Comparability and reproducibility of apex cardiogram recorded with six different transducer systems.

Willems, Jos L.; Denef, B; Kesteloot, Hugo; Geest, H De

doi:10.1136/hrt.41.6.716

Cited by 4 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When they are recorded with a too short time constant, a phase shift alters the slopes and height [20], and differentiated curves are obtained which secondarily influence their derivatives, i.e., dA/dt. Finally, an apcxcardiographic time constant of 4 s or more is a prerequisite for calibration of the method [21], This remarks also concern the methodological limitations of the investigated parameters in this study.…”

Section: Discussionmentioning

confidence: 99%

Clinical Value of Calibrated and Differentiated Displacement Apexcardiography in Ischemic Heart Disease

Kolev¹,

Romoda

1982

Cardiology

View full text Add to dashboard Cite

The calibrated left apexcardiogram with time constant 4 s and its first derivative (dA/dt) has been evaluated in 62 patients with ischemic heart disease and in 50 normal subjects. The normalized positive peak of dA/dt (max dA/dt/Ad), the peak velocity of contractile element shortening (Vpm), the normalized negative peak of dA/dt (min dA/dt/Ar), and the time constant of myocardial relaxation T as well as the time interval from R wave of the electrocardiogram to the peak positive dA/dt (R-max dA/dt) and the total apexcardiograp-hic relaxation time interval divided to mean arterial pressure (TRI) were measured. In patients with ischemic heart disease we found a decrease of max dA/dt/Ad, Vpm, min dA/dt/Ar and an elongation of T, R-max dA/dt, and TRI, when compared to controls.

show abstract

Section: Discussionmentioning

confidence: 99%

Clinical Value of Calibrated and Differentiated Displacement Apexcardiography in Ischemic Heart Disease

Kolev¹,

Romoda

1982

Cardiology

View full text Add to dashboard Cite

show abstract

Fibre-grating sensors for the measurement of physiological pulsations

et al. 2013

View full text Add to dashboard Cite

Non-invasive assessment of diastolic function in hypertrophic cardiomyopathy on and off beta adrenergic blocking drugs.

Alvares¹,

Goodwin²

1982

Heart

View full text Add to dashboard Cite

SUMMARY Beta adrenergic blocking drugs in hypertrophic cardiomyopathy provide symptomatic relief but their effect on long-term prognosis is uncertain.Thirty patients were studied non-invasively by simultaneous recordings of echocardiogram, apexcardiogram, phonocardiogram, and electrocardiogram in order to assess diastolic abnormalities on and off oral beta adrenergic blocking drugs. While on treatment these patients had a mean dose of propranolol 200 mg/day. The treatment was stopped for one week and then non-invasive assessment was repeated.The following diastolic time intervals were studied: isovolumic relaxation period (A2-mitral valve opening); rapid relaxation period (A2-O point of the apexcardiogram), and the period from mitral valve opening to the 0 point of the apexcardiogram (Mo-0) when most of the filling of the left ventricle occurs. The prolongation of the rapid relaxation period reflects a reduced rate of fall of the left ventricular pressure when the pressure differential does not change between A2 and the 0 point of the apexcardiogram, and in this study this period was prolonged in 19, shortened in eight, and remained the same in three patients after beta blockade. The Mo-O point was prolonged in 22, shortened in seven, and was unchanged in one patient after beta adrenergic blocking drugs. All these results were independent of heart rate.In conclusion the response of diastolic time intervals to beta blocking drugs in hypertrophic cardiomyopathy was variable but there was a significant number of patients in whom the time available for filling of the left ventricle was prolonged, suggesting better filling possibly because of improved distensibility of the left ventricle after beta adrenergic blocking drugs.

show abstract

Comparability and reproducibility of apex cardiogram recorded with six different transducer systems.

Cited by 4 publications

References 16 publications

Clinical Value of Calibrated and Differentiated Displacement Apexcardiography in Ischemic Heart Disease

Clinical Value of Calibrated and Differentiated Displacement Apexcardiography in Ischemic Heart Disease

Fibre-grating sensors for the measurement of physiological pulsations

Non-invasive assessment of diastolic function in hypertrophic cardiomyopathy on and off beta adrenergic blocking drugs.

Contact Info

Product

Resources

About