Ballistocardiography

Dock, William; Mandelbaum, Harry; Mandelbaum, Robert

doi:10.1097/00000441-195402000-00036

Cited by 11 publications

(11 citation statements)

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“…In descending order: electrocardiogram, phonocardiogram, ultra-low frequency ballistocardiograph [4, 5, 10-14], Starr’s ballistocardiograph [8], Nickerson’s ballistocardiograph [9], and Dock’s ballistocardiograph [15-19]. …”

Section: Fig (1)mentioning

confidence: 99%

Theory and Developments in an Unobtrusive Cardiovascular System Representation: Ballistocardiography

Pinheiro¹,

Postolache²,

Girão³

2010

TOBEJ

139

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Due to recent technological improvements, namely in the field of piezoelectric sensors, ballistocardiography – an almost forgotten physiological measurement – is now being object of a renewed scientific interest.Transcending the initial purposes of its development, ballistocardiography has revealed itself to be a useful informative signal about the cardiovascular system status, since it is a non-intrusive technique which is able to assess the body’s vibrations due to its cardiac, and respiratory physiological signatures.Apart from representing the outcome of the electrical stimulus to the myocardium – which may be obtained by electrocardiography – the ballistocardiograph has additional advantages, as it can be embedded in objects of common use, such as a bed or a chair. Moreover, it enables measurements without the presence of medical staff, factor which avoids the stress caused by medical examinations and reduces the patient’s involuntary psychophysiological responses.Given these attributes, and the crescent number of systems developed in recent years, it is therefore pertinent to revise all the information available on the ballistocardiogram’s physiological interpretation, its typical waveform information, its features and distortions, as well as the state of the art in device implementations.

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Section: Fig (1)mentioning

confidence: 99%

Theory and Developments in an Unobtrusive Cardiovascular System Representation: Ballistocardiography

Pinheiro¹,

Postolache²,

Girão³

2010

TOBEJ

139

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“…The received signal is mixed with the transmit signal and the double frequency term is filtered out to yield s(t), which is the output of the radar. Let the time varying phase be Ø(t)= f3 sin(2,rfmt) (5) f3 corresponds to the maximum phase change in radians that the object moves through and can effectively be considered the modulation index as in wide-band FM. s(t)= -i--(cos 0(t) cos asin 0(t) sin a) (4) For simplicity, let the constant C = ABa.…”

Section: Heart Information In the Radar Outputmentioning

confidence: 99%

“…The ability to use the ballistocardiogram for the detection of various pathological cardiac conditions has been shown extensively in reference [5]. Since the radarcardiogram is simply another form of displacement cardiography, it is expected that the radarcardiogram will yield similar diagnoses.…”

Section: Using the Rcg To Detect Heart Diseasementioning

confidence: 99%

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<title>Applications of neural networks to the radarcardiogram (RCG)</title>

Geisheimer

Greneker

1999

SPIE Proceedings

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Displacement cardiography techniques such as the ballistocardiogram and seismocardiogram use accelerometers to measure body motion caused by the beating heart. The radarcardiogram (RCG) measures this motion using highly sensitive radar developed at the Georgia Tech Research Institute. Combining the portability and non-invasiveness of radar along with neural network processing techniques opens a host of potential new applications including unknown person identification, stress measurement, and medical diagnosis.Correlation between displacement cardiography and the RCG will be discussed along with preliminary research using RCG data and a neural network to identify unknown persons. It was found that a neural network could accurately identify the RCG of an unknown individual out of a small pool of training data. In addition, the system was able to correctly reject individuals not within the training set.

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“…These elongating stresses are accentuated about the greater cur vature of bends and How dividers and adjacent walls at branching sites, where the pulse wave is accentuated by the direct impact of the central red cell mass, the velocity profile being skewed at such sites. The energy involved in pulse pressure wave transmission can be appreciated by its palpability, oscillations of a crossed leg and the shaking of a steel bed in ballistocardiography associated with a water hammer pulse [14], Velocity, amplitude and rapidity of stress application increase with passage of the wave peripherally and with age, hypertension, aortic valvular incompetence and left to right vascular shunts. The effects are potentiated by connective tissue disorders associated with premature vascular fragility in addition to those derived from bend ing, twisting and stretching of arteries occasioned by body motion and postural changes.…”

Section: Bioengineering Fatiguementioning

confidence: 99%

Mechanisms Underlying Arterial Fragility and the Complications of Atherosclerosis

Stehbens

1997

Pathobiology

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The etiology of atherosclerosis must explain the development of primary pathological complications (intimal tears, ectasia, tortuosity, aneurysms and stenoses). They are interrelated and associated with destruction of mural architecture and concomitant loss of tensile strength (fragility) attributable to bioengineering fatigue. The complications become manifested clinically by ischemia, hemorrhage and pressure effects developing with greater frequency in association with hypertension, arteriovenous shunts or connective tissue disorders. Moreover they are produced experimentally and iatrogenically by hemodynamic means but are unexplained by other current etiological hypotheses.

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Ballistocardiography

Cited by 11 publications

References 0 publications

Theory and Developments in an Unobtrusive Cardiovascular System Representation: Ballistocardiography

Theory and Developments in an Unobtrusive Cardiovascular System Representation: Ballistocardiography

<title>Applications of neural networks to the radarcardiogram (RCG)</title>

Mechanisms Underlying Arterial Fragility and the Complications of Atherosclerosis

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