Comparing flow and pulmonary artery growth post-patent ductus arteriosus stenting in patients with ductal-dependent pulmonary flow using 4D magnetic resonance imaging

Author:

Al Kindi Faiza A1ORCID,Al Kindi Hamood2ORCID,Maddali Madan Mohan2ORCID,Al Farqani Abdullah2,Al Alawi Khalid2,Al Balushi Abdullah2,Al Ghafri Mohammed2,Khalil Sahar1,Kumar Satish3

Affiliation:

1. The Radiology Department, The Royal Hospital , P.O. Box 1331, Ghala St, 111 Muscat , Oman

2. The National Heart Center, The Royal Hospital , P.O. Box 393, 18 November St, 100 Muscat , Oman

3. Centre of Studies and Research, Ministry of Health , P.O. Box 393, 100 Muscat , Oman

Abstract

Abstract Aims The 4D magnetic resonance imaging (4D-flow MRI) provides a qualitative and quantitative assessment of cardiovascular structures and processes. 4D-flow MRI was used to study pulmonary flow in post-patent ductus arteriosus (PDA) stent insertion in duct-dependent pulmonary flow neonates at baseline (PDA stent insertion) and after 6 months, and also, to evaluate the effect of flow dynamics on the growth of pulmonary arteries (PAs). Methods and results This prospective observational study included neonates with ductus arteriosus-dependent pulmonary circulation who underwent ductal stenting between June 2021 and November 2022. Cardiac 4D-flow MRI and magnetic resonance angiography were conducted in two phases; after the deployment of the PDA stent during the neonatal period and after 6 months from stent deployment. Eight neonates were recruited, but only five completed both scans. A total of 10 PAs were evaluated during each phase. The median left PA (LPA) and right PA (RPA) diameters and indexed flow for LPA and RPA were evaluated. The growth rate of LPA was observed to be lower than that of RPA (percentage diameter increase: 74 vs. 153%). LPA Z-score was lower than RPA. Indexed flow in both LPA and RPA showed a reduction in the 6-month scan, which was consistent with reduced stent patency. Conclusion 4D-flow cardiac MRI showed different growth rates and reduced flow between LPA and RPA post-PDA stent. These insights can aid in future management decisions.

Funder

Ministry of Higher Education, Research and Innovation

Publisher

Oxford University Press (OUP)

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