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Cardoso MRR, Crestani AM, Souza AS, Braga FDCB, Brun MM, Murakami AN, Cajueiro FCM, Marchi CHD, Croti UA. Role of Computed Tomography Angiography in the Short-Term Follow-up of Aortic Coarctation Repair. Braz J Cardiovasc Surg 2024; 39:e20230220. [PMID: 38315562 PMCID: PMC10836914 DOI: 10.21470/1678-9741-2023-0220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 06/17/2023] [Indexed: 02/07/2024] Open
Abstract
INTRODUCTION Coarctation of the aorta (CoA) is a narrowing of the thoracic aorta that often manifests as discrete stenosis but may be tortuous or in long segment. The study aimed to evaluate pre and post-surgical aspects of pediatric patients submitted to CoA surgical correction and to identify possible predisposing factors for aortic recoarctation. METHODS Twenty-five patients were divided into groups according to presence (N=8) or absence (N=17) of recoarctation after surgical correction of CoA and evaluated according to clinical-demographic profile, vascular characteristics via computed angiotomography (CAT), and other pathological conditions. RESULTS Majority of males (64%), ≥ 15 days old (76%), ≥ 2.5 kg (80%). There was similarity between groups with and without recoarctation regarding sex (male: 87% vs. 53%; P=0.277), age (≥ 15 days: 62.5 vs. 82%; P=0.505), and weight (≥ 2.5 kg: 87.5 vs. 76.5; P=0,492). Altered values of aortic root/Valsalva diameter, proximal transverse arch, and distal isthmus, and normal values for aorta prevailed in preoperative CAT. Normal values for the aortic root/Valsalva sinus diameter were observed with and without recoarctation, the same for both groups regarding ascending and descending aorta in postoperative CAT. No significant difference for altered values of proximal transverse arch and alteration in distal isthmus was observed. CONCLUSION No predictive risk for recoarctation was observed. CTA proved to be important in CoA diagnosis and management, since CoA is mainly related with altered diameter of aortic root/sinus of Valsalva and proximal and distal aortic arch/isthmus, however, it failed to show predictive risk for recoarctation.
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Affiliation(s)
- Mariana Ribeiro Rodero Cardoso
- Radiology Service, Hospital da Criança e Maternidade (HCM),
Fundação Faculdade Regional de Medicina de São José do
Rio Preto (FUNFARME), Faculdade de Medicina de São José do Rio liPreto
(FAMERP), São José do Rio Preto, São Paulo, Brazil
| | - Ariela Maltarolo Crestani
- Radiology Service, Hospital da Criança e Maternidade (HCM),
Fundação Faculdade Regional de Medicina de São José do
Rio Preto (FUNFARME), Faculdade de Medicina de São José do Rio liPreto
(FAMERP), São José do Rio Preto, São Paulo, Brazil
| | - Antônio Soares Souza
- Radiology Service, Hospital da Criança e Maternidade (HCM),
Fundação Faculdade Regional de Medicina de São José do
Rio Preto (FUNFARME), Faculdade de Medicina de São José do Rio liPreto
(FAMERP), São José do Rio Preto, São Paulo, Brazil
| | - Fernanda Del Campo Braojos Braga
- Radiology Service, Hospital da Criança e Maternidade (HCM),
Fundação Faculdade Regional de Medicina de São José do
Rio Preto (FUNFARME), Faculdade de Medicina de São José do Rio liPreto
(FAMERP), São José do Rio Preto, São Paulo, Brazil
| | - Marília Maroneze Brun
- CardioPedBrasil® - Centro do Coração da
Criança, Hospital da Criança e Maternidade (HCM),
Fundação Faculdade Regional de Medicina de São José do
Rio Preto (FUNFARME), Faculdade de Medicina de São José do Rio Preto
(FAMERP), São José do Rio Preto, São Paulo, Brazil
| | - Alexandre Noboru Murakami
- Cardiology Surgery Department, Serviço de Cirurgia
Cardíaca do Norte do Paraná, Universidade Estadual de Londrina (UEL),
Londrina, Paraná, Brazil
| | - Francisco Candido Monteiro Cajueiro
- CardioPedBrasil® - Centro do Coração da
Criança, Hospital da Criança e Maternidade (HCM),
Fundação Faculdade Regional de Medicina de São José do
Rio Preto (FUNFARME), Faculdade de Medicina de São José do Rio Preto
(FAMERP), São José do Rio Preto, São Paulo, Brazil
| | - Carlos Henrique De Marchi
- CardioPedBrasil® - Centro do Coração da
Criança, Hospital da Criança e Maternidade (HCM),
Fundação Faculdade Regional de Medicina de São José do
Rio Preto (FUNFARME), Faculdade de Medicina de São José do Rio Preto
(FAMERP), São José do Rio Preto, São Paulo, Brazil
| | - Ulisses Alexandre Croti
- CardioPedBrasil® - Centro do Coração da
Criança, Hospital da Criança e Maternidade (HCM),
Fundação Faculdade Regional de Medicina de São José do
Rio Preto (FUNFARME), Faculdade de Medicina de São José do Rio Preto
(FAMERP), São José do Rio Preto, São Paulo, Brazil
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Leiner T, Bogaert J, Friedrich MG, Mohiaddin R, Muthurangu V, Myerson S, Powell AJ, Raman SV, Pennell DJ. SCMR Position Paper (2020) on clinical indications for cardiovascular magnetic resonance. J Cardiovasc Magn Reson 2020; 22:76. [PMID: 33161900 PMCID: PMC7649060 DOI: 10.1186/s12968-020-00682-4] [Citation(s) in RCA: 131] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 09/18/2020] [Indexed: 12/22/2022] Open
Abstract
The Society for Cardiovascular Magnetic Resonance (SCMR) last published its comprehensive expert panel report of clinical indications for CMR in 2004. This new Consensus Panel report brings those indications up to date for 2020 and includes the very substantial increase in scanning techniques, clinical applicability and adoption of CMR worldwide. We have used a nearly identical grading system for indications as in 2004 to ensure comparability with the previous report but have added the presence of randomized controlled trials as evidence for level 1 indications. In addition to the text, tables of the consensus indication levels are included for rapid assimilation and illustrative figures of some key techniques are provided.
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Affiliation(s)
- Tim Leiner
- Department of Radiology, E.01.132, Utrecht University Medical Center, Heidelberglaan 100, 3584CX, Utrecht, The Netherlands.
| | - Jan Bogaert
- Department of Radiology, University Hospitals Leuven, Leuven, Belgium
- Department of Imaging and Pathology, Catholic University Leuven, Herestraat 49, 3000, Leuven, Belgium
| | - Matthias G Friedrich
- Departments of Medicine and Diagnostic Radiology, McGill University, 1001 Decarie Blvd., Montreal, QC, H4A 3J1, Canada
| | - Raad Mohiaddin
- Department of Radiology, Royal Brompton Hospital, Sydney Street, Chelsea, London, SW3 6NP, UK
- National Heart and Lung Institute, Imperial College, South Kensington Campus, London, SW7 2AZ, UK
| | - Vivek Muthurangu
- Centre for Cardiovascular Imaging, Science & Great Ormond Street Hospital for Children, UCL Institute of Cardiovascular, Great Ormond Street, London, WC1N 3JH, UK
| | - Saul Myerson
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine, Oxford Centre for Clinical Magnetic Resonance Research (OCMR), University of Oxford, John Radcliffe Hospital, Oxford, OX3 9DU, UK
| | - Andrew J Powell
- Department of Cardiology, Boston Children's Hospital, 300 Longwood Avenue, Farley, 2nd Floor, Boston, MA, 02115, USA
- Department of Pediatrics, Harvard Medical School, 300 Longwood Avenue, Farley, 2nd Floor, Boston, MA, 02115, USA
| | - Subha V Raman
- Krannert Institute of Cardiology, Indiana University School of Medicine, 340 West 10th Street, Fairbanks Hall, Suite 6200, Indianapolis, IN, 46202-3082, USA
| | - Dudley J Pennell
- Royal Brompton Hospital, Sydney Street, Chelsea, London, SW3 6NP, UK
- Imperial College, South Kensington Campus, London, SW7 2AZ, UK
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Abstract
Aortic coarctation is a discrete narrowing of the thoracic aorta. In addition to anatomic obstruction, it can be considered an aortopathy with abnormal vascular properties characterized by stiffness and impaired relaxation. There are surgical and transcatheter techniques to address the obstruction but, despite relief, patients with aortic coarctation are at risk for hypertension, aortic complications, and abnormalities with left ventricular performance. This review covers the etiology, pathophysiology, diagnosis, and management of adults with aortic coarctation, with emphasis on multimodality imaging characteristics and lifelong surveillance to identify long-term complications.
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Affiliation(s)
- Yuli Y Kim
- Philadelphia Adult Congenital Heart Center, Perelman School of Medicine at the University of Pennsylvania, Penn Medicine and Children's Hospital of Philadelphia, Perelman Center for Advanced Medicine, 3400 Civic Center Boulevard, Philadelphia, PA 19104, USA.
| | - Lauren Andrade
- Philadelphia Adult Congenital Heart Center, Perelman School of Medicine at the University of Pennsylvania, Penn Medicine and Children's Hospital of Philadelphia, Perelman Center for Advanced Medicine, 3400 Civic Center Boulevard, Philadelphia, PA 19104, USA
| | - Stephen C Cook
- Adult Congenital Heart Disease Program, Congenital Heart Center, Helen DeVos Children's Hospital, Frederik Meijer Heart & Vascular Institute, Pediatrics and Human Development, Michigan State University, 25 Michigan Street NE Suite 4200, Grand Rapids, MI 49503, USA
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Wintersperger BJ, Theisen D, Reiser MF. [MRI for therapy control in patients with aortic isthmus stenosis]. Radiologe 2010; 51:23-30. [PMID: 21113572 DOI: 10.1007/s00117-010-1997-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Aortic isthmus stenosis is the most common congenital aortic anomaly and is often a problem for therapy surveillance. In addition to possible comorbidities (e.g. bicuspid aortic valve) it is accompanied by various middle and long-term complications depending on the primary choice of the therapeutic procedure. Magnetic resonance imaging (MRI) plays an important role for the mostly young patients in the control of the aortic isthmus stenosis and therapy because it is non-invasive and there is no X-ray exposure. Radiologists should be well-informed on the principles of the therapeutic procedure in order to be competent in the interpretation of MRI findings. Due to the continuous development of MRI technology, techniques for functional evaluation (e.g. dynamic MRA, 4D PC flow measurement) are increasingly becoming available in addition to high-resolution MR angiography (MRA), which could predict the risk of possible complications, such as aneurysms. However, in this aspect further studies are necessary. Interventional therapy with stents and stent grafts is often employed for the therapy of possible complications following an operation (aneurysms, restenosis) but because of massive metal artefacts the use of MRI is often sometimes severely limited.
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Affiliation(s)
- B J Wintersperger
- Klinikum der Ludwig-Maximilians-Universität München, Campus Großhadern, München, Deutschland.
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Abstract
While nonenhanced magnetic resonance (MR) angiographic methods have been available since the earliest days of MR imaging, prolonged acquisition times and image artifacts have generally limited their use in favor of gadolinium-enhanced MR angiographic techniques. However, the combination of recent technical advances and new concerns about the safety of gadolinium-based contrast agents has spurred a resurgence of interest in methods that do not require exogenous contrast material. After a review of basic considerations in vascular imaging, the established methods for nonenhanced MR angiographic techniques, such as time of flight and phase contrast, are considered and their advantages and disadvantages are discussed. This article then focuses on new techniques that are becoming commercially available, such as electrocardiographically gated partial-Fourier fast spin-echo methods and balanced steady-state free precession imaging both with and without arterial spin labeling. Challenges facing these methods and possible solutions are considered. Since different imaging techniques rely on different mechanisms of image contrast, recommendations are offered for which strategies may work best for specific angiographic applications. Developments on the horizon include techniques that provide time-resolved imaging for assessment of flow dynamics by using nonenhanced approaches.
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Affiliation(s)
- Mitsue Miyazaki
- Department of MRI, Toshiba Medical Research Institute USA, 990 Corporate Woods Pkwy, Vernon Hills, IL 60061, USA.
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Gaca AM, Jaggers JJ, Dudley LT, Bisset GS. Repair of Congenital Heart Disease: A Primer—Part 2. Radiology 2008; 248:44-60. [DOI: 10.1148/radiol.2481070166] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Hom JJ, Ordovas K, Reddy GP. Velocity-encoded Cine MR Imaging in Aortic Coarctation: Functional Assessment of Hemodynamic Events. Radiographics 2008; 28:407-16. [DOI: 10.1148/rg.282075705] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Hernández RJ, Sáez F. [Magnetic resonance imaging of the mediastinal vessels in pediatric patients]. RADIOLOGIA 2007; 49:311-21. [PMID: 17910864 DOI: 10.1016/s0033-8338(07)73785-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The appearance of new and better magnetic resonance imaging (MRI) techniques have made the MRI a very important imaging method for the evaluation of thoracic vessels in pediatrics. The 3D angio-MRI using GD is capable of clearly demonstrating the morphology of the aorta and pulmonary vessels. The MRI may significantly reduce the number of angiographies needed and, in some patients, may even provide additional information to the angiography.
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Affiliation(s)
- R J Hernández
- Sección de Radiología Pediátrica. Departamento de Radiología. University of Michigan Health System. C.S. Mott Children's Hospital. EE.UU.
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Eichhorn JG, Fink C, Delorme S, Hagl S, Kauczor HU, Ulmer HE. Magnetic resonance blood flow measurements in the follow-up of pediatric patients with aortic coarctation – A re-evaluation. Int J Cardiol 2006; 113:291-8. [PMID: 16377005 DOI: 10.1016/j.ijcard.2005.11.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2005] [Revised: 10/25/2005] [Accepted: 11/04/2005] [Indexed: 11/28/2022]
Abstract
BACKGROUND Previous studies have suggested the feasibility of a non-invasive quantification of vascular trans-stenotic pressure gradients (DeltaP) by phase-contrast MR imaging (PC-MRI). Our purpose was to assess the value of MRI estimated pressure gradients as a screening tool for assessing hemodynamically significant (re-)coarctation of the aorta (CoA) in pediatric patients. METHODS Forty-three patients (median age (range), 16 (5-25) years) with CoA (38 postoperative and 5 native) and clinically suspected hemodynamically significant stenosis underwent quantitative and semi-quantitative PC-MRI blood flow measurements and 3D MR-angiography, Doppler ultrasound (US) and conventional catheter angiography (CCA, n=20). Estimated DeltaP for each modality was correlated with percent stenosis. RESULTS The percent stenosis correlated only moderately with DeltaP(MRI) (r=0.55, p<0.001) and DeltaP(CCA) (r=0.48, p<0.001). Only moderate correlations were observed between DeltaP(MRI) vs. DeltaP(CCA) (r=0.54, p=0.02) and vs. DeltaP(US) (r=0.40, p=0.01). In contrast, semi-quantitative analysis of PC-MRI flow profiles predicted with good sensitivity (88%) and specificity (88%) who would be operated on. Thirteen patients met hemodynamic and percent stenosis criteria by CCA for surgical intervention. CONCLUSION Measured pressure gradients using PC-MRI should be used cautiously when assessing patients for recoarctation of the aorta. The analysis of blood flow profiles by PC-MRI might be a promising alternative in assessing the hemodynamic significance of CoA.
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Affiliation(s)
- Joachim G Eichhorn
- Department of Paediatric Cardiology, University Children's Hospital, Im Neuenheimer Feld 153, 69120 Heidelberg, Germany.
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Riehle TJ, Oshinski JN, Brummer ME, Favaloro-Sabatier J, Mahle WT, Fyfe DA, Kanter KR, Parks WJ. Velocity-encoded magnetic resonance image assessment of regional aortic flow in coarctation patients. Ann Thorac Surg 2006; 81:1002-7. [PMID: 16488710 DOI: 10.1016/j.athoracsur.2005.07.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2005] [Revised: 06/29/2005] [Accepted: 07/05/2005] [Indexed: 11/16/2022]
Abstract
BACKGROUND During primary coarctation repair, collateral blood vessels contribute significantly to distal perfusion. We sought to determine if velocity-encoded cine magnetic resonance imaging (VENC-MRI) could provide insight into anatomy and hemodynamics of collateral flow in patients with unrepaired coarctation. METHODS Sixteen patients (median age, 6.2 years; range, 1 to 18) with discrete coarctation (65% severe, 29% mild-moderate) and 10 controls (median age, 12.0 years; range, 9 to 15) without left-sided heart lesions were referred for cardiac MRI. Flow volumes were calculated from VENC-MRI images at the coarctation (proximal), diaphragm (distal), and midway between the two points (midpoint). A means model, repeated-measure analysis, was performed for volumes. RESULTS In coarctation patients, flow volumes increased by 59% (p = 0.0002) from coarctation to diaphragm, primarily between the proximal and midpoint sites (by 77%, p < 0.0001). In controls, flow volumes decreased by 11% along the entire aortic study length. Coarctation volumes were lower than controls by 54% (p = 0.0003) at the proximal site but showed no statistical difference at the midpoint or diaphragm. CONCLUSIONS Coarctation flow volumes maximally increase in the upper thoracic aorta, but approach normal flow volumes in the lower thoracic region. Arteries arising from mid and lower thoracic level, such as those supplying the anterior spinal cord, may have nearly normal flow if collaterals are present. Velocity-encoded MRI can evaluate flow in patients who have poor collateral circulation to improve surgical planning and decrease neurologic complications of coarctation repair.
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Pujadas S, Reddy GP, Weber O, Tan C, Moore P, Higgins CB. Phase contrast MR imaging to measure changes in collateral blood flow after stenting of recurrent aortic coarctation: Initial experience. J Magn Reson Imaging 2006; 24:72-6. [PMID: 16755530 DOI: 10.1002/jmri.20613] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
PURPOSE To assess the feasibility of using phase contrast magnetic resonance (PC-MR) imaging to measure the change in collateral blood flow early after stenting of aortic coarctation. MATERIALS AND METHODS A total of 10 consecutive patients with coarctation of the aorta underwent MR imaging, X-ray angiography, and stent placement. PC-MR at two sites in the descending aorta was performed before and early after stenting in order to estimate collateral inflow to the descending thoracic aorta. The collateral flow and collateral flow percentage before and after stent placement were compared. RESULTS Before stenting, the mean proximal aortic flow = 43.9 +/- 14.6 mL/second; mean distal flow = 54.2 +/- 10 mL/second; collateral flow = 10.2 +/- 6.8 mL/second; and collateral flow percentage = 30.1 +/- 27.9%. After stenting, the mean proximal aortic flow = 62.1 +/- 17.9 mL/second; mean distal flow = 60 +/- 19 mL/second; collateral flow = -1.9 +/- 3.7 mL/second; and collateral flow percentage = -3.3 +/- 6.8%. CONCLUSION PC-MR can be used to measure changes in collateral circulation after stent treatment of coarctation of the aorta.
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Affiliation(s)
- Sandra Pujadas
- Department of Radiology, University of California, San Francisco, San Francisco, California, USA.
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Russo V, Renzulli M, La Palombara C, Fattori R. Congenital diseases of the thoracic aorta. Role of MRI and MRA. Eur Radiol 2005; 16:676-84. [PMID: 16249863 DOI: 10.1007/s00330-005-0027-y] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2005] [Accepted: 09/01/2005] [Indexed: 10/25/2022]
Abstract
Aortic malformations may be associated with other congenital heart abnormalities or may present independently, as incidental findings in asymptomatic patients. For more than 30 years, conventional imaging techniques for detection and assessment of congenital anomalies of the aorta have been chest X-ray, echocardiography and angiography. In recent times, considerable interest in congenital aortic diseases has been shown, due to technical progresses of noninvasive imaging modalities. Among them, magnetic resonance imaging (MRI) almost certainly offers the greatest advantages, especially in young patients in which a radiation exposure must be avoided as much as possible. MRI provides an excellent visualization of vascular structures with a wide field of view, well suited for evaluation of the thoracic aorta malformations. With the implementation of magnetic resonance angiography (MRA) it is also possible to depict any relationship with supra-aortic or mediastinal vessels. Phase contrast technique allows identification of the hemodynamic significance of the aortic alteration. Some technical considerations, which include fast spin-echo, gradient-echo and, especially, MRA techniques with phase-contrast and contrast enhanced methods, are discussed and applied in the evaluation of congenital thoracic aorta diseases.
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Affiliation(s)
- Vincenzo Russo
- Department of Radiology, Cardiovascular Unit, Policlinico S. Orsola, Padiglione 21, Via Massarenti 9, 40131, Bologna, Italy
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Markle BM, Cross RR. Cross-sectional imaging in congenital anomalies of the heart and great vessels: magnetic resonance imaging and computed tomography. Semin Roentgenol 2004; 39:234-62. [PMID: 15143688 DOI: 10.1053/j.ro.2003.12.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Bruce M Markle
- Departments of Diagnostic Imaging and Radiology, Department of Pediatric Cardiology, Children's National Medical Center, 111 Michigan Ave., NW, Washington, DC 20010, USA
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Christenson JT, Sierra J, Didier D, Beghetti M, Kalangos A. Repair of aortic coarctation using temporary ascending to descending aortic bypass in children with poor collateral circulation. Cardiol Young 2004; 14:39-45. [PMID: 15237669 DOI: 10.1017/s1047951104001076] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Aortic coarctation can now be repaired surgically with excellent results. Even though rare, injury to the spinal cord resulting in paraplegia remains a major concern. Preoperative evaluation showing the absence of collateral circulation is valuable in order to introduce protective actions. This report describes our experience using a temporary bypass from the ascending to the descending aorta bypass in children undergoing surgical correction of aortic coarctation in the setting of poorly developed collateral circulation. Between 1990 and 2002, we undertook direct surgical repair in 56 patients with isolated aortic coarctation, 20 as neonates, 11 as infants, and 25 during childhood. From 1998 onwards, we introduced preoperative evaluation of the collateral circulation with magnetic resonance imaging. From that time, we placed a temporary bypass from the ascending to the descending aorta, using a polytetrafluoroethylene tube of 4 to 8 mm diameter, whenever distal pressures were shown to be 25 mmHg or less after test clamping, or when magnetic resonance imaging revealed absence of collateral circulation. We found excellent correlations between the direct intra-operative measurements of distal pressure and the findings at magnetic resonance imaging. Following introduction of the temporary bypass, we observed no neurological complications, nor were there any complications related to bypass. Freedom from restenosis was 96%. Preoperative magnetic resonance imaging, therefore, can accurately visualize poor collateral circulation in children with aortic coarctation. The use of a temporary bypass can possibly eliminate the risk of neurological sequels following direct repair of coarctation in children with poorly developed collateral circulation. The temporary bypass is both easy to apply and safe.
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Affiliation(s)
- Jan T Christenson
- Department of Cardiovascular Surgery, University Hospital of Geneva, Geneva, Switzerland.
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Abstract
Magnetic resonance imaging (MRI) is well suited for the noninvasive evaluation of the thoracic vasculature, and with improvements in scanner technology, the ability of MR to illustrate the thoracic vessels has significantly improved. Dedicated vascular software and pulse sequences have become commercially available, and fast imaging, in particular, has facilitated the time-efficient and comprehensive MR evaluation of most thoracic vascular lesions. Over the years, a host of black and bright blood MRI methods have evolved into practical tools for illustration of the thoracic vessels. As with other MR applications, successful vascular depiction relies significantly on the proper selection and prescription of imaging pulse sequences. In this article, these methods with their specific technical and practical pitfalls for thoracic magnetic resonance angiography (MRA) will be discussed. Current clinical indications for thoracic MRA will also be illustrated.
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Affiliation(s)
- Vincent B Ho
- Department of Radiology and Radiological Sciences, Uniformed Services University of the Health Sciences, Bethesda, MD, USA.
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Gilkeson RC, Ciancibello L, Zahka K. Pictorial essay. Multidetector CT evaluation of congenital heart disease in pediatric and adult patients. AJR Am J Roentgenol 2003; 180:973-80. [PMID: 12646439 DOI: 10.2214/ajr.180.4.1800973] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- R C Gilkeson
- Department of Radiology, University Hospitals of Cleveland, Case Western Reserve University Medical School, 11100 Euclid Ave., Cleveland, OH 44106, USA
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Abstract
Advances in technology have led to a changing role for MRI in the evaluation of the thoracic vasculature in children. MRI, especially with 3D gadolinium-enhanced MR angiography, can clearly demonstrate the morphology of the aortic and pulmonary vascular supply. In patients with nonvalvar obstructive lesions of the aorta (i.e., coarctation, interruption of the aortic arch, and supravalvar stenosis), MRI can reliably assess the site and extent of the obstruction. Similarly, MRI can depict the morphology of the central pulmonary arteries and aortopulmonary collateral vessels in patients with obstructive lesions of the pulmonary artery. MRI is also useful in assessing the course of the aorta and pulmonary arteries in patients with suspected vascular rings. The result is that MRI can supplement information obtained from echocardiography and angiography and reduce the need for angiography.
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Affiliation(s)
- Ramiro J Hernandez
- Department of Radiology, Section of Pediatric Radiology, C.S. Mott Children's Hospital F3503, University of Michigan Health System, 1500 East, Medical Center Drive, Ann Arbor, MI 48109-0252, USA.
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Holmqvist C, Ståhlberg F, Hanséus K, Hochbergs P, Sandström S, Larsson EM, Laurin S. Collateral flow in coarctation of the aorta with magnetic resonance velocity mapping: correlation to morphological imaging of collateral vessels. J Magn Reson Imaging 2002; 15:39-46. [PMID: 11793455 DOI: 10.1002/jmri.10036] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
PURPOSE To correlate quantification of collateral flow in aortic coarctation with the morphological visualization of the collateral vessels and to compare different approaches to measurement of collateral flow. MATERIALS AND METHODS Thirteen children with coarctation were examined with T1-weighted spin-echo (T1-W SE) imaging and 3D contrast-enhanced magnetic resonance angiography (MRA). MR velocity mapping was performed at four levels in the descending aorta. RESULTS The flow immediately above and below the coarctation did not differ significantly. Measuring within the coarctation resulted in flow overestimation. The increase of flow from proximal to distal aorta was 12 +/- 21% in patients with no or uncertain collaterals and 69 +/- 55% in patients with pronounced collaterals. Spin-echo images and MRA were comparable in visualizing collateral vessels. The visual estimation of collaterals correlated reasonably well with flow quantification MR velocity mapping. CONCLUSION Collateral flow assessment with MR velocity mapping is an accurate technique for evaluating the hemodynamic importance of a coarctation and is recommended if abundant collaterals are not visualized with spin echo or MRA.
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Affiliation(s)
- Catarina Holmqvist
- Diagnostic Center of Medical Imaging and Physiology, Lund University Hospital, Lund, Sweden.
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O'Connell MJ, Murray JG. Value of subtraction technique in Gd-DTPA-enhanced magnetic resonance angiography of the thoracic aorta. Clin Radiol 2001; 56:545-9. [PMID: 11446751 DOI: 10.1053/crad.2001.0699] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
AIM To assess routine image subtraction in 3D gadopentate dimeglumine (Gd-DTPA)-enhanced magnetic resonance (MR) angiography of the thoracic aorta. MATERIALS AND METHODS This was a prospective study of 22 consecutive patients referred for magnetic resonance imaging (MRI) of the thoracic aorta. All patients had 3D MR aortography (TR/TE/FA; 5/2 ms/25 degrees ) performed before and after bolus intravenous injection of Gd-DTPA. The Gd-DTPA enhanced and unenhanced data sets were subtracted and maximum intensity projections (MIP) projections of the thoracic aorta were performed. The standard unsubtracted MIP images were initially evaluated. These were then reviewed together with the subtracted images to assess for additional diagnostic information. Signal to noise ratios (SNR) and contrast to noise ratios (CNR) were measured. RESULTS In four cases there was mild image degradation due to patient movement. In no case did subtraction alter the diagnosis. The mean SNR in the unsubtracted MIP images was 10.8 +/- 4.0 (median 11.1) and on the subtracted images was 21.2 +/- 9.9 (median 20.7;P < 0.0001). The mean aorta-to-mediastinal fat CNR was 3.9 +/- 2.8 (median 3.9) on the unsubtracted images and 15.0 +/- 10.6 (median 13) on the subtracted images (P < 0.0001). The mean aorta-to-vertebral body CNR was 5.2 +/- 3.1 (median 4.4) on the unsubtracted images and 15.1 +/- 9.3 on the subtracted images (P < 0.0001). CONCLUSION Image subtraction significantly improved both the SNR and CNR, but did not alter the final diagnosis, and does not appear warranted in routine practice.
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Affiliation(s)
- M J O'Connell
- Department of Radiology, Mater Misericordiae Hospital, Dublin 7, Ireland.
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Abstract
With recent advances in the understanding of aortic diseases, both power and versatility have put magnetic resonance imaging (MRI) in the focus of diagnostic work-up in the entire spectrum of clinical aortic pathology. Technical refinements, from classic anatomic imaging to three-dimensional gadolinium-enhanced MR angiography and tissue characterization, have rendered MRI ideal for assessment of acquired disease such as aortic dissection, intramural hematoma, and aneurysm, along with postoperative follow-up evaluation, with better reliability and safety than other imaging modalities. Moreover, congenital pathology of the aorta, including aortic arch anomalies and coarctation, can be non-invasively evaluated by MRI. With spectroscopy and the advent of high-resolution intravascular coils, MRI may even provide histopathologic and potentially prognostic information unparalleled by any other method. J. Magn. Reson. Imaging 1999;10:741-750.
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Affiliation(s)
- R Fattori
- Department of Radiology, University Hospital S. Orsola, 40138 Bologna, Italy.
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Abstract
Coarctation of the aorta may seem to be a relatively simple lesion, but controversy persists about the optimal management strategy for this condition. A plethora of options are available, and strong evidence to guide clinical decision making is lacking. The age of the patient at presentation and anatomic variations have a significant effect on the type of therapy chosen and the outcome of intervention, which can include death, recurrence of obstruction, and persistent or late hypertension. The current trend in practice is to favor surgical repair in neonates and infants and transcatheter balloon dilation in older children and adults.
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Affiliation(s)
- B W McCrindle
- Department of Pediatrics, University of Toronto, Hospital for Sick Children, Ontario, Canada.
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