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. 2019 Sep 17;9(3):121. doi: 10.3390/diagnostics9030121

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Echocardiographic assessment of isovolumetric relaxation time (IVRT) by Tissue Doppler Imaging (TDI). Am (or A’): late diastolic annular velocity (septal, lateral, and average) via tissue Doppler imaging; Em (or E’): early diastolic annular velocity (septal, lateral, and average) via tissue Doppler imaging; Sm: systolic annular velocity; TRIV: isovolumetric relaxation time.