Digitizing and signal averaging of left ventricular pressure signals using a dedicated radionuclide imaging system.
Eur J Nucl Med
; 13(7): 338-42, 1987.
Article
em En
| MEDLINE
| ID: mdl-2828060
ABSTRACT
A method for obtaining left ventricular (LV) volume curves, synchronized with average LV pressure (LVP) curves for calculation of LV contractility, is described. Multiple gated blood pool imaging was performed to calculate average LV volume curves. Simultaneously with this acquisition, LVPs and aortic pressures were measured by indwelling catheters and recorded on an FM tape recorder. These signals were fed to the computer as image information and averaged and processed by the software developed for this purpose. Pressure resolution of the calibrated images was 4 mmHg/pixel when provision was made for a maximum pressure of 200 mmHg. A good correlation (r = 0.99) was obtained between the calculated peak LVPs and mean peak LVPs read from the chart recorder. The regression equation was digitized peak LVP = 1.04 x chart recording--5.11 mmHg and the standard error of the estimate was 2.9 mmHg. Similar results were obtained with the aortic pressure (AP) measurements (digitized AP = 0.94 x chart recording + 6.37 mmHg, the standard error of the estimate was 3.8 mmHg). The digitized data also allowed the construction of pressure-volume loops for interpretation of ventricular contractility.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Volume Sistólico
/
Processamento de Sinais Assistido por Computador
/
Ventrículos do Coração
/
Contração Miocárdica
Limite:
Animals
Idioma:
En
Revista:
Eur J Nucl Med
Ano de publicação:
1987
Tipo de documento:
Article
País de afiliação:
África do Sul