Eur Respir J:肺血容量改变可作为预测新冠肺炎预后的生物标志物

2021-10-04 小文子 MedSci原创

BV5%是预测COVID-19患者不良结局的一种新的生物标志物。

研究表明,血管炎症和血栓形成可能是COVID-19患者临床预后不良的重要驱动因素。尸检结果表明,与其他呼吸系统疾病相比,新冠肺炎患者的肺内皮炎和微血管病变更常见。对COVID-19患者进行胸部CT扫描分析发现,横断面积在1.25~5 mm之间的血管百分比(BV5%)显著下降。

发表在Eur Respir J杂志的一篇文章对美国两个州的10家医院的313例COVID-19阳性患者和195例COVID-19阴性患者的胸部CT扫描结果进行回顾性分析。研究假设COVID-19患者的胸部CT显示BV5%的减少与呼吸衰竭需要插管或死亡的不良结局相关。研究人员通过横截面积将血管分为3组。BV5、BV5-10和BV10分别表示横截面积在1.25和5 mm之间、5和10 mm之间以及 > 10 mm的血管中所含的血液容积。BV5%、BV5-10%和BV10%分别为横截面积在1.25~5 mm、5~10 mm和 > 10 mm之间血管中的血容量占肺总血容量的百分比。

研究结果显示,与COVID-19阴性患者相比,COVID-19患者的BV5%显著降低(25.3±7.4% versus 30.1±9.6%;p<0.01)。多变量模型分析发现,BV5%与新冠肺炎患者的死亡率和插管显著相关,可预测患者的预后。BV5%阈值25%的死亡率OR为5.58 (95% CI, 1.54–20.1; p<0.01),插管OR为3.2 (95% CI, 1.55–6.63; p<0.01),死亡或插管复合终点OR为2.54 (95% CI, 1.15–5.60; p=0.02)。BV5%并不能预测新冠肺炎患者的住院时间或插管持续时间。COVID-19阴性患者的住院时间与BV5%相关(exp(β)0.97,95%CI, 0.96–0.98;p<0.01)。年龄和BV5%预测新冠肺炎患者死亡或插管的准确率为0.83±0.02。BV5%不能预测非COVID-19患者的临床结局。

研究结果表明,BV5%是预测COVID-19患者不良结局的一种新的生物标志物。

原文出处:

Morris MF, Pershad Y, Kang P, et al. Altered pulmonary blood volume distribution as a biomarker for predicting outcomes in COVID-19 disease. Eur Respir J 2021; 58: 2004133 [DOI: 10.1183/13993003.04133-2020].

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