• Yina Wang, Yu Yang, Ping Chen, Yingquan Luo, and Yue Yang.
• Department of Geriatrics, Second Xiangya Hospital, Central South University, Changsha 410011, China. angela780415@163.com
• Zhong Nan Da Xue Xue Bao Yi Xue Ban. 2012 Apr 1;37(4):325-31.

ObjectiveTo investigate the effect of nasal intermittent positive pressure ventilation (NIPPV) on N-terminal pro-brain natriuretic peptide (NT-proBNP) in patients with acute exacerbations of chronic obstructive pulmonary disease (AECOPD) and type II respiratory failure.MethodsForty patients with AECOPD and type II respiratory failure and 40 patients with stable phase chronic obstructive pulmonary disease were randomly assigned into study. Plasma levels of NT-proBNP, arterial blood gas, APACHE II scores, and pulmonary artery pressures were measured. The plasma level of NT-proBNP was compared between the two groups. Effect of NIPPV on NT-proBNP was studied in patients with AECOPD and type II respiratory failure.ResultsThere were negative correlations between NT-proBNP and pH, and between NT-proBNP and PaO2 (r=-0.691,r=-0.704,respectively;P<0.001),positive correlations between NT-proBNP and PaCO2, and between NT-proBNP and APACHE II scores (r=0.774, r=0.810, respectively, P< 0.001), and positive correlation between NT-proBNP and PAP (r=0.965, P<0.001) in all patients. In patients with AECOPD and type II respiratory failure, there were negative correlations between NT-proBNP and pH,and between NT-proBNP and PaO2 (r=-0.636, r=-0.616,respectively; P<0.001); there were positive correlations between NT-proBNP and PaCO2, and between NTproBNP and APACHE II scores (r=0.545, r=0.475, respectively; P=0.001, P=0.002); and there were positive correlation between NT-proBNP and pulmonary artery pressure (r=0.833,P<0.001). The plasma levels of NT-proBNP were significantly higher in patients with AECOPD and type II respiratory failure than in control subjects [(939.60 ± 250.00) pg/mL vs (151.55 ± 111.20) pg/mL;P<0.01]. NIPPV decreased plasma levels of NT-proBNP [(229.15 ± 98.26) pg/mL vs (939.60 ± 250.00) pg/mL; P<0.01] in patients with AECOPD and type II respiratory failure, as well as improved arterial blood gas and APACHE II scores. Although NIPPV appeared to decrease pulmonary artery pressure somewhat between pre-treatment and post-treatment groups, the differences were not statistically significant (P=0.056).ConclusionThe plasma level of NT-proBNP reflects the severity of patients with AECOPD and type II respiratory failure. NIPPV can decrease a patient's splasma level of NT-proBNP, which has clinical value for evaluating the effect of NIPPV.

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