[Calculation of the left ventricular ejection fraction. Comparison between 4 different instruments].
OBJECTIVE
The aim of this study was to analyse the relationship between left ventricular ejection fractions (EF) obtained using four different instruments.


METHODS
Eighty-five EF values were analysed. Gated acquisition was performed with the same gammacamera (SOPHA) using 99mTc-labelled red cells. Each EF was obtained using four processing systems: NXT (SOPHA), Entegra (Gems), Odyssey (Philips) and Esoft (Siemens), always working in automated mode. The paired student's t-test, Spearman correlation and Bland-Altman analysis were used to compare methods, and Deming regression was applied.


RESULTS
Mean values and standard deviations for each program were: NXT: 61 +/- 9; Entegra: 60 +/- 10; Odyssey: 60 +/- 9; Esoft: 60 +/- 10. Although no significant differences were found as a whole and the values were linearly related, the methods are not interchangeable.


CONCLUSIONS
The same program should be used in the follow-up of each patient, which is now easily achievable by means of the DICOM standard.
Puchal Añé
R
R
Servicio de Medicina Nuclear, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, España. rpuchal@csub.scs.es
Guirao Marín
S
S
Domènech Vilardell
A
A
Rodríguez Gassén
A
A
Bajén Lázaro
M T
MT
Ricart Brulles
Y
Y
Murillo Sosa
M
M
Martín-Comín
J
J
D004562:Electrocardiography; D004912:Erythrocytes; D015637:Gated Blood-Pool Imaging / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D019275:Radiopharmaceuticals; D015203:Reproducibility of Results; D012984:Software; D013318:Stroke Volume; D013667:Technetium
D019275:Radiopharmaceuticals; D013667:Technetium