Change in plasma brain natriuretic peptide and its clinical significance in burn patients after delayed fluid resuscitation of shock

Abstract

To observe the early change in plasma brain natriuretic peptide (BNP) level in burn patients with long delayed fluid resuscitation of burn shock and its clinical significance. Thirty-six burn patients with second and third degree of burn covering 32%-92% total body surface area were enrolled for the study, among them 10 patients were complicated with serious heart failure (heart failure group), and 26 patients rallied from shock after delayed fluid resuscitation without heart failure (stable group). The level of plasma BNP, lactate dehydrogenase (LDH), MB isoenzyme of creatine kinase (CK-MB), and left ventricle ejection fraction (LVEF) were determined at admission and 3 hours after hospitalization, and 24, 48, 72, 168 hours after the injury in both groups with electrochemiluminescence (ECL). Compared with stable group, the plasma BNP level (ng/L) of heart failure group at 3 hours after hospitalization, and 24, 48, 72 hours after the burn injury increased significantly (3 hours after hospitalization: 1 521.38+/-121.11 vs. 391.36+/-63.27, 24 hours after burn: 2 516.86+/-193.25 vs. 360.79+/-146.56, 48 hours after burn: 1 587.76+/-169.23 vs. 398.92+/-77.46, 72 hours after burn: 974.45+/-166.33 vs. 283.43+/-68.15, all P<0.01), the level of LVEF lowered significantly (3 hours after hospitalization : 0.33+/-0.03 vs. 0.58+/-0.09, 24 hours after burn: 0.36+/-0.09 vs. 0.60+/-0.10, 48 hours after burn: 0.35+/-0.08 vs. 0.62+/-0.11, 72 hours after burn: 0.39+/-0.10 vs. 0.64+/-0.10, all P<0.05). The levels of LDH (micromolxs(-1) xL(-1)) in stable group were 2.87+/-0.50 at admission, 3.02+/-0.43 3 hours after hospitalization, 4.02+/-0.87 24 hours after burn, 6.90+/-0.87 48 hours after burn, 3.64+/-0.75 72 hours after burn, 2.67+/-0.45 168 hours after burn while in heart failure group, they were 2.97+/-1.40, 3.84+/-0.37, 4.29+/-0.45, 8.50+/-0.38, 3.84+/-0.62, 2.30+/-0.38, respectively; and CK-MB (U/L) in stable group were 59.12+/-13.75 at admission, 70.39+/-10.72 3 hours after hospitalization, 79.29+/-17.27 24 hours after burn, 67.44+/-12.77 48 hours after burn, 30.28+/-7.13 72 hours after burn, 21.44+/-3.15 168 hours after burn while in heart failure group, they were 65.76+/-16.38, 81.46+/-7.92, 86.43+/-14.19, 72.53+/-11.27, 36.39+/-6.18, 22.85+/-7.26, respectively. No statistically significant difference was found in changes in both LDH and CK-MB between two groups (all P>0.05). Determination of the plasma BNP is a simple and useful method in detecting heart failure during resuscitation of shock after a serious burn injury.