Data from 2,298 measurements of pulmonary venous admixture (QS/QT) per formed in 733 patients were analyzed and processed in order to develop a method for rapid and reliable estimation of QS/QT by a simplified approach. Formulae and charts were obtained, which are easily suitable for use in all settings, and permit estimation of QS/QT with an 85%-93% control of its varia bility (r2 = 0.85-0.93, p < 0.0001) simply on the basis of the measured arterial and central venous O2 tensions or saturations.
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