非嗜酸性粒细胞性哮喘患者可出现暂时性痰液嗜酸性粒细胞增多,沙美特罗无预防作用
2012/10/11
摘要
背景和目的:未经激素治疗的、有哮喘症状的患者,痰液嗜酸性粒细胞数较低。本试验研究较低的嗜酸性粒细胞计数是否在沙美特罗单药治疗期间能维持。
方法:40名未经激素治疗的、有哮喘症状、痰液嗜酸性粒细胞<3%的患者随机分为开放标记的沙美特罗治疗组(50 µg每日两次,n = 30)和氟替卡松治疗组(125 µg每日两次,n = 10),随后在1个月、3个月和6个月时进行评价。所有患者每次就诊时检测肺活量,同时进行乙酰甲胆碱激发测试和痰液诱导。整个研究期内记录症状评分和呼气峰值流速。患者如果出现哮喘发作或症状加重,允许任何时候退出试验。
结果:整个研究期内,两组患者的平均痰液嗜酸性粒细胞百分数维持正常(≤1.9%)。整个研究期内,沙美特罗治疗组的80个样本中,65个样本的嗜酸性粒细胞百分数≤1.9%。8名患者出现哮喘发作,其中1名患者出现痰液嗜酸性粒细胞增多。研究期内,12名患者(11名为沙美特罗组,1名为氟替卡松组)至少出现一次暂时性痰液嗜酸性粒细胞增多。这与哮喘发作无关(除了1名患者)。痰液嗜酸性粒细胞百分数在两组也未见变化。
结论:接受沙美特罗单药治疗的非嗜酸性粒细胞性哮喘患者中,大部分患者较低的痰液嗜酸性粒细胞计数在6个月内维持不变。然而,40%的患者出现暂时性痰液嗜酸性粒细胞增多,表明非嗜酸性粒细胞性哮喘不是一种稳定的表现型。
(林江涛 审校)
Respirology. 2012 Aug 10. doi:10.1111/j.1440-1843.2012.02242.x. [Epub ahead of print]
Transient sputum eosinophilia may occur over time in non-eosinophilic asthma and this is not prevented by salmeterol.
Bacci E, Latorre M, Cianchetti S, Bartoli M, Costa F, Di Franco A, Malagrinò L, Novelli F, Vagaggini B, Dente FL, Paggiaro P.
Source
CardioThoracic and Vascular Department, Pneumology Section, University of Pisa, Pisa, Italy.
Abstract
BACKGROUND AND OBJECTIVE:Symptomatic, steroid-naive asthmatic patients may have low sputum eosinophil numbers. The study aim was to determine whether low sputum eosinophil numbers persisted over time, during treatment with salmeterol monotherapy.
METHODS:Forty steroid-naive, symptomatic asthmatic patients, with sputum eosinophils <3%, were randomized to receive open-label salmeterol (50 µg twice a day, n = 30) or fluticasone (125 µg twice a day, n = 10), and were then assessed at 1, 3 and 6 months. All patients underwent spirometry, a methacholine challenge test and sputum induction at each visit. Symptom scores and peak expiratory flow were recorded throughout the study. Patients were permitted to withdraw from the study at any time, if they experienced exacerbations or deterioration of symptoms.
RESULTS:The average sputum eosinophil percentage remained normal (≤1.9%) in both groups over the study period. The eosinophil percentages were ≤1.9% in 65 of the 80 samples obtained from salmeterol-treated patients throughout the study period. Eight patients had an asthma exacerbation or deterioration, during which one developed sputum eosinophilia. Twelve patients, 11 of whom were randomized to salmeterol and one to fluticasone, developed transient sputum eosinophilia at least once during the study. This was not associated with asthma exacerbation (except for one patient). Sputum neutrophil percentage did not change in either group.
CONCLUSIONS:Low sputum eosinophil numbers persisted over six months in a majority of patients with non-eosinophilic asthma who received salmeterol monotherapy. However, transient sputum eosinophilia occurred in 40% indicating that non-eosinophilic asthma may not be a stable phenotype
Respirology. 2012 Aug 10. doi:10.1111/j.1440-1843.2012.02242.x. [Epub ahead of print]
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