Vibrations of Low Frequency over the Precordium

Cited by 36 publications

References 12 publications

The Impulse Cardiogram and the Phonocardiogram

The Impulse Cardiogram and the Phonocardiogram

Time-Frequency Distribution of Seismocardiographic Signals: A Comparative Study

The Kinetocardiogram

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