Investigation of an appropriate contrast-enhanced CT protocol for young patients following the Fontan operation
Children with congenital heart diseases (CHDs) may need to be followed up with contrast-enhanced CT following the Fontan operation because complications such as the occlusion of conduits may occur. The purpose of the present study was to develop an adequate contrast-enhanced CT protocol for children with CHD following the Fontan operation.
Materials and methods
Between July 2012 and July 2017, 29 CT examinations for 26 patients aged 2–11 years (median 5 years) with CHD following the Fontan operation were performed using dual-source CT. A non-ionized contrast medium was injected through the dorsum manus vein. Scanning began 60 or 70 s after the start of the injection. The delayed phase was randomly selected to be 60 s in 14 cases and 70 s in 15 cases. We evaluated the enhancement of conduits following the Fontan operation at delayed phases.
The CT numbers of conduits at 60 and 70 s were 185 ± 46 and 185 ± 31 HU, respectively (P = 0.97).
In contrast-enhanced CT for children after the Fontan operation, both of the delayed phases (60 and 70 s) appeared to be adequate for evaluating intraconduit patency.
KeywordsCongenital heart disease Computed tomography Fontan operation
This work was supported by JSPS KAKENHI Grant number 16K19838.
M. Nakagawa received a research grant from JSPS KAKENHI (Grant number 16K19838).
Compliance with ethical standards
Conflict of interest
The other authors declare that they have no conflicts of interest.
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