血清内源性硫化氢在支气管哮喘患儿中的表达及与呼吸功能的相关性分析
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血清内源性硫化氢在支气管哮喘患儿中的表达及与呼吸功能的相关
性分析
目的探讨气体信号分子内源性硫化氢在支气管哮喘患儿血清中的表达情况及其与呼吸功能的相关性。方法选取2013年12月~2014年12月本院收治的50例支气管哮喘急性发作期患儿作为急性发作组,50例支气管哮喘缓解期患儿作为缓解组,选取同期的50例健康小儿作为对照组,采用敏感硫电极法检测血清硫化氢表达水平,采用肺功能检测仪检测各组呼吸功能,比较3组的内源性硫化氢表达水平及用力肺活量(FVC)、第一秒最大呼气率(FEV1%)、最大呼气中期流速(MMEF)等指标,分析急性发作期患儿FVC、FEV1%、MMEF与内源性硫化氢表达水平的相关性。结果急性发作组和缓解组的血清内源性硫化氢水平显著低于对照组,急性发作组的血清内源性硫化氢水平显著低于缓解组,差异有统计学意义(P<0.05)。急性发作组和缓解組的FVC、FEV1%及MMEF 水平显著低于对照组,急性发作组的FVC、FEV1%及MMEF水平低于缓解组,差异具有统计学意义(P<0.05)。急性发作组内源性硫化氢表达水平同用力肺活量、第一秒最大呼气率、最大呼气中期流速呈现正相关。结论内源性硫化氢在支气管哮喘患儿中的表达水平降低,并且和呼吸功能相关,检测内源性硫化氢水平对于预测肺功能具有一定的临床意义。
[Abstract] Objective To explore expressive level of endogenous hydrogen sulfide (H2S)in serum in children with bronchial asthma and its correlativity with respiratory function. Methods 50 children with bronchial asthma in acute attack stage from December 2013 to December 2014 in our hospital was selected as the acute attack group,50 children with bronchial asthma in remission stage were selected as the remission group and 50 cases of healthy children were selected as the control group during the same period.Endogenous H2S was detected with sensitive sulphur electrode and respiratory function was detected with lung function diagnostic system in every groups.The expression level of endogenous H2S,the index of forced vital capacity(FVC),forced expiratory volume in 1 second (FEV1%),maximal mid-expiratory flow (MMEF)among three groups was compared respectiveiy,and relativity of H2S with FVC,FEV1% and MMEF was analyzed in acute attack group. Results The level of H2S in the acute attack group and the remission group was lower than that in the control groups,with significant difference(P<0.05).The level of H2S in the acute attack group was lower than that in the remission group,with significant difference(P<0.05).The level of FVC,FEV1% and MMEF in the acute attack group and the remission group was lower than that in the control groups,with significant difference(P<0.05).The level of FVC,FEV1% and MMEF in the acute attack group was lower than that in the remission group,with significant difference(P<0.05).The level of H2S in serum was positive correlation with FVC,FEV1% and MMEF in acute attack group. Conclusion Expressive level of endogenous hydrogen sulfide in children with bronchial asthma is decreased,and which has correlative with respiratory function,detection of endogenous hydrogen sulfide has certain clinical
significance for predicting lung function.[Key words] Endogenous hydrogen sulfide;Bronchial asthma;Forced vital capacity;Forced expiratory volume in 1 second;Maximal mid-expiratory flow
支气管哮喘是儿童期最常见的呼吸系统疾病之一,全球每年大约有670万儿童被诊断为哮喘,我国近年来的调查资料也显示[1],国内小儿哮喘发病率呈上升趋势,哮喘已成为影响全球儿童健康的主要疾病之一。内源性硫化氢(H2S)是近年来发现的气体信号分子。有研究显示[2],在急、慢性肺病发病过程中,H2S可能参与肺功能损伤的过程,在小儿支气管哮喘的发病过程中,H2S是否参与其肺功能损伤以及对H2S进行检测是否具有临床意义目前尚缺乏研究。本研究就支气管哮喘患儿H2S的表达情况以及其对呼吸功能的影响进行研究,旨在探讨H2S在小儿支气管哮喘发病中的作用。
1 资料与方法
1.1 一般资料
选取2014年1月~2014年12月成都市妇女儿童中心医院呼吸科收治的50例支气管哮喘急性发作期患儿作为急性发作组,其中男29例,女21例;年龄6~11岁,平均(8.9±3.2)岁。选取同期的50例支气管哮喘临床缓解期患儿作为缓解组,其中男30例,女20例;年龄6~12岁,平均(8.6±2.8)岁。支气管哮喘急性发作期及临床缓解期诊断符合中华医学会儿科学会呼吸学组2008年修订的小儿支气管哮喘诊断和防治指南标准。选取同期体检的正常健康儿童50例作为对照组,其中男28例,女22例;年龄6~12岁,平均(8.4±3.1)岁。排除合并先天性心血管疾病患儿、胸廓病变患儿、免疫系统疾病患儿。3组的性别、年龄等一般资料比较,差异无统计学意义(P>0.05),具有可比性。所有患儿监护人对研究內容知情同意,且经院伦理委员会批准。
1.2 标本采集
各组患儿入选后,次日清晨采集空腹静脉血1 ml,立即在4℃条件下低温离心10 min,离心机转速3000 r/min,获得血清后深低温冰箱-70℃密封保存,用于测定H2S含量。
1.3 H2S检测
内源性H2S检测采用敏感硫电极法,配制标准S2-溶液,梯度稀释,敏感硫电极及参比电极(上海雷磁公司)采用去离子水冲洗3次,一同浸入标本中,检测S2-浓度,依据S2-浓度绘制标准曲线,血清标本解融后,加入抗氧化液后,敏感硫电极及参比电极一同浸入标本中,读数稳定后记录,依据标准曲线计算检测标本内源性H2S浓度。
1.4 呼吸功能检测