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Right Ventricle: Difference between revisions
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Unfortunately, it is often rather difficult to measure. The easiest method to assess the Tei index is a tissue doppler signal of the RV in a AP4CH view. The tissue Doppler method allows for measurement of the Tei index or MPI as well as S', E', and A', all from a single image. You divide the isovolumic time (assessed as the time between TV closure (end of A') and opening (start of E') minus the ejection time) by the ejection time: | Unfortunately, it is often rather difficult to measure. The easiest method to assess the Tei index is a tissue doppler signal of the RV in a AP4CH view. The tissue Doppler method allows for measurement of the Tei index or MPI as well as S', E', and A', all from a single image. You divide the isovolumic time (assessed as the time between TV closure (end of A') and opening (start of E') minus the ejection time) by the ejection time: | ||
TEI index (RV MPI) = \{IVCT+IVRT \over RVET} = {TCOT-RVET \over RVET} | TEI index (RV MPI) = :<math>\{IVCT+IVRT \over RVET}<math> = :<math>{TCOT-RVET \over RVET}<math> | ||
The normal values of left and right ventricle differ. Due to the high pressures which must be generated by the LV, the isovolumic times of the LV are relatively long. The RV generates less pressure and therefore the index also lower with average at around 0.28. A Tei index above 0.55 (TDI) is considered abnormal. | The normal values of left and right ventricle differ. Due to the high pressures which must be generated by the LV, the isovolumic times of the LV are relatively long. The RV generates less pressure and therefore the index also lower with average at around 0.28. A Tei index above 0.55 (TDI) is considered abnormal. | ||