The Feasibility And Cut-off Value Study Of Left Ventricle Tei Index Obtained By Doppler Tissue Imaging

Objective: Tei index is usually measured with pulsed wave Doppler (PWD). Our aim was to assess the degree of agreement between PWD and a method based on tissue Doppler imaging (TDI) and its clinic application.Material and Methods: Pulsed Doppler and tissue Doppler imaging study were performed in 75 patients with myocardial infarction in the past year were selected and diagnosed by strict clinical and assisted examination.and 75 normal subjects.The myocardial infarction model was creaded in 20 adult dogs. Pulsed Doppler and tissue Doppler imaging study were also performed in pre-operation and post-operation for 4 weeks.The comterts mainly studied:Pulsed Doppler study of transmitral inflow was made placing the sample between the tips of the mitral leaflets in the four chambers view and''a''interval was measured between cessation and onset of the mitral inflow. Pulsed Doppler study of left ventricular (LV) outflow was made placing the sample just below the aortic valve in the five chambers and''b''interval was measured between onset and cessation of the LV outflow.Intervals Conventional Tei index was obtained as (a b)/b. Other intervals were also measured from the same recordings: preejection period (PEP) was defined as the interval from the onset of Q wave of ECG to the onset of LV outflow; electromechanical delay (EMD) from Q wave to cessation of mitral inflow; isovolumic contraction time (ICT) was calculated as (PEP-EMD); isovolumic relaxation time (IRT) was obtained as (a–b-ICT). Finally,filling time (FT) was calculated as RR -a, where RR is the interval in milliseconds, deduced from heart rate. All measurements were performed off-line on digital recordings.Pulsed wave TDI was performed at septal mitral annulus and lateral mitral annulus. TDI isovolumic contraction time (tICT) was measured between cessation of...