Four-Dimensional flow Magnetic Resonance Imaging for Assessment of Pediatric Coarctation of the Aorta

Lajja Desai*, Heather Stefek, Haben Berhane, Joshua Robinson, Cynthia Rigsby, Michael Markl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Background: Coarctation of the aorta (CoA) typically requires repair, but re-interventions and vascular complications occur, particularly with associated defects like bicuspid aortic valve (BAV). Magnetic resonance imaging (MRI) may identify anatomic and hemodynamic factors contributing to clinical complications. Purpose: To investigate 4D flow MRI characteristics in pediatric CoA to determine parameters for long-term clinical surveillance. Study Type: Retrospective. Population: CoA (n = 21), CoA with BAV (n = 24), BAV alone (n = 29), and healthy control (n = 25). Field Strength/Sequence: A 1.5 T, 3D CE IR FLASH MRA, 4D flow MRI using 3D time resolved PC-MRI with velocity encoding. Assessment: Thoracic aorta diameters were measured from 3D CE-MRA. Peak systolic velocities and wall shear stress were calculated and flow patterns were visualized throughout the thoracic aorta using 4D flow. Repair characteristics, re-interventions, and need for anti-hypertensive medications were recorded. Statistics: Descriptive statistics, ANOVA with post hoc t-testing and Bonferroni correction, Kruskal–Wallis H, intraclass correlation coefficient, Fleiss' kappa. Results: Patients with CoA with or without repair had smaller transverse arch diameters compared to BAV alone and control cohorts (P < 0.05), higher peak systolic flow velocities and wall shear stress compared to controls in the transverse arch and descending aorta (P < 0.05), and flow derangements in the descending aorta. The most common CoA repairs were extended end-to-end anastomosis (n = 22/45, 48.9%, age at repair 1 ± 2 years, seven re-interventions) and stent/interposition graft placement (n = 10/45, 22.2%, age at repair 12 ± 3 years, one re-intervention). Anti-hypertensive medications were prescribed to 33.3% (n = 15/45) of CoA and 34.4% of BAV alone patients (n = 10/29). Data Conclusions: Despite repair, CoA alters hemodynamics and flow patterns in the transverse arch and descending aorta. These findings may contribute to vascular remodeling and secondary complications. 4D flow MRI may be valuable in risk stratification, treatment selection and postintervention assessment. Long-term, prospective studies are warranted to correlate patient and MRI factors with clinical outcomes. Evidence Level: 3. Technical Efficacy: Stage 3.

Original languageEnglish (US)
Pages (from-to)200-208
Number of pages9
JournalJournal of Magnetic Resonance Imaging
Volume55
Issue number1
DOIs
StatePublished - Jan 2022

Keywords

  • 4D flow
  • cardiac
  • coarctation of the aorta
  • congenital heart disease
  • pediatrics

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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