Level of serum NT-proBNP and CI after surgery Time CI (l / min / m2) NT-proBNP (pg / ml) r ± SD Median N1 < 2.4 (n=14) 2589.95 ± 1535 2731.5 - 0.35; > 0.05 ≥ 2.4 (n=93) 729.1 ± 1539.95 255 p < 0.001 N2 < 2.4 (n=11) 8376 ± 8321.13 5370 - 0.516; > 0.05 ≥ 2.4 (n=96) 2472.86 ± 2525.27 1529 p < 0.01 N3 < 2.4 (n=3) 10118 ± 3659.22 10758 - 0.436; > 0.05 ≥ 2.4 (n=104) 3881.8 ± 4428.38 2431 p < 0.05 N4 < 2.4 (n=0) - 0.309; > 0.05 ≥ 2.4 (n=107) 3981.78 ± 4549.03 2430 p N5 < 2.4 (n=0) - 0.289; > 0.05 ≥ 2.4 (n=107) 3457.81 ± 4110.98 2079 p Comment: At the time points of N1, N2, N3, N4, and N5 after surgery, the mean of NT-proBNP level in the group with CI <2.4l / min / m2 was higher than in the group with CI≥2.4l / min / m2 (p-value<0.05).