RESUMO
Objective To study the influencing factors on the false negative of electrocardiogram tread?mill exercise test.Methods One hundred and seventy cases coronary heart disease( CHD) patients with coro?nary angiography and carried out electrocardiogram treadmill exercise test from January 2012 to June 2015 in Cardiology Department of the People’ s Hospital of Yanchang County were selected as research objects,including 80 cases of false negative and 90 of positive.The clinical data of two groups were analyzed retrospectively.Results (1)Single factor analysis:CAG results in the false negative group showed that there were 54 cases(67.50%) of single vessel stenosis,14 cases(17.50%) of two vessel stenosis,12 cases(15.00%) of three vessel stenosis,in positive group there were 48 cases(53.33%),34 cases(37.78%) and 8 cases(8.89%) respectively,the differ?ences between the two groups was significant(χ2=8.93,P<0.05).The ST segment of the coronary artery stenosis in the false negative group was 19 cases(23.75%),83 cases (92.22%) in the positive group.There were 61 ca?ses (76.25%) and 7 cases(7.78%) with good collateral circulation in the coronary artery of the two groups,re?spectively,the difference between the two groups was significant(χ2=82.74,P<0.01).There were significant differences in terms of left anterior descending artery(LCX),left anterior descending branch(LAD),left main trunk(LM) diameter between the two groups((3.58±0.95) mm vs. (3.47±0.15) mm,(4.25±0.11) mm vs. (3.94±0.17) mm,(4.58±0.37) mm vs. (4.37±0.26) mm;t=2.91,6.80,2.06;P<0.05).(2)Considering false negative and positive as a dependent variable,and items with significance level including the number of narrow blood vessels,the diameter of coronary artery,LCX,LAD and LM diameters as independent variables in the sin?gle factor analysis,logistic regression analysis was carried out to find that LAD had significant difference in diam?eter,which was independent risk factor for the development of electrocardiogram exercise test false negatives( OR=16.95,95%CI 3.58-80.27,P<0.01).Conclusion False negative is associated with coronary artery diameter for coronary heart disease patients after electrocardiogram treadmill exercise test.The wider coronary diameter is, the easier to produce false negative results in exercise treadmill test.