B型利钠肽检测在急诊呼吸困难病因鉴别中应用价值的探讨

目的 探讨B型利钠肽(BNP)在急诊呼吸困难病因鉴别中的应用价值.方法 测定155例急诊呼吸困难患者血浆BNP浓度,并与超声心动图左心室射血分数(LVEF)及E/A值进行相关性分析.以不同BNP浓度为临界值,计算其诊断心源性呼吸困难的敏感性及特异性.结果 心源性呼吸困难组BNP浓度(764±275)ng/L]与LVEF及E/A值呈明显负相关,且明显高于非心源性呼吸困难组(113±59)ng/L](P＜0.01).以BNP浓度100、300、500 ng/L为临界值,其诊断心源性呼吸困难的敏感性分别为100.0%、92.2%、80.0%;特异性分别为73.9%、90.8%、100.0%.结论 BNP检测用于急诊呼吸困难病因初步筛查具有重要意义,低水平的BNP临界浓度(＜100 ng/L)有助于排除心源性呼吸困难,高水平的BNP(＞500 ng/L)临界浓度有助于确定心源性呼吸困难,BNP浓度区间100～500 ng/L对于诊断和排除心源性呼吸困难都有一定局限性.

Abstract：

Objective To explore the value of plasma brain natriuretic peptide (BNP)level in differentiating etiology of dyspnea in emergency patients. Methods The plasma BNP levels in 155 emergency patients with dyspnea were assayed. The correlation between BNP levels and left ventricular ejection fraction(LVEF) and E/A respectively. Sensitivity and specificity in differentiating etiology of dyspnea were calculated based on different levels of BNP. Results The BNP levels in cardiogenic dyspnea group were negatively correlated with LVEF and E/A respectively (P ＜ 0.01). They were also significantly higher than those in noncardiogenic dyspnea group (P ＜ 0.01).The sensitivity in diagnosing cardiogenic dyspnea at different critical BNP levels (100 ng/L,300 ng/L,500 ng/L)was 100.0%,92.2%,80.0%,and the specificity was 73.9%,90. 8%,100.0% respectively. Conclusions Plasma BNP level has significant value in preliminarily differentiating etiology of patients with dyspnea. Lower BNP level (＜ 100 ng/L) is helpful in excluding cardiogenic dyspnea and higher BNP level (＞500 ng/L) is helpful in confirming cardiogenic dyspnea. However,BNP level between 100 ～ 500 ng/L isdeficient in confirming and excluding cardiogenic dyspnea.

Plasma brain natriuretic peptide level in differentiating etiology of dyspnea in emergency patients

Objective To explore the value of plasma brain natriuretic peptide (BNP)level in differentiating etiology of dyspnea in emergency patients. Methods The plasma BNP levels in 155 emergency patients with dyspnea were assayed. The correlation between BNP levels and left ventricular ejection fraction(LVEF) and E/A respectively. Sensitivity and specificity in differentiating etiology of dyspnea were calculated based on different levels of BNP. Results The BNP levels in cardiogenic dyspnea group were negatively correlated with LVEF and E/A respectively (P ＜ 0.01). They were also significantly higher than those in noncardiogenic dyspnea group (P ＜ 0.01).The sensitivity in diagnosing cardiogenic dyspnea at different critical BNP levels (100 ng/L,300 ng/L,500 ng/L)was 100.0%,92.2%,80.0%,and the specificity was 73.9%,90. 8%,100.0% respectively. Conclusions Plasma BNP level has significant value in preliminarily differentiating etiology of patients with dyspnea. Lower BNP level (＜ 100 ng/L) is helpful in excluding cardiogenic dyspnea and higher BNP level (＞500 ng/L) is helpful in confirming cardiogenic dyspnea. However,BNP level between 100 ～ 500 ng/L isdeficient in confirming and excluding cardiogenic dyspnea.