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Optimization of myocardial deformation imaging in term and preterm infants

Poon, Chuen, Edwards, Julie May, Joshi, Suchita, Kotecha, Sailesh and Fraser, Alan Gordon 2011. Optimization of myocardial deformation imaging in term and preterm infants. European Journal of Echocardiography 12 (3) , pp. 247-254. 10.1093/ejechocard/jeq192

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Abstract

Aims Myocardial deformation imaging is now used to assess regional ventricular function in infants but their small size presents particular technical challenges. We therefore investigated the determinants of reproducibility of myocardial longitudinal strain (ɛ) in term and preterm infants, in order to determine optimal technical settings. Methods and results Repeated longitudinal ɛ measurements of the mid-segments of the septum, and the left and right ventricular free walls, were performed using five different computation distances (CDs; also called strain length) in 20 infants. The coefficients of variation (CV) were calculated for each CD. Overall, ɛ measurements were most reproducible with a CD of 6 mm (CV 11.7%). In preterm infants (<34 weeks gestation; mean ± SD diastolic LV length, 20.3 ± 3.5 mm), ɛ measurements were most reproducible with CD of 6 mm (CV 7.2%); in term infants (>37 weeks gestation; mean ± SD diastolic LV length, 29.6 ± 3.0 mm), ɛ measurements were most reproducible with CD of 10 mm (CV 13.2%). The reproducibility of measuring ɛ increased with higher frame rates, from CV of 17.3% at frame rates <180 per s to 11.7% for frame rates >180 per s and 9.6% for rates >248 per s. Conclusion In newborn infants, tissue Doppler loops should be acquired at frame rates above 180 per s. Myocardial deformation analysis of preterm infants should be performed using a CD of 6 mm, whereas a CD of 10 mm is more reproducible in term infants.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > R Medicine (General)
R Medicine > RJ Pediatrics
Uncontrolled Keywords: infants; preterm; tissue; doppler; myocardial velocity imaging; strain length; Strain
Publisher: Oxford University Press
ISSN: 1525-2167
Last Modified: 08 Jan 2018 21:56
URI: http://orca.cf.ac.uk/id/eprint/27147

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