Clinical standardization of the new dual cardiac probe.

A new mobile dual cardiac probe has been introduced for measurements of the left ventricular ejection fraction (LVEF). In 28 patients, correlation between LVEFs measured by the dual probe and biplane contrast ventriculography was 0.83. Central and peripheral injections yielded comparable curves, and the resultant LVEFs correlated well (R = 0.95). Correlation between LFEVs determined by the probe and by gated blood pool imaging in 43 patients was also 0.83. In 21 patients given three serial injections of 99mTc-albumin, the mean variation of the ejection fraction was 4.2 +/- 3.2%; however, reproducibility was unsatisfactory using 99mTc-sulfur colloid due to sequestration in hepatic background tissue.