Use of Cardiac Computed Tomography for Ventricular Volumetry in Late Postoperative Patients with Tetralogy of Fallot
Background: Cardiac computed tomography (CT) has emerged as an alternative to magnetic resonance imaging (MRI) for ventricular volumetry. However, the clinical use of cardiac CT requires external validation. Methods: Both cardiac CT and MRI were performed prior to pulmonary valve implantation (PVI...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Korean Society for Thoracic and Cardiovascular Surgery
2017-04-01
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| Series: | Korean Journal of Thoracic and Cardiovascular Surgery |
| Subjects: | |
| Online Access: | http://www.kjtcvs.org/journal/download_pdf.php?doi=10.5090/kjtcs.2017.50.2.71 |
| Summary: | Background: Cardiac computed tomography (CT) has emerged as an alternative to magnetic resonance imaging
(MRI) for ventricular volumetry. However, the clinical use of cardiac CT requires external validation.
Methods: Both cardiac CT and MRI were performed prior to pulmonary valve implantation (PVI) in 11 patients
(median age, 19 years) who had undergone total correction of tetralogy of Fallot during infancy. The
simplified contouring method (MRI) and semiautomatic 3-dimensional region-growing method (CT) were used
to measure ventricular volumes. Results: All volumetric indices measured by CT and MRI generally correlated
well with each other, except for the left ventricular end-systolic volume index (LV-ESVI), which showed the
following correlations with the other indices: the right ventricular end-diastolic volume index (RV-EDVI)
(r=0.88, p＜0.001), the right ventricular end-systolic volume index (RV-ESVI) (r=0.84, p=0.001), the left ventricular
end-diastolic volume index (LV-EDVI) (r=0.90, p=0.001), and the LV-ESVI (r=0.55, p=0.079). While the
EDVIs measured by CT were significantly larger than those measured by MRI (median RV-EDVI: 197 mL/m
2
vs. 175 mL/m
2
, p=0.008; median LV-EDVI: 94 mL/m
2
vs. 92 mL/m
2
, p=0.026), no significant differences were
found for the RV-ESVI or LV-ESVI. Conclusion: The EDVIs measured by cardiac CT were greater than those
measured by MRI, whereas the ESVIs measured by CT and MRI were comparable. The volumetric characteristics
of these 2 diagnostic modalities should be taken into account when indications for late PVI after tetralogy
of Fallot repair are assessed. |
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| ISSN: | 2233-601X 2093-6516 |