单次血液嗜酸性粒细胞计数是否为嗜酸性粒细胞性哮喘的可靠标志物?
2012/11/19
摘要
简介:嗜酸性粒细胞性哮喘是哮喘的一种表现型,表现为支气管嗜酸性粒细胞浸润和对皮质类固醇治疗有效。近期采用嗜酸性粒细胞阻断剂进行的临床试验中,将血液嗜酸性粒细胞计数为300或400个/mm3或更高数值用于鉴别中等至严重哮喘患者。结果显示,即使是同一患者,同一天内,多次检测,数值也存在很大变异。
目的:研究同一中等哮喘患者一天内多次血液嗜酸性粒细胞计数是否存在显著变异。
方法:12名患者于24 h内多次检测血液嗜酸性粒细胞计数。
结果:12名受试者入选:7名患中等哮喘,3名患轻度哮喘,2名对照者无哮喘。血嗜酸性粒细胞计数的变异从17%到396%不等。未观察到特定的日间变异形式。3名中等哮喘患者(396%, 170%和154%)和1名轻度哮喘患者(164%)的变异最大,其他患者的计数变异≤84%。
结论:本研究显示,同一患者24-h内的血嗜酸性粒细胞计数存在明显变异。中等哮喘患者变异最大。这些结果对将单次嗜酸性粒细胞计数作为一个变量提出了质疑。
(刘国梁 审校)
J Asthma. 2012 Oct;49(8):807-10. Epub 2012 Aug 20.
Is a single blood eosinophil count a reliable marker for "eosinophilic asthma?".
Spector SL, Tan RA.
Source
Department of Medicine, UCLA Medical Center , Los Angeles, CA 90095 , USA.
Abstract
INTRODUCTION: "Eosinophilic asthma" refers to an asthma phenotype characterized by predominance of eosinophils in the bronchial airways and corticosteroid responsiveness. Recent clinical trials of eosinophil-blocking agents have utilized a blood eosinophil count of 300 or 400 eosinophils/mm3 or higher to identify subjects with moderate to severe asthma. We observed multiple instances of counts which varied widely in the same patient within the same day.
OBJECTIVES:To determine whether there is significant variability in blood eosinophil counts taken throughout the day in the same patients with moderate asthma.
METHODS:Twelve subjects had serial blood eosinophil counts obtained within a 24-hour period.
RESULTS:Twelve subjects were enrolled: seven subjects had moderate asthma, three subjects had mild asthma, and two control subjects had no asthma. The variability of blood eosinophil counts ranged from 17% to 396%. No specific diurnal pattern was found among the subjects. The highest variability were seen in three moderate asthmatics (396%, 170%, and 154%) and one mild asthmatic (164%) while the other subjects had variability of 84% or less.
CONCLUSIONS:This study showed significant variability in blood eosinophil counts within a 24-hour period in the same subjects. The highest variability was seen in moderate asthmatics. These findings would appear to place the utility of a single eosinophil count in question.
J Asthma. 2012 Oct;49(8):807-10. Epub 2012 Aug 20.
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