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At least 19 recordsLinked to original sources
PubMed1979

Ballistocardiography: past, present and future.

In this paper, an analysis is given of the present state of ballistocardiography. It is concluded that several aspects of the method have to be improved before successful application in medicine can follow. These aspects are, for example, (a) physiological backgrounds of the method, and (b) signal analysis of the ballistocardiogram. Recent developments on these items are discussed and some preliminary results are given. Research on ballistocardiography is worthwhile to be continuing, since the method offers good perspectives for application in preventive medicine (early detection of coronary heart disease) and in clinical medicine.

Adult↗
PubMed1978

Non-invasive methods for evaluating the importance of heart rate and atrial activity in cardiac pacing. Results of ballistocardiography and digital plethysmography studies in six patients with heart block.

Ultralow frequency ballistocardiography (UFB) and digital pulse plethysmography (DPP) were performed in six patients with an external artificial pacemaker system. UFB was used mainly to evaluate the force of contraction of the left ventricle (IJ amplitude) and DPP for evaluating relative changes in the peripheral pulse volume. Four patients were studied at 40, 50, 60, 70, 80, 90 and 100 beats/min. There was a significant decrease (p less than 0.001) in LJ and pulse amplitudes when the heart rate increased from 40 to 100 beats/min. A positive correlation between relative IJ and pulse amplitude was observed in all cases studied. In beat-to-beat analysis it was found that the importance of the PR interval for the IJ and pulse amplitudes varied between patients. It is concluded that both UFB and DPP may be of value in clinical practice for evaluating hemodynamics in patients with slow spontaneous heart rate. The methods may be of help in selecting the most effective type of pacemaker for the individual patient.

Aged↗
PubMed1979

Newly built facilities for ballistocardiography at the Polytechnic of Turin.

The role of recent research started in Italy, funded by the National Research Council, is stressed. The newly built Bcg facilities at the Polytechnic of Turin are concisely described. Current experimental research concerns the evaluation of a new type of concave-convex Bcg bed. Results from three healthy male individuals are shown and briefly discussed.

Academic Medical Centers↗
PubMed1979

Direct body ballistocardiography: a 25 year survey. Landmarks in its representation of cardiac dynamics.

The direct body Bcg has been shown to reflect various expressions of the known physiological principles of cardiac dynamics. Emphasis has been placed on the identification and characteristics of the individual segment rather than on gross pattern variability for proper Bcg pattern evaluation. Its sensitivity in the detection of early myocardial infarction with particular attention to its initial HI forces has been described. The significance of the simple Master two-step test (double) in eliciting the amplification or deterioration of these forces as a measure of myocardial integrity has also been emphasized. With this proposed definitive direction, there is call for widely organized attempts to clarify its potential as an important adjuvant in the study of clinical heart disease.

Adult↗
PubMed1979

A simple ballistocardiographic measure (IJ/HI amplitude ratio) in relation to electrocardiographic evidence of ischaemic heart disease.

A series of eighteen monozygotic and thirteen dizygotic twin pairs originally selected in 19=7--1968 because of the presence of symptoms of ischemic heart disease in at least one of the pair members was subjected to after examination including ultra-low frequency ballistocardiography. The ratio between IJ and HI amplitudes in the ballistocardiogram was used as an index of myocardial mechanical function. The IJ/HI ratio had a repeatability coefficient of 0.82 before and/or after psychiatric interview. The mean ratio did not change significantly after psychiatric interview. The measure was demonstrated to be independent of height, weight, age, heart rate and systolic and diastolic blood pressure and negatively correlated with a measure of somatic anxiety. The ratio was highly significantly correlated with electrocardiographic evidence of ischemic heart disease. The IJ/HI ratio showed a better discrimination than qualitative readings according to Starr and furthermore has the advantage of providing a continuous measure. The ratio seemed to be more influenced by the functional state of the myocardium than by genetic factors.

Aged↗
PubMed1977

[Effect of various anti-arrhythmia agents on phase structure of cardiac cycle and ballistocardiograph].

A comparative assessment is presented for the effect of Obsiden, Isoptine, Novocainamide, or Chinidin on the phase structure of the cardiac cycle and on the ballistocardiogramme in 125 patients with arrhythmias of varying forms and genesis. A combined employment of Obsidan or Novocainamide with cardiac glycosides was associated with a worsening of the phase structure of the cardiac cycle; with a similar therapy with Isoptine the poly- and ballistocardiographic data improved significantly. The administration of Isoptine without cardiac glycosides resulted in a distinct impairment of these parameters, although prior to the administration of the drug these patients had no circulatory insufficiency. The observed negative effect of Chinidin upon the indices of poly- and ballistocardiography was substantial following preceeding therapy with Isoptine, and less distinct--following Obsiden treatment.

Anti-Arrhythmia Agents↗
PubMed1977

Hereditary nephritis and the heart.

Eleven cases of hereditary nephritis were studied for cardiac abnormalities by means of ECG and BCG. With the exception of two cases no significant abnormalities were demonstrable, which indicates that this genetically transmitted process generally leaves the heart unaffected. It is thus to be expected that intermittent haemodialysis, as far as the heart is concerned, will be well tolerated by these patients.

Adolescent↗