RESUMO
Obective: We compared the efficacy of gated blood pool [GBP] ventriculography with echocardiography and contrast ventriculography for measurement of left ventricular ejection fraction [LVEF] in patients with myocardial infarction. Gated blood pool ventriculography [invivo technique] and echocardiography were performed in 30 patients at least after 24 hours but within 48 hours of contrast ventriculography. Echocardiographic methods included: [1] Subjective [visual] estimation of LVEF from 2 dimensional [2D] echocardiography. [2] 2D directed M-mode [Cubed method] echocardiography. Single plane cine ventriculographic ejection fractions were calculated using Dot calibration method. The comparison of GBP ventriculographic LVEF with contrast ventriculographic LVEF and 2D echo estimated LVEF revealed no significant difference in their mean ejection fraction [44.04 +/- 11.93 vs 48.46 +/- 12.78% p = NS] and [44.04 +/- 11.93 vs 47.38 +/- 13.06%, p= NS] respectively, while comparison of GBP LVEF with 2D directed M-mode [cubed method] echocardiography revealed highly significant difference in their mean EF [44.04 +/- 11.93 vs 61.7 +/- 15.65%, p < 0.01]. GBP LVEF has statistically significant correlation with contrast ventriculographic [r = 0.86] and 2D echo estimated [r = 0.77] LVEF, while has poor correlation [r = 0.57] with cubed formula from 2D echo. GBP ventriculography can be utilized accurately for determination of ejection fraction in post myocardial infarction patients for diagnostic and prognostic evaluation