【摘要】 目的 探讨喀什地区儿童支气管哮喘(BA)急性发作的临床特点,以及25-羟维生素D3(25(OH)D3)
水平与疾病严重度的相关性。方法 选取喀什地区某三甲医院收治的6~14岁BA急性发作患儿为研究对象,根据疾病严重度(轻度、中度及重度)及血清25(OH)D3水平(正常、不足及缺乏)进行分组,比较不同组的临床特征差异,分析血清(25(OH)D3)水平与疾病严重度的相关性。结果 共纳入112例患儿,男女比例为2.61∶1,年龄为9.0 (7.0,11.0)岁。112例患儿以春季发病为主,占42.9%。过敏原阳性率为74.1%(83/112),其中以吸入性过敏原为主(89.1%),树木组合阳性率最高(47.0%)。疾病严重度轻度组36例、中度组51例、重度组25例,随着疾病严重度的增加,用力肺活量(FVC)、第1秒用力呼气量(FEV1)、FEV1与FVC的比值(FEV1/FVC)逐渐下降(P lt; 0.001);重度组嗜酸性粒细胞(EOS)百分比高于轻度组(P lt; 0.05)。25(OH)D3水平正常组28例、不足组21例、缺乏组35
例;缺乏组FVC、FEV1、FEV1/FVC、最大呼气峰流速均低于不足组和正常组(P均lt; 0.05);3组患儿疾病严重度比较差异有统计学意义(H = 9.538,P = 0.008),血清25(OH)D3水平与BA急性发作的疾病严重度呈负相关(τ = -0.304,P = 0.002)。结论 喀什地区学龄期儿童BA急性发作高峰为春季,吸入性过敏原以树木组合为主。随着病情严重度的增加,患儿肺功能逐渐下降。血清25(OH)D3水平与BA患儿肺功能及急性发作的病情严重度有相关性。
【关键词】 支气管哮喘;急性发作;临床特点;25羟-维生素D3;儿童;喀什
Clinical characteristics of acute attacks of BA in school-age children in Kashgar region and correlation analysis of 25(OH)D3 levels with disease severity
RIZIWANGULI Maitusong1, ASIMUGULI Wubuli1, AYINUER Abulimiti1, XU Lühong2, CAI Yun3
(1.Department Ⅱ of Pediatrics, the First People’s Hospital of Kashgar, Kashgar 844000, China; 2.Department of Pediatrics, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou 510120, China; 3.Department of Pediatrics, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, China)
Corresponding author: CAI Yun, E-mail: caiyun@mail.sysu.edu.cn
【Abstract】 Objective To explore the clinical characteristics of acute attacks of bronchial asthma (BA) in children in Kashgar region, and analyze the impact of 25-hydroxyvitamin D3 (25(OH)D3) levels on disease severity. Methods Children with acute BA attacks, aged 6-14 years, admitted to a certain thirdtier A-level Hospital of Kashgar were enrolled and divided into different groups according to disease severity (mild, moderate and severe) and 25(OH)D3 levels (normal, insufficiency and deficiency). Clinical characteristics were compared among different groups. The correlation between 25(OH)D3 levels and disease severity was analyzed. Results A total of 112 children were enrolled, with a male-to-female ratio of 2.61∶1, with a median age of 9.0 (7.0-11.0) years old. The highest incidence was found in spring (42.9%). The positive rate of allergens is 74.1%(83/112), with inhaled allergens as the main type (89.1%), and the tree combination had the highest positive rate (47.0%).Based on disease severity, 36 cases were assigned into the mild group, 51 cases in the moderate group, and 25 cases in the severe group. As the disease severity was aggravated, the forced vital capacity (FVC), forced expiratory volume at 1 second (FEV1), and the ratio of FEV1 to FVC(FEV1/FVC) were gradually decreased (all P lt;
0.001). The eosinophil (EOS) count in the severe group was higher than that in the mild group (P lt; 0.05). According to 25(OH)D3
levels, 28 cases had normal 25(OH)D3 levels, 21 cases with insufficient 25(OH)D3 levels, and 35 cases with 25(OH)D3 deficiency. The FVC, FEV1, FEV1/FVC, and peak expiratory flow (PEF) in the 25(OH)D3 deficiency group were significantly lower than those in the insufficient and normal 25(OH)D3 groups (all P lt; 0.05). The disease severity significantly differed among three groups (H = 9.538, P = 0.008). Serum 25 (OH) D3 levels were negatively correlated with the severity of BA attacks (τ = -0.304, P =
0.002). Conclusions Spring is the peak season of acute attacks of BA in school-age children from Kashgar. Inhaled allergens are mainly composed of tree combination. As the severity of this condition deteriorates, lung function of the affected children are gradually declined. Serum 25 (OH) D3 levels are associated with lung function and the severity of acute attacks in children with BA.
【Key words】 Bronchial asthma; Acute attack; Clinical characteristics; 25-hydroxyvitamin D3; Child; Kashgar
支气管哮喘(bronchial asthma,BA)是由多种细胞共同参与引起的慢性气道炎性反应性疾病,是儿童常见的慢性呼吸系统疾病。BA急性发作是儿科常见的急症之一,表现为突发性的咳嗽、喘息伴呼吸困难,如不能快速处理以缓解症状,可迅速出现呼吸衰竭,甚至会危及生命[1-3]。我国儿童BA的患病率呈逐年升高的趋势,早期诊断和治疗对于减轻BA相关疾病负担具有重要价值[1, 4-7]。BA发病机制未完全明确,且不同地域的流行病学特点也有一定的差异[8-10]。近年来有研究显示,BA患儿血清25-羟维生素D3[25-hydroxyvitamin D3,
25(OH)D3]缺乏或不足现象比较突出,25(OH)D3
水平可影响BA发作严重度,补充维生素D可以减少BA发作次数及缩短病程[11-12],但两者相关性仍存在争议[13-14]。目前关于喀什地区儿童BA急性发作的临床特点及25(OH)D3与BA的相关性研究相对较少,本研究旨在分析喀什地区BA急性发作患儿的临床特点并探讨25(OH)D3与BA急性发作严重程度的相关性,为提高儿童BA急性发作的防治水平提供参考。
1 对象与方法
1.1 研究对象
本研究为回顾性研究,通过电子病历系统,收集2022年5月1日至2024年4月30日喀什地区第一人民医院儿内二科收治的BA急性发作患儿的临床资料。纳入标准:①符合儿童BA诊断与防治指南(2016年版)诊断标准[15],且处于急性发作期;②年龄6~14岁,且可以配合肺功能检查。排除标准:①病情危重,无法接受肺功能检查;②合并严重心、肺、肝、肾功能疾病,合并认知功能障碍或精神类疾病;③非医嘱离院。本研究通过喀什地区第一人民医院伦理委员会审查[批件号:〔2023〕快审研第(28)号],患儿监护人均知情同意。
1.2 资料收集
收集患儿的一般资料及临床资料,包括性别、年龄、发病季节、血清总免疫球蛋白E(immunoglobulin E,IgE)、嗜酸性粒细胞(eosinophil,EOS)百分比、血清25(OH)D3水平、肺功能指标[用力肺活量(forced vital capacity,FVC)、第1秒用力呼气量(forced expiratory volume in the first second,FEV1)、FEV1与FVC的比值(FEV1/FVC)、最大呼气峰流速(peck expiratory flow,PEF)]和过敏原检测结果。
1.3 指标检测
患儿入院24 h内常规抽取静脉血检测外周血EOS计数、血清总IgE水平、血清25(OH)D3水平、过敏原。总IgE阳性的判断标准:6~9 岁总IgE水平≥90 IU/mL,10~15岁总IgE水平≥200 IU/mL,判定标准按试剂盒参考范围[16-17]。血清25(OH)D3水平判定标准,25(OH)D3浓度lt;30 nmol/L为缺乏,25(OH)D3浓度30~50 nmol/L为不足,25(OH)D3浓度≥50 nmol/L为正常[18]。过敏原检测使用德国欧蒙公司(ERROIMMUN)吸入性及食物性过敏原特异性IgE(specific IgE,sIgE)抗体检测试剂盒(欧蒙免疫印迹法),吸入性过敏原包括10种:树木组合(柳树、杨树、榆树)、普通豚草、艾蒿、室内尘螨组合、屋尘、猫毛、狗上皮、蟑螂、霉菌组合(点青、烟曲霉/分支、交链)、葎草;食物性过敏原包括9种:鸡蛋白、牛奶、花生、黄豆、牛肉、海鱼组合(鲟鱼/龙虾/扇贝)、虾、蟹、羊肉;将过敏原sIgE抗体浓度等级分为0~6级,0级为阴性,1~6级为阳性,级数越高,阳性程度越强。
入院治疗前进行肺功能测定,使用德国耶格肺功能仪,按照标准操作规程进行,所有结果均重复3次,取平均值。根据儿童BA诊断与防治指南(2016年版)中6岁及以上儿童BA急性发作的严重度分级进行疾病严重度评估,包括轻、中和重度[15]。
1.4 统计学处理
采用SPSS 26.0处理数据,正态分布计量资料以表示,3组间比较采用单因素方差分析,两两比较采用Tukey-Kramer检验。非正态分布计量资料以M(P25,P75)表示,3组间比较采用Kruskal-Wallis秩和检验,两两比较采用Bonferroni法(结果展示调整后的P值)。计数资料以n(%)表示,无序分类资料组间比较采用χ 2检验或Fisher确切概率法,等级资料组间比较采用Kruskal-Wallis秩和检验,多重比较采用Bonferroni 法(结果展示调整后的P值)。25(OH)D3水平与哮喘急性发作严重度之间的相关性采用Kendall’s tau-b相关性分析。以双侧P lt; 0.05为差异有统计学意义。
2 结 果
2.1 BA急性发作患儿的临床特点
2.1.1 年龄及性别分布
本研究共纳入112例患儿,其中男81例、女31例,男女比例为2.61∶1;年龄9.0(7.0,11.0)岁,6~10岁者占72.3%(81/112)。按疾病严重度分组,轻度组36例(32.1%)、中度组51例(45.6%)、重度组25例(22.3%)。不同疾病严重度患儿年龄、性别比较差异无统计学意义(P均gt;"0.05)
2.1.2 发病季节分布
BA急性发作春夏秋冬四季均有发病,春季(3至5月)发病48例(42.9%),夏季(6至8月)发病23例(20.5%),冬季(12月至次年2月)发病22例(19.6%),秋季(9至11月)发病19例(17.0%)。不同疾病严重度患儿的发病季节比较差异无统计学意义(P gt; 0.05)
2.1.3 过敏原检测结果
过敏原阳性率74.1%(83/112),其中以吸入性过敏原为主89.1%(74/83),过敏原阳性率从高到低,依次为树木组合47.0%(39/83)、猫毛21.7%(18/83)、艾蒿9.6%(8/83)、霉菌组合6.0%(5/83)。不同疾病严重度患儿在过敏原阳性率方面比较差异无统计学意义(P gt; 0.05)
2.1.4 住院时间及症状、体征持续时间
不同疾病严重度患儿住院日数、咳嗽及喘息持续时间比较差异均无统计学意义(P均gt; 0.05);3组哮鸣音持续时间不全相同,重度组哮鸣音持续时间长于轻、中度组(P均lt; 0.05),轻度组与中度组比较差异无统计学意义(P gt; 0.05)
2.1.5 疾病严重度与肺功能指标的关系
随着疾病严重度的增加,肺功能指标(FVC、FEV1、FEV1/FVC)逐渐降低(P lt; 0.001),两两比较显示组间比较差异均有统计学意义(P均lt; 0.05)。不同疾病严重度组别的EOS百分比存在差异(P lt; 0.05),两两比较显示重度组EOS百分比大于轻度组(P lt; 0.05),重度组与中度组之间、中度组与轻度组之间比较差异则无统计学意义(P均gt; 0.05)。不同疾病严重度患儿的总IgE阳性率比较差异无统计学意义(P gt; 0.05),见表3。
2.2 血清25(OH)D3水平与BA急性发作的相关性
共84例患儿进行了血清25(OH)D3检测,正常组28例(33.3%),不足组21例(25.0%),缺乏组35例(41.7%)。3组患儿住院日数以及咳嗽、喘息、哮鸣音持续时间比较差异无统计学意义(P均gt; 0.05)
不同血清25(OH)D3水平组肺功能指标(FVC、FEV1、FEV1/FVC、PEF)比较差异有统计学意义(P lt; 0.05)。缺乏组FVC、FEV1、FEV1/FVC、PEF数值低于不足组和正常组(P均lt;0.05),不足组与正常组之间比较差异无统计学意义(P gt; 0.05)不同血清25(OH)D3水平组疾病严重度比较差异有统计学意义(H = 9.538,P = 0.008),见表4。相关分析显示,25(OH)D3水平与BA急性发作的疾病严重度呈负相关,Kendall相关系数(τ)为-0.304、P = 0.002。
3 讨 论
BA在儿童中的发病率有逐年上升趋势,不同年龄段BA患儿的临床特点可能不同。年龄较小儿童中男童的BA患病率高于女童[4, 19-21],但随着年龄的增长,BA发病率的性别差异变小,至青春期后逐渐消失,考虑可能原因为年龄较小男童的气道相对狭窄,男童的气道高反应性相对于女童而言更明显,随着年龄增长这种气道差异逐渐减少[22]。在本研究中,不同性别、年龄的患儿在疾病严重度方面比较无统计学差异,这与郑明升等[23]的研究结果一致。
既往研究显示,不同地区儿童的BA急性发作在季节方面存在一定的差异,了解BA急性发作的季节性变化有重要的预防意义[24]。据文献报道,重庆、广州的BA急性发作高峰期为秋季[20, 23],无锡的BA急性发作高峰期则为换季时,6至8月份发病率最低[19]。各地区的BA急性发作高峰期存在差异可能与不同地区的气候、病原季节流行、空气污染情况不同有关。在本研究中,喀什地区BA急性发作的高发季节是春季,其次为夏季,考虑与喀什地处塔克拉玛干沙漠边缘,春夏季频繁出现沙尘天气有关。
不同地区、不同年龄段患儿的过敏原分布也可能存在差异。关猛猛等[25]报道新疆地区青少儿组首位过敏原是艾蒿(44.7%),其次为树组合(32.7%)。李维维等[26]报道河北保定地区的吸入性过敏原主要为霉菌、柏榆、屋尘螨,食物性过敏原主要为鸡蛋白、腰果、牛奶。陈广道等[9]报道广东广州地区过敏性疾病儿童的首位过敏原是屋尘螨/粉尘螨,随着年龄增长,过敏原IgE总阳性率逐渐升高,且吸入过敏原逐渐取代食物性过敏原成为主要过敏原。在本研究中,喀什地区学龄期BA急性发作患儿过敏原类型以吸入性过敏原为主,最常见的为树木组合,考虑可能与喀什地区气候特点有关。喀什地区属暖温带大陆性干旱气候带,四季分明,春夏常出现大风、沙暴、浮尘天气,花粉大量播散季节主要分布在春季和夏秋季。春季花粉播散期从3月初开始至5月中旬,此阶段花粉来源以树木为主,常见杨柳科杨柳属、榆科榆属等,过敏原检测中树木组合(柳树、杨树、榆树)的花季与喀什地区BA急性发作季节以春夏为主相吻合。本研究的BA急性发作患儿吸入性过敏原比例高于食物性过敏原,考虑原因为本研究的研究对象为6~14岁儿童,且此年龄段儿童的活动范围较婴幼儿大, 接触的吸入性过敏原的机会较高。根据过敏原的分布特点进行过敏原回避干预,如在沙尘天气佩戴口罩、适当避免接触宠物皮毛等,对预防BA急性发作有重要意义。
有研究者指出,EOS、IgE均参与BA的发生发展。过敏原进入人体时与IgE结合会促使大量炎症因子迅速释放,导致平滑肌收缩、血管通透性增加,引起喘息发生。IgE是一种变态反应介质,可与EOS细胞、肥大细胞结合,IgE与EOS相互结合,EOS活化释放碱性磷酸酶、嗜酸细胞阳离子蛋白、EOS衍生神经毒素、EOS过氧化物酶以及细胞因子和趋化因子等,导致气道上皮坏死,引发气道高反应性[27-29]。临床上常用EOS绝对值、百分比、外周血总IgE水平等检测指标判断BA患者的气道炎症情况[30-32]。本研究显示,重度组EOS百分比大高于轻度组,提示EOS与儿童BA急性发作的严重度有一定的相关性。张超等[33]发现,BA患儿EOS计数、总IgE水平均升高,且与BA疾病严重度呈正相关,可反映肺功能受损程度[34]。肺功能指标可客观反映患者气道功能,本研究结果显示,随着疾病严重度增加,患儿肺功能指标逐渐下降。有研究显示,肺功能下降的BA患者呼吸道感染风险明显增加,建议将改善肺功能作为预防BA患者发生呼吸道感染的一项重要措施[35]。
维生素D能调节钙磷平衡和骨骼重塑,近年的研究表明它还具有重要的免疫调节作用,可抑制气道炎症,改善气道高反应性,减少腺体分泌和支气管平滑肌细胞增殖,改善气道重塑[11]。有研究显示,BA患儿的血清25(OH)D3水平低于健康儿童,考虑可能与BA患儿受疾病的影响,户外活动受限,紫外线照射时间缩短,25(OH)D3的合成减少有关,此外,BA患儿出现呼吸困难时会造成缺氧,胃肠道功能会受影响,也会减少维生素D的摄入量[11, 36]。
也有研究者指出,血清25(OH)D3水平下降会加重肺功能损伤程度及BA急性发作严重程度[37-40]。本研究显示,BA急性发作患儿的血清25(OH)D3水平未达标者占66.7%(56/84),缺乏组患儿的肺功能指标较另外2组差,血清25(OH)D3水平与BA急性发作的疾病严重度相关。有研究者指出,在常规治疗基础上加用维生素D辅助治疗BA患儿,有助于提高疗效、缩短病程、改善肺功能、降低炎性因子水平、减少发作次数,因此推荐BA患儿可适当补充维生素D[41-42]。但相关结论存在争议,例如2015至2018年美国健康和营养调查数据库中一项针对2~17岁儿童的横断面研究显示,患儿BA急性发作的概率随着血清维生素D和维生素B2水平的升高而增加,随着血清维生素C水平的降低而增加,研究者提出BA高危儿应增加富含维生素C的食物摄入量,同时在日常生活中控制维生素D和维生素B2的摄入量[13]。因此,维生素D与儿童BA急性发作之间的相关性仍需进行更多的大样本量研究证实。
综上所述,喀什地区儿童BA急性发作高峰、吸入性过敏原分布与其他地区有所不同。早期监测EOS、肺功能、维生素D等指标有助于评估BA急性发作的疾病严重度。本研究为单中心回顾性研究,样本量偏少,且未包括6岁以下儿童,尚需进行大样本的多中心前瞻性队列研究来进一步验证研究结果。
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