CN104462866A - 气道侵袭性曲霉病评分模型及其建立方法 - Google Patents
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Abstract
本发明属于生物技术领域,具体是一种气道侵袭性曲霉病评分模型及其建立方法,其特征在于:首先用单因素分析筛选出两组之间有差异的危险因素,用逐步回归法进一步选取变量最终作为多元Logistic分析的自变量,进行多元Logistic分析后得出每个自变量的回归系数β,以其中最小的β值为基数,算出其他自变量的β值与之相比的倍数,即为每个自变量相应的分数;按上述评分模型对病例组和对照组进行评分,通过绘制受试者工作特征(ROC)曲线,确定具有较高预测价值的临界分值。运用本发明模型后明显提高气道侵袭性曲霉病的诊断治疗及抢救成功率,有待临床进一步实践和推广。
Description
技术领域
本发明属于生物技术领域,更具体地,是一种气道侵袭性曲霉病评分模型及其建立方法。
背景技术
气道侵袭性曲霉病(AWIA)病变部位限于气管—细支气管,占侵入性肺曲菌病(IPA)的近1/3,临床上对该病的认知较少,特征性不甚强,目前AWIA患者的诊断一般是病理学证实为气道曲菌感染,经支气管镜检查,病变部位活检取样,分别送病理及培养才能以确诊,由于大多数AWIA患者存在着全身和局部的免疫功能低下,全身应用抗真菌药物抵达感染部位的药物浓度有限,气道曲菌感染的控制比较困难,病死率高。所以只有早期诊断,提高对AWIA的认识以及早期诊断水平,采取积极抗真菌治疗,控制原发病,加强全身的免疫支持和调节,大气道曲霉病必要时配合支气管镜下的腔内介人治疗,才能明显降低患者的病死率。故提高临床医生对该病的认识,早期诊断,早期开展支气管镜检查和治疗,可以显著改善预后。
发明内容
本发明的目的是针对现有技术的不足,提供一种气道侵袭性曲霉病评分模型及其建立方法,从而实现科学客观地对AWIA进行早期诊断,早期开展支气管镜检查和治疗,从而显著改善预后。
为了达到上述目的,本发明通过以下技术方案实现:本发明一种气道侵袭性曲霉病评分模型,其特征在于:
各相关因素的分值为
选取总评分>7分作为鉴别AWIA和IPA非AWIA的临界值。
上述气道侵袭性曲霉病评分模型的建立方法是:
A.根据IPA组合AWIA组两组患者的基础疾病、临床表现和影像学进行IPA病灶定位分类,采用chi squareχ2检验分析各个分类变量的单因素,采用Student’s t检验分析连续变量,均进行双侧检验,P≤0.05为有显著性差异;
B.以多元Logistic回归分析为基础建立诊断评分模型:首先用单因素分析筛选出两组之间有差异的危险因素,用逐步回归法进一步选取变量最终作为多元Logistic分析的自变量,进行多元Logistic分析后得出每个自变量的回归系数β,以其中最小的β值为基数,算出其他自变量的β值与之相比的倍数,即为每个自变量相应的分数;
C.确定AWIA患者的临界分值:按上述评分模型对两组患组进行评分,通过绘制受试者工作特征(ROC)曲线,确定具有较高预测价值的临界分值。
本发明根据患者的基础疾病、临床表现和影像学进行IPA病灶定位分类,采用气道侵袭性曲霉病诊断评分模型,提高诊断的客观性和正确性,采取恰当的确诊、治疗措施。运用本发明模型后明显提高气道侵袭性曲霉病的诊断治疗及抢救成功率,有待临床进一步实践和推广。
附图说明
图1为本发明实施例两组患者评分ROC曲线。
具体实施方式
下面结合实施例对本发明作具体阐述:
收集复旦大学附属中山医院和金华市中心医院共51例确诊为AWIA的患者,其中男25例,女26例,年龄27~74岁,平均年龄54岁。选择同期住院的确诊为IPA而非AWIA的患者51例,其中男24例,女27例,年龄16~84岁,平均年龄59岁。
上述两组患者采样标准:
AWIA组患者都经支气管镜检查,病变部位活检取样,分别送病理及培养,病理和/或培养结果符合以下两条标准者:①胸腔积液、支气管肺组织涂片或培养1次阳性即可确诊;痰或支气管冲洗液中找到真菌菌丝和孢子,或培养出同一菌种3次以上;②病理学证实为气道曲菌感染;近期有呼吸道感染症状,支气管镜检查证实管腔内有病灶形成。
IPA组患者诊断标准参照《曲霉菌病的治疗:美国感染病学会临床实用指南》的诊断标准及我国2007年《肺真菌病诊断和治疗专家共识》,确诊为IPA而非AWIA患者。
本发明根据临床症状缓解程度、支气管镜检查腔内病变的改善情况和CT显示病灶改善来评价治疗疗效。治愈:指临床症状消失,支气管腔内病灶消失及CT显示病灶消失或消散90%;有效:指临床症状减轻,支气管腔内病灶减少,CT显示病灶消散≥50%;无变化:指临床症状和支气管腔内病灶无变化,CT显示病灶消散<50%;恶化:临床症状加重,支气管腔内病灶恶化,CT显示病灶增加。
本实施例通过上述两组患者建立气道侵袭性曲霉病评分模型:
A.根据患者的基础疾病、临床表现和影像学进行IPA病灶定位分类,采用chi squareχ2检验分析各个分类变量的单因素,采用Student’s t检验分析连续变量,均进行双侧检验,P≤0.05为有显著性差异;具体
(一)、两组患者的一般资料和基础疾病(见表1与表2)
两组患者的性别没有差异,AWIA组的平均年龄为53.84±12.57岁,IPA组的平均年龄为59.29±13.29,两组年龄有差异(P<0.05),似乎年龄大者易发生IPA。基础疾病中,COPD患者发生IPA的明显增多(P<0.05),余无明显差异。
表1两组患者的性别、年龄对比
表2两组患者的基础疾病比较
(二)、两组患者的临床表现和影像学检查(见表3)
两组患者的临床表现和影像学检查比较见表3。
表3两组患者不同观察项目的比较
B.以多元Logistic回归分析为基础建立诊断评分模型:
从两组患者的临床症状看出,发热患者在IPA组中明显增多,其余项目均无明显差异。在影像学表现中,多发团状或斑片状阴影、受累部位气管、支气管壁粘膜增厚、管腔内有新生物突出、管腔狭窄和多发小结节、空气半月征和晕征有明显差异。而单发的团块影表现两组略有差异(p=0.10)。用逐步回归法进一步选取COPD、年龄、发热、多发团状或斑片状阴影、受累部位气管、支气管壁粘膜增厚、管腔内有新生物突出、管腔狭窄和多发小结节、单发的团块影作为多元Logistic分析的自变量,以多元Logistic回归分析为基础建立诊断评分模型,分析后得出各自回归系数β(表4)。由于多发团状或斑片状阴影龄的β值最小,因此我们以此它的回归系数为基准,其他各变量的回归系数与之相除即得到相应的权重分数,由呼吸科专家共同商榷,对其中极少数项目的分数进行微调,最终建立评分模型。按此模型对2组进行评分,AWIA组平均(5.04±3.316)分,IPA组平均(4.04±1.414)分,二者比较P=0.169,差异不是很明显。
表4诊断评分模型
C.确定AWIA患者的临界分值:按上述评分模型对病例组和对照组进行评分,通过绘制受试者工作特征(ROC)曲线(如图1),确定具有较高预测价值的临界分值。
根据二组评分所做的ROC曲线下面积为0.583[95%可信区间(CI)0.482-0.680]。选取总评分>7分作为鉴别AWIA和IPA非AWIA的临界值时,诊断的特异性较理想(98.04%),但敏感性差(25.49%)。
Claims (2)
1.一种气道侵袭性曲霉病评分模型,其特征在于:
各相关因素的分值为
选取总评分>7分作为鉴别AWIA和IPA非AWIA的临界值。
2.如权利要求1的气道侵袭性曲霉病评分模型的建立方法是:
A.根据患者的基础疾病、临床表现和影像学进行IPA病灶定位分类,采用chi square χ2检验分析各个分类变量的单因素,采用Student’s t检验分析连续变量,均进行双侧检验,P≤0.05为有显著性差异;
B.以多元Logistic回归分析为基础建立诊断评分模型:首先用单因素分析筛选出两组之间有差异的危险因素,用逐步回归法进一步选取变量最终作为多元Logistic分析的自变量,进行多元Logistic分析后得出每个自变量的回归系数β,以其中最小的β值为基数,算出其他自变量的β值与之相比的倍数,即为每个自变量相应的分数;
C.确定AWIA患者的临界分值:按上述评分模型对病例组和对照组进行评分,通过绘制受试者工作特征(ROC)曲线,确定具有较高预测价值的临界分值。
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CN109994214A (zh) * | 2019-04-13 | 2019-07-09 | 中国医学科学院北京协和医院 | 克罗恩病和肠白塞的鉴别模型及模型构建方法 |
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CN111599475B (zh) * | 2020-05-07 | 2023-08-25 | 江西省人民医院 | 预测冠脉慢性完全闭塞病变介入治疗成功率的评分模型 |
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