染色体22q11微缺失综合征的临床表现与荧光原位杂交诊断结果

目的研究22q11微缺失综合征（22q11 microdeletion syndrome,22q11 DS）的临床特征与荧光原位杂交技术（fluorescencein situhybridization,FISH）诊断结果的意义。方法评估临床表型,应用FISH技术检测外周血标本22q11区域的微缺失;对FISH结果和临床特征进行多因素Logistic回归分析。结果64例疑似患儿中FISH检测微缺失为14例,阳性率21.9%。确诊患儿广泛存在多发畸形。建立了以面容异常（x1）、先天性心脏畸形（x2）、免疫问题（x3）为变量的FISH诊断结果（y）的Logistic回归预测方程：y=-8.206＋2.324x1＋2.725x2＋1.674x3,P=exp（y）/[1＋exp（y）]。结论精确的临床评估可以初次筛选有22q11微缺失危险性的患儿,其FISH检查结果可通过Logistic回归方程进行预测。

Study on clinical features and fluorescence in situ hybridization detections of 22q11 microdeletion syndrome

Objective To investigate clinical features and the diagnosis by fluorescence in situ hybridization (FISH) of 22q11 microdeletion syndrome (22q11 DS). Methods The clinical data of suspects were analyzed, and their peripheral blood samples were tested by FISH for microdeletion of 22q11. The diagnosis and correlated clinical factors of 22q11 DS were investigated by using the multiple factor Logistic regression analysis and Chi-square test. Results In 64 suspects, 14 were shown to have 22q11 microdeletion with many different types of malformation, and the percentage was 21.9%. The Logistic regression predictive equation for 22q11 DS was: y=-8.206+2.324x1+2.725x2+1.674x3,P=exp(y)/[1+exp(y)], in which the concomit ant variables were facial dysmorphic features (x1), congenital heart defects (x2), thymus scarcity/infection problem (x3), the P value meant the probability of diagnosis of 22q11 DS. Conclusion Accurate clinical evaluation is just as preliminary screening to patients at risk for del22q11. The results of FISH test can be predicted by using the suitable Logistic regression equation.