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Fig. 1.

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Fig. 1. Tissue Doppler imaging at basal portion of right ventricle (RV) in pulmonary arterial hypertension (PAH) rat model. The isovolumetric contraction time (IVCT) was determined as the time that has passed between the end of the a’ wave to the onset of the next s’ wave, and the isovolumetric relaxation time (IVRT) was determined as the time that has passed between the end of the s’ wave to the onset of the next e’ wave. Ejection time (ET) was also measured. The Tei index was then calculated from the tissue Doppler imaging using the following formula: IVRT+IVCT/ET. s’, systolic myocardial velocity; e’, early diastolic myocardial velocity; a’, late diastolic myocardial velocity; LVET, left ventricle ejection time.

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