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01-02-2021 | Magnetic Resonance Imaging | Original Article

Negative Impact of the Left Ventricular Remnant Morphology on Systemic Right Ventricular Myocardial Deformation in Hypoplastic Left Heart Syndrome

Authors: Alan P. Wang, Angela M. Kelle, Meredith Hyun, Chelsea L. Reece, Phillip M. Young, Patrick W. O’Leary, M. Yasir Qureshi, Wanek Family Program for Hypoplastic Left Heart Syndrome Imaging Pipeline

Published in: Pediatric Cardiology | Issue 2/2021

Abstract

Left ventricular (LV) morphology may affect right ventricular (RV) function before and after Fontan palliation in patients with hypoplastic left heart syndrome (HLHS). We sought to assess the potential impact of LV morphology on RV function in patients with HLHS using cardiac magnetic resonance (CMR) imaging. A retrospective analysis of available CMR scans from all patients with HLHS was performed. LV morphology was categorized as absent/slit-like or globular/miniaturized. Volumetric analysis was performed using manual disc-summation method on steady-state free precession (SSFP) stack obtained in short-axis orientation of the ventricles. 4-chamber and short-axis SSFP images were used to measure strain on a semi-automated feature-tracking (FT) module. Two sample t-test was used to compare the groups. A total of 48 CMR scans were analyzed. Of those, 12 patients had absent/slit-like and 36 had globular/miniaturized LV morphology. Averaged 4-chamber longitudinal RV strain was significantly higher for absent/slit-like (− 17.6 ± 4.7%) than globular/miniaturized (− 13.4 ± 3.5; P = 0.002). Averaged 4-chamber radial RV strain was also significantly higher for absent/slit-like (33.1 ± 14.9%) than globular/miniaturized (21.6 ± 7.1; P = 0.001). For globular/miniaturized LV morphology, the decreases of 4-chamber longitudinal and radial strains were mainly attributable to the septal basilar and septal mid-ventricular segments. No differences were found in short-axis RV global circumferential strain between the morphologic subtypes (absent/slit-like − 15.0 ± 6.5, globular/miniaturized − 15.7 ± 4.7; P = 0.68). Larger LV remnants, with globular/miniaturized LV morphology, demonstrated diminished strain in the septal base and mid-ventricle segments. Patients with globular/miniaturized LV morphology may benefit with closer monitoring and lower threshold to start heart failure medications. These results exemplify the utility of including both septal and regional deformation in systemic RV strain analysis.

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Title: Negative Impact of the Left Ventricular Remnant Morphology on Systemic Right Ventricular Myocardial Deformation in Hypoplastic Left Heart Syndrome
Authors: Alan P. Wang
Angela M. Kelle
Meredith Hyun
Chelsea L. Reece
Phillip M. Young
Patrick W. O’Leary
M. Yasir Qureshi
Wanek Family Program for Hypoplastic Left Heart Syndrome Imaging Pipeline
Publication date: 01-02-2021
Publisher: Springer US
Keywords: Magnetic Resonance Imaging
Magnetic Resonance Imaging
Published in: Pediatric Cardiology / Issue 2/2021
Print ISSN: 0172-0643
Electronic ISSN: 1432-1971
DOI: https://doi.org/10.1007/s00246-020-02480-2

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