@article{article_878370, title={The Comparison of Left Ventricular Myocardial Performance Index (Tei index) in Term and Prema-ture Neonatal Calves}, journal={Dicle Üniversitesi Veteriner Fakültesi Dergisi}, volume={14}, pages={27–30}, year={2021}, DOI={10.47027/duvetfd.878370}, author={Naseri, Amir and Turgut, Kürşat and Akyüz, Enes and Akar, Aybars and Yıldız, Ramazan and Şen, İsmail}, keywords={Doppler, echocardiography, myocardial performance index, premature}, abstract={<p>The neonatal heart is different from the adult heart in regard to both biochemical and structural features. Echocardiographic studies in human neonatology show that the myocardial function of left ventricle (LV) of premature infants differs from term infants. No study involving myocardial performance index (MPI) in neonatal animals has been performed until now. The objective of the present study was to evaluate LV MPI in premature calves and compare it to healthy newborn term calves. Ten healthy term and 20 premature calves were used. Echocardiographic evaluations were performed at days 1, 2, and 3 after birth and isovolumic contraction time (IVCT), isovolumic relaxation time (IVRT), ejection time (ET), and MPI calculated with PW tissue Doppler imaging (PW-TDI). Results of the study showed that the IVRT of the LV of premature calves was shorter than seen in healthy term calves. The LVMPI of healthy term calves was also higher than in premature calves. In conclusion, MPI measurement is feasible in neonatal calves. Significant decrements in MPI and shorter IVRT of preterm calves could be the result of the non-closure of the ductus arteriosus (DA), and along with the decreased afterload. Echocardiography and Doppler imaging technique are useful tools for exploring and follow up the cardiovascular system in neonatal calves. <br /> </p>}, number={1}, publisher={Dicle University}