Objective To analyze the correlations of serum B-type brain natriuretic peptide (BNP) with arterial partial pressure of oxygenpa(O2), high-sensitivity C-reactive protein (hs-CRP), right ventricular end diastolic diameter (RVDD) and death in patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD) and left ventricular ejection function (LVEF) preservation.
Methods The data of 150 AECOPD patients with LVEF preservation were retrospectively analyzed. According to the serum BNP level, they were divided into group A (BNP ≤ 100 pg/mL, n=82), group B (BNP>100 pg/mL to 400 pg/mL, n=45) and group C (BNP>400 pg/mL, n=23). The pa(O2), BNP, hs-CRP and RVDD were compared among the three groups after admission. The correlations of BNP with pa(O2), hs-CRP as well as RVDD were analyzed; predictors of death within 1 year were analyzed by Logistic regression. The 1 year mortality risk ratio (RR) of the 3 groups was analyzed.
Results The pa(O2) in group B and group C was significantly lower than that in group A, and BNP, hs-CRP and RVDD were higher than those in group A (P < 0.05). BNP and hs-CRP in group C were significantly higher than those in group B (P < 0.05). Correlation analysis showed that BNP was negatively correlated with pa(O2) (r=-0.385, P < 0.001), but positively correlated with hs-CRP and RVDD (r=0.664, 0.388, P < 0.001). Within 1 year, the RR and 95%CI of group C with group A and group B were 1.303(1.019 to 1.668) and 1.263(0.978 to 1.630), respectively, and the differences were statistically significant (P < 0.05). BNP was an independent predicting factor for death within 1 year (P < 0.05).
Conclusion The elevated BNP level in AECOPD patients with LVEF preservation is associated with decreased pa(O2) level, increased hs-CRP, and increased RVDD. Serum BNP is a sensitive indicator for assessing the condition of AECOPD and death.
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