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目的 探讨T ei 指数在传染性单核细胞增多症（IM ）合并心肌损害儿童左心功能评价的意义。方法 检测并比较 IM 合并心肌损害患儿96例（观察组）和正常对照组40例（对照组）左心室射血分数（EF）、二尖瓣舒张早期血流速度峰值（E峰）及舒张晚期血流速度峰值（A峰）、（E／A ）比值、左心室等容收缩时间（ICT）、等容舒张时间（IRT）、射血时间（ET），计算Tei指数。结果 观察组EF、E／A比值与对照组比较差异无统计学意义（P ＞0．05），左室Tei指数较对照组明显增大（0．48±0．09vs0．39±0．08，P ＜0．05），且Tei指数与EF、E／A无显著相关（ P ＞0．05）。结论 IM合并心肌损害患儿存在心脏整体功能异常，Tei指数能简便、敏感检测其功能变化。“,”Objective]To explore the value of Tei index in the evaluation of left heart function of myocar‐dial damage in children with infectious mononucleosis(IM ) .[Methods]Left ventricular ejection fraction(EF) , mitral valve early diastolic blood flow velocity peak(E)/late diastolic blood flow velocity peak(A) ratio ,left ventricular isovolumetric contraction time(ICT ) ,isovolumic relaxation time(IRT ) and ejection time(ET ) in 96 cases of IM with myocardial damage(observation group) and 40 normal subjects(control group) were measured and compared .Tei index was calculated .[Results]There was no significant difference in EF and E/A between observation group and control group( P >0 .05) .Compared with control group ,left ventricular Tei index in observation group was obviously increased[(0 .48 ± 0 .09) vs .(0 .39 ± 0 .08)]( P 0 .05) .[Conclusion]Pediatric patients with IM and myocardial damage have abnormal whole cardiac function .Tei index can conveniently and sensitively detect the change of cardiac function .