The common origin of precordial vibrations

Agress, Clarence M.; Wegner, Stanley; Bleifer, Daniel J.; Lindsey, Alfred W.; Houten, John Van; Schroyer, Kenneth; Estrin, Harley M.

doi:10.1016/0002-9149(64)90177-8

Cited by 14 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A cause-effect relationship between heart dynamics and heart sounds has been demonstrated by mathematical analysis. Through this relation, different authors (Agress et al, 1964;Cassot et al, 1975;Laurens, 1964;van Vollenhoven et al, 1979) were able to demonstrate a linear relation between the phonocardiogram recorded at the chest surface and the left intraventricular pressure tracing. The phonocardiographic signal was shown to be proportional to the acceleration of the outer wall of the heart muscle, and the latter was shown to be proportional to the changes of intraventricular pressure.…”

Section: Amplitude Of the First Heart Soundmentioning

confidence: 86%

Noninvasive index of cardiac contractility during stress testing: A collaborative study

Luisada

Singhal

Portaluppi

et al. 1985

Clinical Cardiology

View full text Add to dashboard Cite

Summary:The present study was conducted in parallel in three different institutions with a similar purpose but using different technical setups. Based on the experimental demonstration that the external phonocardiogram is similar to the rate of acceleration (d3P/d3t) of the left ventricular pressure, and that catecholamines in a similar way i n c m the early positive wave of the left ventricular pressure and the first heart sound (S,) of the external phonocardiogram; knowing that exercise causes secretion of catecholamines and sympathetic reflexes, we have studied the S, changes as a result of exertion in 34 normal young subjects. Blood pressure, heart rate, electrocardiograph, and phonocardiograph recordings of each subject were taken. In 10 subjects, cardiac output was also recorded by impedance cardiography. The result of the study was that the first heart sound incmsed routinely 4-5 times the normal amplitude; in a few subjects the increase was up to 15 times greater. While the extent of increase of s, was proportional to the severity and duration of the effort and was usually proportional to the increase of other parameters, exceptions were noted as having marked increase of S, with moderate increase of either blood pressure or heart rate. This was explained by the different receptors activated by the catecholamines and by the complexity of hormonal and neural influences acting on various organs in a stress test. The amplitude of S, was found to be a reasonably reliable index for following changes of cardiac contractility during exercise, and the suggestion was made that this parameter should be studied in parallel with the others in routine stress tests.

show abstract

Section: Amplitude Of the First Heart Soundmentioning

confidence: 86%

Noninvasive index of cardiac contractility during stress testing: A collaborative study

Luisada

Singhal

Portaluppi

et al. 1985

Clinical Cardiology

View full text Add to dashboard Cite

show abstract

“…This technique, which makes use of a displacement-sensitive transducer placed in the left parasternal area, has been described in previous reports.6) The reliability of this method for the measurement of cardiac events in animals has been established ,7),8) and in the human its advantages over other techniques have been enumerated. 9) In order to test further the validity of this technique for the measurement of ejection time, comparisons were made in 10 subjects between the values of ejection time as obtained by the vibrocardiogram and those measured from a carotid artery tracing. In each subject, comparisons between these values were made at rest and during two levels of exercise.…”

Section: Methodsmentioning

confidence: 99%

Comparison of the Ejection Time-Heart Rate Relationships in Normal and Ischemic Subjects

Agress¹,

Wegner²,

Nakakura³

et al. 1965

Jpn Heart J

Self Cite

View full text Add to dashboard Cite

The ejection time-heart rate relationship was examined in athletes, sedentary normal, and coronary insufficient subjects undergoing treadmill, bicycle ergometer and 2-step exercise tests. Linear regression analyses were performed relating ejection time to heart rate. Changes in ejection time to changes in heart rate from rest to exercise were also examined.No differences of significance were demonstrated between the subject groups or the type of exercise performed even though the coronary insufficient patients manifested ischemic S-T segment changes and angina. It was concluded that measurement of ejection time during exercise at any heart rate level is not useful for the detection of ischemic heart disease.

show abstract

“…(41) observed that vibrocardiogram tracings closely re sembled the first derivative of the ventricular pressure pulse; this prompted them to record simultaneously left ventricular pressure, the vibrocardiogram, and the integrated vibrocardiogram along with several other variables. As could be pre cl icted from the shape and timing of the vibrocardiographic tracings, integration of the latter produced a tracing very similar to the left ventricular pressure pulse.…”

Section: Metabolismmentioning

confidence: 99%

Heart

Hawthorne¹

1965

Annu. Rev. Physiol.

View full text Add to dashboard Cite

The common origin of precordial vibrations

Cited by 14 publications

References 20 publications

Noninvasive index of cardiac contractility during stress testing: A collaborative study

Noninvasive index of cardiac contractility during stress testing: A collaborative study

Comparison of the Ejection Time-Heart Rate Relationships in Normal and Ischemic Subjects

Heart

Contact Info

Product

Resources

About