ObjectiveTo investigate the value of instantaneous wave intensity (WI) technic in respect of evaluating left ventricular function in patients with hyperthyroidism.Methods46 patients with hyperthyroidism and 35 healthy controls were divided into two groups.The general material,conventional ultrasonic cardiogram material,WI parameters were obtained and compared,and the two groups had statistical differences for each index.ResultsGeneral material:heart rate and systolic blood pressure of hyperthyroidism group was higher than that of normal control group,diastolic blood pressure was lower than normal control group,and no obvious difference was found in the rest indexes.Conventional echocardiography information:compared with the control group,in hyperthyroidism group LVIDd,LVISd,LVEDV,LVESV,SV,LVEF had no significant difference,but other parameters had significantly.WI parameters:hyperthyroidism W1,W1-W2 was significantly higher,W2,R-W1 was significantly lower than control group The difference was statistically significant.Conclusion WI technology as a new indicator to reflect cardiac function through the intra-arteries dynamic of blood flow,can be quick,objective,non-invasive,and evaluate left ventricular function of hyperthyroidism effectively.