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Table 2 Correlation (Chi-square values) between BNP, TUS and amount of fluids in the first 24 h

From: Thoracic ultrasound evaluation and B-type natriuretic peptide value in elective cesarean section under spinal anesthesia

 TUSBNP at time 0BNP at 24 hFluids > 1000 mL
TUS 0.22 (df = 1; p = 0.64)0.48 (df = 1; p = 0.49)0.87 (df = 1; p = 0.35)
BNP at time 00.22 (df = 1; p = 0.64) 4.09 (df = 1; p = 0.04)0.87 (df = 1; p = 0.35)
BNP at 24 h0.48 (df = 1; p = 0.49)4.09 (df = 1; p = 0.04) 0.54 (df = 1; p = 0.46)
Fluids > 1000 mL0.87 (df = 1; p = 0.35)0.87 (df = 1; p = 0.35)0.54 (df = 1; p = 0.46) 
  1. TUS thoracic ultrasound, BNP brain natriuretic peptide