Application value of evaluation the left ventricular outflow obstruction of hypertention and hypertrophic cardiomyopathy by transthoracic echocardiography

Objective: To investigate the anatomic characteristics and feature of flow dynamics in left ventricular outflow obstruction of hypertention and hypertrophic cardiomyopathy(HCM) by TTE.Methods: 31 patients with left ventricular outflow obstruction including 12 patients with hypertension complicated with left ventricular outflow obstruction and 19 patients with HCM with obstruction of hypertrophic left ventricular out tract cardiomyopathy.The interventricular septal thickness(IVST),posterior wall thickness(PWT),left ventricular outflow velocity and maximum pressure grade of above two groups were measured at baseline and after provocation test.Results: IVST of Hypertrophic Cardiomyopathy group was obviously higher than hypertension group,the comparision between PWT of the two groups does not be significantly different.After provocation test,flow velocity of left ventricular outflow and pressure grade were higher than those at baseline.Conclusion: TTE can accurately evaluate left ventricular outflow obstruction,as well as the degree and type of the obstruction.