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Nakamura K, Nakao M, Wakatabe M, Orii K, Nakajima T, Miyazaki S, Kunihara T. Changes in Internal Thoracic Artery Blood Flow According to the Degree of Stenosis of the Anterior Descending Branch of the Left Coronary Artery. Ann Thorac Cardiovasc Surg 2023; 29:29-39. [PMID: 36418107 PMCID: PMC9939674 DOI: 10.5761/atcs.oa.22-00153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
PURPOSE Computational fluid dynamics has enabled the evaluation of coronary flow reserve. The purpose of this study was to clarify the hemodynamic variation and reserve potential of the left internal thoracic artery (LITA). METHODS Four patients were selected on the basis of various native coronary stenosis patterns and graft design. The wall shear stress and oscillatory shear index were measured, and one patient was selected. Next, we created three hypothetical lesions with 75%, 90%, and 99% stenosis in front of the graft anastomosis, and compared the changes in LITA blood flow and coronary flow distribution. RESULTS In the 75% to 90% stenosis model, blood flow was significantly higher in the native coronary flow proximal to the coronary artery bypass anastomosis regardless of time phase. In the 99% stenosis model, blood flow from the LITA was significantly dominant compared to native coronary flow at the proximal site of anastomosis. The range of LITA flow variability was the largest at 99% stenosis, with a difference of 70 ml/min. CONCLUSION The 99% stenosis model showed the highest LITA flow. The range of LITA flow variability is large, suggesting that it may vary according to the rate of native coronary stenosis.
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Affiliation(s)
- Ken Nakamura
- Department of Cardiac Surgery, The Jikei University School of Medicine, Tokyo, Japan,Corresponding author: Ken Nakamura. Department of Cardiac Surgery, The Jikei University School of Medicine, 3-25-8, Nishi- shinbashi, Minato-ku, Tokyo 105-8461, Japan
| | - Mitsutaka Nakao
- Department of Cardiac Surgery, Saitama Cardiovascular and Respiratory Center, Kumagaya, Saitama, Japan
| | - Makoto Wakatabe
- Department of Cardiac Surgery, Saitama Cardiovascular and Respiratory Center, Kumagaya, Saitama, Japan
| | - Kouan Orii
- Department of Cardiac Surgery, Saitama Cardiovascular and Respiratory Center, Kumagaya, Saitama, Japan
| | - Takatomo Nakajima
- Department of Cardiology, Saitama Cardiovascular and Respiratory Center, Kumagaya, Saitama, Japan
| | | | - Takashi Kunihara
- Department of Cardiac Surgery, The Jikei University School of Medicine, Tokyo, Japan
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Park I, Choi KB, Ahn JH, Kim WS, Lee YT, Jeong DS. Impact of diabetes mellitus on long-term clinical and graft outcomes after off-pump coronary artery bypass grafting with pure bilateral skeletonized internal thoracic artery grafts. Cardiovasc Diabetol 2022; 21:243. [PMID: 36380349 PMCID: PMC9667562 DOI: 10.1186/s12933-022-01687-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 11/05/2022] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND The effect of diabetes mellitus (DM) on the long-term outcomes of coronary artery bypass graft (CABG) remained debatable and various strategies exist for CABG; hence, clarifying the effects of DM on CABG outcomes is difficult. The current study aimed to evaluate the effect of DM on clinical and graft-related outcomes after CABG with bilateral internal thoracic artery (BITA) grafts. METHODS From January 2001 to December 2017, 3395 patients who underwent off-pump CABG (OPCAB) with BITA grafts were enrolled. The study population was stratified according to preoperative DM. The primary endpoint was cardiac death and the secondary endpoints were myocardial infarction (MI), revascularization, graft failure, stroke, postoperative wound infection, and a composite endpoint of cardiac death, MI, and revascularization. Multiple sensitivity analyses, including Cox proportional hazard regression and propensity-score matching analyses, were performed to adjust baseline differences. RESULTS After CABG, the DM group showed similar rates of cardiac death, MI, or revascularization and lower rates of graft failure at 10 years (DM vs. non-DM, 19.0% vs. 24.3%, hazard ratio [HR] 0.711, 95% confidence interval [CI] 0.549-0.925; P = 0.009) compared to the non-DM group. These findings were consistent after multiple sensitivity analyses. In the subgroup analysis, the well-controlled DM group, which is defined as preoperative hemoglobin A1c (HbA1c) of < 7%, showed lower postoperative wound infection rates (well-controlled DM vs. poorly controlled DM, 3.7% vs. 7.3%, HR 0.411, 95% CI 0.225-0.751; P = 0.004) compared to the poorly controlled DM group, which was consistent after propensity-score matched analysis. CONCLUSIONS OPCAB with BITA grafts showed excellent and comparable long-term clinical outcomes in patients with and without DM. DM might have a protective effect on competition and graft failure of ITA. Strict preoperative hyperglycemia control with target HbA1c of < 7% might reduce postoperative wound infection and facilitate the use of BITA in CABG.
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Affiliation(s)
- Ilkun Park
- grid.414964.a0000 0001 0640 5613Department of Thoracic and Cardiovascular Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-Ro, Gangnam-Gu, Seoul, 06351 Republic of Korea
| | - Kuk Bin Choi
- grid.66875.3a0000 0004 0459 167XDepartment of Cardiovascular Surgery, Mayo Clinic, Rochester, Minnesota USA
| | - Joong Hyun Ahn
- grid.414964.a0000 0001 0640 5613Biostatistics and Clinical Epidemiology Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Wook Sung Kim
- grid.414964.a0000 0001 0640 5613Department of Thoracic and Cardiovascular Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-Ro, Gangnam-Gu, Seoul, 06351 Republic of Korea
| | - Young Tak Lee
- Department of Thoracic and Cardiovascular Surgery, Incheon Sejong Hospital, Incheon, Gyeonggi-Do Republic of Korea
| | - Dong Seop Jeong
- grid.414964.a0000 0001 0640 5613Department of Thoracic and Cardiovascular Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-Ro, Gangnam-Gu, Seoul, 06351 Republic of Korea
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Vesnina ZV, Grakova EV. Diagnostic radiology methods for assessing coronary artery bypass graft viability. BULLETIN OF SIBERIAN MEDICINE 2022. [DOI: 10.20538/1682-0363-2022-3-140-153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The review describes available modern radiological methods which are currently applied for a detailed and comprehensive anatomical and functional assessment of the viability of various coronary artery bypass grafts. In addition, it presents some aspects of the implementation of these methods and clinical interpretation of the results.
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Affiliation(s)
- Zh. V. Vesnina
- Cardiology Research Institute, Tomsk National Research Medical Center (NRMC), Russian Academy of Sciences
| | - E. V. Grakova
- Cardiology Research Institute, Tomsk National Research Medical Center (NRMC), Russian Academy of Sciences
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Qiao E, Wang Y, Yu J, Wang X, Luo X, Wang W. Short-term assessment of radial artery grafts with multidetector computed tomography. J Cardiothorac Surg 2021; 16:93. [PMID: 33865411 PMCID: PMC8052742 DOI: 10.1186/s13019-021-01465-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 04/05/2021] [Indexed: 12/05/2022] Open
Abstract
Background The clinical use of the radial artery (RA) in coronary artery bypass grafting (CABG) is still limited worldwide, although it has been recommended by several guidelines. Multidetector computed tomography (MDCT) is widely used to evaluate graft patency, as invasive coronary angiography could cause potentially serious risks including bleeding, dissection and stroke. This study aims to report the short-term results of the RA in CABG with MDCT. Methods The study population consists of 41 consecutive patients undergoing elective CABG with the RA graft between 2017 to 2018, with MDCT performed to evaluate graft patency during follow-up, and target vessels for the RA were non-left anterior descending coronary arteries with > 70% stenosis. Results A total of 150 grafts were assessed by MDCT during follow-up (mean, 8.9 ± 5.1 months). MDCT could clearly show the structure and patency of grafts, even for complex coronary artery revascularization. Graft patency of the left internal mammary artery was 92.9% (39/42), with the RA patency of 84.4% (38/45) and the patency of the saphenous vein graft of 81.1% (30/37). And the RA anastomosed to the left coronary artery system might have better patency than the RA anastomosed to the right coronary artery system (25/29, 86.2% vs 13/16, 81.3%, p = 0.686). Conclusions The short-term patency rate of RA grafts is good, and the RA might be associated with better patency when anastomosed to the left but not the right coronary artery. MDCT could provide excellent visualization of grafts in CABG.
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Affiliation(s)
- En Qiao
- Structural Heart Disease Center, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishi Road, Xicheng District, Beijing, 100037, China
| | - Yuetang Wang
- Structural Heart Disease Center, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishi Road, Xicheng District, Beijing, 100037, China
| | - Jun Yu
- Structural Heart Disease Center, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishi Road, Xicheng District, Beijing, 100037, China
| | - Xu Wang
- Structural Heart Disease Center, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishi Road, Xicheng District, Beijing, 100037, China
| | - Xinjin Luo
- Structural Heart Disease Center, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishi Road, Xicheng District, Beijing, 100037, China
| | - Wei Wang
- Structural Heart Disease Center, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences, Peking Union Medical College, 167 Beilishi Road, Xicheng District, Beijing, 100037, China.
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Lachhab F, Amri R, Mahfoudi L, Moughil S. Abnormal Origin of the Left Coronary Artery From the Pulmonary Artery Discovered at Age 67: What to Do? World J Pediatr Congenit Heart Surg 2018; 11:NP207-NP209. [DOI: 10.1177/2150135118772834] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Anomalous left coronary artery from the pulmonary artery (ALCAPA) was described by Abbott in 1908. In most cases, it is an isolated lesion, being the most common cause of myocardial ischemia in children. The associated mortality rate without intervention reaches 90% during childhood. We report the case of a 67-year-old woman, who underwent coronary angiography for investigation of atypical chest pain and was found to have ALCAPA. The patient refused surgery and has remained asymptomatic on a medical regimen.
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Affiliation(s)
- Fadoua Lachhab
- Department of Cardiovascular Surgery B, Mohammed V University, Rabat, Morocco
| | - Rachida Amri
- Department of Cardiovascular Surgery B, Mohammed V University, Rabat, Morocco
- Department of Cardiology B, Mohammed V University, Rabat, Morocco
| | - Loubna Mahfoudi
- Department of Cardiovascular Surgery B, Mohammed V University, Rabat, Morocco
| | - Said Moughil
- Department of Cardiovascular Surgery B, Mohammed V University, Rabat, Morocco
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Pellicano M, De Bruyne B, Toth GG, Casselman F, Wijns W, Barbato E. Fractional flow reserve to guide and to assess coronary artery bypass grafting. Eur Heart J 2018; 38:1959-1968. [PMID: 28025191 DOI: 10.1093/eurheartj/ehw505] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 09/30/2016] [Indexed: 11/14/2022] Open
Abstract
The aim of this review is to highlight the role of invasive functional evaluation in patients in whom coronary artery bypass graft (CABG) is indicated, and to examine the clinical evidence available in favour of fractional flow reserve (FFR) adoption in these patients, outline appropriate use, as well as point out potential pitfalls. FFR after CABG will also be reviewed, highlighting its correct interpretation and adoption when applied to both native coronary arteries and bypass grafts. Practice European guidelines support the use of FFR to complement coronary angiography with the highest degree of recommendation (Class IA) for the assessment of coronary stenosis before undertaking myocardial revascularization when previous non-invasive functional evaluation is unavailable or not conclusive. As a result, FFR has been adopted in routine clinical practice to guide clinicians decision as to whether or not perform a revascularization. Of note, due to the increasing confidence of the interventional cardiologists, FFR guidance is also being implemented to indicate or guide CABG. This is in anticipation of supportive clear-cut evidence, since recommendations for FFR adoption were based on randomized clinical trials investigating percutaneous coronary intervention (PCI) strategies in which patients with typical indications for CABG were excluded (e.g. left main disease, valvular disease, and coronary anatomy unsuitable for PCI). Based on the critical appraisal of the literature, FFR can play an important role in risk stratification and determining management strategy of patients either before or after CABG.
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Affiliation(s)
- Mariano Pellicano
- Cardiovascular Research Center Aalst, OLV Clinic, Moorselbaan n 164, B 9300 Aalst, Belgium.,Division of Cardiology, Department of Advanced Biomedical Sciences, University of Naples Federico II, Naples, Italy
| | - Bernard De Bruyne
- Cardiovascular Research Center Aalst, OLV Clinic, Moorselbaan n 164, B 9300 Aalst, Belgium
| | - Gabor G Toth
- Cardiovascular Research Center Aalst, OLV Clinic, Moorselbaan n 164, B 9300 Aalst, Belgium.,University Heart Center Graz, Medical University Graz, Graz, Austria
| | - Filip Casselman
- Cardiovascular Research Center Aalst, OLV Clinic, Moorselbaan n 164, B 9300 Aalst, Belgium
| | - William Wijns
- Cardiovascular Research Center Aalst, OLV Clinic, Moorselbaan n 164, B 9300 Aalst, Belgium.,The Lambe Institute for Translational Medicine and Curam, National University of Ireland, Galway and Saolta University Healthcare Group, Galway, Ireland
| | - Emanuele Barbato
- Cardiovascular Research Center Aalst, OLV Clinic, Moorselbaan n 164, B 9300 Aalst, Belgium.,Division of Cardiology, Department of Advanced Biomedical Sciences, University of Naples Federico II, Naples, Italy
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Influence of Diabetes on Long-Term Coronary Artery Bypass Graft Patency. J Am Coll Cardiol 2017; 70:515-524. [DOI: 10.1016/j.jacc.2017.05.061] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 05/30/2017] [Accepted: 05/31/2017] [Indexed: 11/20/2022]
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Samak M, Fatullayev J, Sabashnikov A, Zeriouh M, Schmack B, Ruhparwar A, Karck M, Popov AF, Dohmen PM, Weymann A. Total Arterial Revascularization: Bypassing Antiquated Notions to Better Alternatives for Coronary Artery Disease. Med Sci Monit Basic Res 2016; 22:107-114. [PMID: 27698339 PMCID: PMC5063431 DOI: 10.12659/msmbr.901508] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Total arterial revascularization is the leading trend in coronary artery bypass grafting (CABG) for the treatment of coronary artery disease (CAD). Adding to its superiority to vein conduits, arteries allow for a high degree of versatility and long-term patency, while minimizing the need for reintervention. This is especially important for patients with multi-vessel coronary artery disease, as well as young patients. However, arterial revascularization has come a long way before being widely appreciated, with some yet unresolved debates, and advances that never cease to impress. In this review, we discuss the evolution of this surgical technique and its clinical success, as well as its most conspicuous limitations in light of accumulated published date from decades of experience.
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Affiliation(s)
- Mostafa Samak
- Department of Cardiac Surgery, University Hospital Oldenburg, European Medical School Oldenburg-Groningen, Carl von Ossietzky University Oldenburg, Oldenburg, Germany
| | - Javid Fatullayev
- Department of Cardiothoracic Surgery, Heart Center, University Hospital Cologne, Cologne, Germany
| | - Anton Sabashnikov
- Department of Cardiothoracic Surgery, Heart Center, University Hospital Cologne, Cologne, Germany
| | - Mohamed Zeriouh
- Department of Cardiothoracic Surgery, Heart Center, University Hospital Cologne, Cologne, Germany
| | - Bastian Schmack
- Department of Cardiothoracic Transplantation & Mechanical Circulatory Support, Royal Brompton and Harefield NHS Foundation Trust, Harefield, Middlesex, London, United Kingdom
| | - Arjang Ruhparwar
- Department of Cardiac Surgery, Heart and Marfan Center, University of Heidelberg, Heidelberg, Germany
| | - Matthias Karck
- Department of Cardiac Surgery, Heart and Marfan Center, University of Heidelberg, Heidelberg, Germany
| | - Aron-Frederik Popov
- Department of Cardiothoracic Transplantation & Mechanical Circulatory Support, Royal Brompton and Harefield NHS Foundation Trust, Harefield, Middlesex, London, United Kingdom
| | - Pascal M Dohmen
- Department of Cardiac Surgery, University Hospital Oldenburg, European Medical School Oldenburg-Groningen, Carl von Ossietzky University Oldenburg, Oldenburg, Germany
| | - Alexander Weymann
- Department of Cardiac Surgery, University Hospital Oldenburg, European Medical School Oldenburg-Groningen, Carl von Ossietzky University Oldenburg, Oldenburg, Germany
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Concomitant grafting of both postbifurcation internal thoracic artery branches. INNOVATIONS-TECHNOLOGY AND TECHNIQUES IN CARDIOTHORACIC AND VASCULAR SURGERY 2015; 10:14-20. [PMID: 25587915 DOI: 10.1097/imi.0000000000000113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE We aimed to assess the clinical outcome and graft patency after concomitant grafting of both postbifurcation internal thoracic artery (ITA) branches. METHODS Between 2007 and 2013, 17 patients (14 men; mean [SD] age, 60 [9.3] years) underwent skeletonized bifurcated ITA grafting. Respective targets were restricted to non-left anterior descending (LAD) area. In all patients, a complementary standard ITA was used to graft the LAD artery. Graft patency was assessed by standard coronary angiography or serial multidetector computed tomography. RESULTS Of the bifurcated conduits, 94% were right ITA. Respective right ITA target sets were first and second obtuse marginal arteries (M1-M2) (n = 12), ramus-M1 (n = 2), and distal right coronary artery-posterior descending artery (n = 2). Right ITAs were mobilized retroaortic (via the transverse sinus) in 14 patients (82%) (to circumflex artery targets). Circumflex artery targets comprised 88.2% of all anastomoses (30/34). There were no early mortalities, myocardial infarctions, or hypoperfusion syndromes. During median follow-up of 44 months (range, 3-63), there was no late mortality. Overall reintervention rate was 11.7%, and bifurcated ITA-related reintervention rate was 5.8%. At 5 years, freedom from major adverse cardiac or cerebrovascular event related to bifurcated ITA respective territory was 87% (Kaplan-Meier). Coronary imaging was achieved in 76% of the patients (elective multidetector computed tomography, n = 9; symptoms-directed coronary catheterization, n = 4). Bifurcation branch patency rate was 88.4% (23/26) at a median of 3.5 years. CONCLUSIONS Grafting both postbifurcation ITA branches is technically feasible and may be selectively considered. Current observations are valid for skeletonized conduits and limited to non-LAD targets. These preliminary findings should be corroborated by larger data sets.
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Sahar G, Wolak A, Matsa M, Shelef I, Raichel L, Ishay Y, Lev-Ran O. Concomitant Grafting of Both Postbifurcation Internal Thoracic Artery Branches. INNOVATIONS-TECHNOLOGY AND TECHNIQUES IN CARDIOTHORACIC AND VASCULAR SURGERY 2015. [DOI: 10.1177/155698451501000102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Gideon Sahar
- Department of Cardiothoracic Surgery, and Soroka University Medical Center, Beer-Sheva, Israel
| | - Arik Wolak
- Cardiac Imaging Service, Soroka University Medical Center, Beer-Sheva, Israel
| | - Menachem Matsa
- Department of Cardiothoracic Surgery, and Soroka University Medical Center, Beer-Sheva, Israel
| | - Ilan Shelef
- Cardiac Imaging Service, Soroka University Medical Center, Beer-Sheva, Israel
| | - Lior Raichel
- Department of Cardiothoracic Surgery, and Soroka University Medical Center, Beer-Sheva, Israel
| | - Yaron Ishay
- Department of Cardiothoracic Surgery, and Soroka University Medical Center, Beer-Sheva, Israel
| | - Oren Lev-Ran
- Department of Cardiothoracic Surgery, and Soroka University Medical Center, Beer-Sheva, Israel
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Koyama S, Itatani K, Yamamoto T, Miyazaki S, Kitamura T, Taketani T, Ono M, Miyaji K. Optimal bypass graft design for left anterior descending and diagonal territory in multivessel coronary disease. Interact Cardiovasc Thorac Surg 2014; 19:406-13. [PMID: 24893870 DOI: 10.1093/icvts/ivu182] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES Coronary artery bypass grafting for multivessel disease requires an appropriate graft design to avoid the competition of flow between the graft and the native vessel in order to achieve a sufficient coronary flow and durable graft patency. METHODS Three-dimensional computational models of the left coronary artery were created based on the angiographic data. Three stenosis patterns of 75 and 90% combinations were created in the left anterior descending artery (LAD), the diagonal branch (Dx) and the circumflex artery (LCx). The left internal thoracic artery (LITA) was anastomosed to the LAD, and separate saphenous vein grafts (SVGs) were anastomosed to the Dx and the LCx in the 'Independent' model. The 'Sequential' model included sequential SVG anastomoses to the Dx and the LCx with a left internal thoracic artery-left anterior descending artery bypass, and Y-composite arterial grafts to LAD and Dx were created in the 'Composite' model. RESULTS The 'Independent' model had high reverse flow from the Dx to the LAD in systole, resulting in decreased LITA flow when Dx stenosis was mild. The 'Sequential' model also had reverse flow in diastole, resulting in additional LAD flow. The 'Composite' model distributed increased flow to the Dx when Dx stenosis was severe, resulting in decreased flow to the LAD. CONCLUSIONS Systematic flow evaluation is beneficial for determining the optimal bypass graft arrangement in patients with multivessel disease. Individual SVG anastomoses to the Dx and the LCx are not desirable when Dx stenosis is not severe and a Y-composite arterial graft to the LAD and the Dx is not desirable when Dx stenosis is severe.
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Affiliation(s)
- Sachi Koyama
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan Department of Cardiac Surgery, Graduate School of Medicine, The University of Tokyo, Bunkyo, Tokyo, Japan
| | - Keiichi Itatani
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan Department of Hemodynamic Analysis, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
| | - Tadashi Yamamoto
- Department of Cardiology, Hokkaido Cardiovascular Hospital, Hokkaido, Japan
| | - Shohei Miyazaki
- Department of Hemodynamic Analysis, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
| | - Tadashi Kitamura
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
| | - Tuyoshi Taketani
- Department of Cardiovascular Surgery, Mitsui Memorial Hospital, Chiyoda, Tokyo, Japan
| | - Minoru Ono
- Department of Cardiac Surgery, Graduate School of Medicine, The University of Tokyo, Bunkyo, Tokyo, Japan
| | - Kagami Miyaji
- Department of Cardiovascular Surgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
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Hsieh IC, Lin PJ, Chang SH, Hsieh MJ, Lin FC, Wu D, Chen CC. Dual protection therapy with staged coronary artery bypass surgery and stenting in patients with left main coronary artery stenosis: long-term results from a single center. Heart Surg Forum 2014; 17:E47-53. [PMID: 24631991 DOI: 10.1532/hsf98.2013282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE We evaluated the efficacy and safety of dual protection therapy with staged coronary artery bypass grafting (CABG) and bare-metal stenting (BMS) in patients with left main coronary artery (LMCA) disease. BACKGROUND CABG is currently the preferred therapy for complex LMCA disease; however, the long-term patency rates of these grafts are unsatisfactory, and stenting alone for LMCA may be associated with the potentially fatal consequences of stent thrombosis or restenosis. METHODS Between January 1997 and October 2005, 42 patients underwent staged bypass surgery and BMS, with the latter procedure performed 2 weeks after the initial CABG. Of these patients, 40 received left internal mammary artery (LIMA) grafts, 34 saphenous vein grafts, 6 radial artery grafts, and 3 right IMA (RIMA) grafts. Minimally invasive bypass surgery was performed in 10 patients. RESULTS There were no operative complications. Forty-two stents were implanted in 42 lesions without complications. During the follow-up period of 135 ± 55 months, 1 patient died of cancer, 2 of cardiac causes, and 5 patients (12%) experienced target lesion revascularization. The target vessel failure rate was 24%. Forty patients (95%) underwent a 6-month angiographic follow-up. Restenosis was noted in 7 patients (18%). Reocclusion was also noted in 5 LIMA grafts, 5 saphenous vein grafts, 1 radial artery graft, and 1 RIMA graft. Only 1 patient experienced both restenosis of LM stenting and total occlusion of the 2 bypass grafts. CONCLUSIONS Dual protection therapy with staged CABG and stenting is not an appropriate therapeutic strategy because of unacceptable graft patency rate. A higher occlusive rate of the bypass grafts may result from decreased blood flow because of competing blood flow between the bypass graft and the native coronary vessel.
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Affiliation(s)
- I-Chang Hsieh
- Section of Cardiology, Department of Internal Medicine and Percutaneous Coronary Intervention (PCI) Center, Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Pyng-Jing Lin
- Department of Cardiovascular Surgery, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Shang-Hung Chang
- Section of Cardiology, Department of Internal Medicine and Percutaneous Coronary Intervention (PCI) Center, Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Ming-Jer Hsieh
- Section of Cardiology, Department of Internal Medicine and Percutaneous Coronary Intervention (PCI) Center, Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Fen-Chiung Lin
- Section of Cardiology, Department of Internal Medicine and Percutaneous Coronary Intervention (PCI) Center, Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Delon Wu
- Section of Cardiology, Department of Internal Medicine and Percutaneous Coronary Intervention (PCI) Center, Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Chun-Chi Chen
- Section of Cardiology, Department of Internal Medicine and Percutaneous Coronary Intervention (PCI) Center, Chang Gung University College of Medicine, Taoyuan, Taiwan
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Wasilewski J, Mirota K, Hawranek M, Poloński L. Invasive and non-invasive fractional flow reserve index in validation of hemodynamic severity of intracoronary lesions. ADVANCES IN INTERVENTIONAL CARDIOLOGY 2013; 9:160-9. [PMID: 24570710 PMCID: PMC3915971 DOI: 10.5114/pwki.2013.35452] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2012] [Revised: 03/25/2013] [Accepted: 04/22/2013] [Indexed: 01/17/2023] Open
Abstract
This review discusses visual and functional evaluation of the hemodynamic significance of the degree of stenosis in coronary angiography, with respect to the indications for revascularization. The concept of the coronary flow reserve is defined, and the theoretical assumptions of the invasive measurement of the fractional flow reserve (FFR) are presented. In the following part, the publication describes the basic steps of numerical stimulations in terms of computational fluid dynamics (CFD) in calculating the fractional flow reserve based on computed tomography (CT) coronary angiography (FFRCT). The numerical FFRCT estimation in correlation with invasive measurements, as well as benefits deriving from FFRCT in the diagnosis of coronary artery disease, is presented in the example of the multicentre prospective DISCOVER-FLOW trial and the DeFACTO project. The CDF method enables to obtain hemodynamic significance of stenosis solely from the coronary anatomy vizualized by CT angiography. The calculation of FFRCT increases the diagnostic reliability of coronary flow reserve estimations. It contributes to the improvement in patients' qualification for contrast coronarography. If the accuracy of FFRCT is confirmed in clinical practice, and the time required for computational processing is shortened, it may turn out that the algorithms of coronary heart disease diagnosis will be verified and it will be to a greater extent based on the CT results.
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Affiliation(s)
- Jarosław Wasilewski
- 3 Department of Cardiology, Silesian Center for Heart Diseases, Medical University of Silesia, Zabrze, Poland
| | | | - Michał Hawranek
- 3 Department of Cardiology, Silesian Center for Heart Diseases, Medical University of Silesia, Zabrze, Poland
| | - Lech Poloński
- 3 Department of Cardiology, Silesian Center for Heart Diseases, Medical University of Silesia, Zabrze, Poland
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Bockeria LA, Sukhanov SG, Orekhova EN, Shatakhyan MP, Korotayev DA, Sternik L. Results of coronary artery bypass grafting in myocardial bridging of left anterior descending artery. J Card Surg 2013; 28:218-21. [PMID: 23574298 DOI: 10.1111/jocs.12101] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND We aimed to evaluate the graft patency rate following coronary artery bypass grafting (CABG) to the left anterior descending artery (LAD) with proximal myocardial bridging (MB). While MB is generally a benign coronary abnormality, ischemia, stunning, and sudden death have been reported. In symptomatic patients with proximal LAD systolic compression of >50%, positive for ischemic noninvasive testing and noneffective optimal medical therapy, coronary intervention could be indicated. Few studies of CABG in myocardial bridging have been reported. The influence of high flow in coronaries with MB on graft patency is cause for concern. METHODS We retrospectively studied 39 patients operated on for isolated MB of proximal LAD with >50% systolic compression. All patients were severely symptomatic despite optimal medical therapy and positive noninvasive tests for myocardial ischemia. CABG was performed through the midsternotomy with cardiopulmonary bypass and cardioplegia. Patients were divided into two groups: in 20 patients, LAD was bypassed with left internal mammary artery (LIMA) (Group 1) and in 19 patients with saphenous vein graft (SVG) (Group 2). All patients underwent follow-up coronary angiography. RESULTS Demographics and degree of systolic compression of the LAD were similar in both groups. There was no mortality or major morbidity. Freedom from angina was 68% in Group 1 and 94% in Group 2 at 18 months postoperatively (p = 0.58). Twelve LIMA grafts and three SVGs were found occluded (p = 0.002). CONCLUSIONS LIMA patency in myocardial bridging of the LAD can be low. SVGs should be considered in cases of CABG for myocardial bridging.
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Affiliation(s)
- Leo A Bockeria
- Bakoulev Scientific Center for Cardiovascular Surgery, Moscow, Russia
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15
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Abstract
PURPOSE OF REVIEW Competition flow is a common finding in arterial grafting. This phenomenon can lead to graft occlusion. RECENT FINDINGS Internal thoracic arteries are the best equipped arterial conduit to withstand the competition flow thanks to their endothelial function. Radial as well as right gastroepiploic arteries support much less flow competition because of their different anatomy, histology and endothelial function than that of internal thoracic artery, leading to spasm and occlusion. Therefore, these two arterial conduits should be used only in case of critical lesion to avoid graft occlusion. Saphenous vein graft is the only conduit that is not significantly affected by flow competition, mainly because of its nonresistivity and common reimplantation in the aorta. Graft configuration is the second important factor influencing the equation between graft flow and native coronary flow. Therefore, composite grafting should be reserved for the case of severely stenotic coronary target, especially if multiple arterial sequential anastomoses have to be performed on the lateral-inferior wall of the heart. Finally, an accurate tool such as the fractional flow reserve to evaluate the stenosis severity should be the milestone of coronary surgery in order to decrease the rate of flow competition and improve arterial grafting functionality. CONCLUSION Competition flow plays a crucial role in arterial grafting functionality. Grafting strategy should address this by appropriate graft choice and configuration in order to avoid graft attrition.
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Hillis LD, Smith PK, Anderson JL, Bittl JA, Bridges CR, Byrne JG, Cigarroa JE, Disesa VJ, Hiratzka LF, Hutter AM, Jessen ME, Keeley EC, Lahey SJ, Lange RA, London MJ, Mack MJ, Patel MR, Puskas JD, Sabik JF, Selnes O, Shahian DM, Trost JC, Winniford MD. 2011 ACCF/AHA Guideline for Coronary Artery Bypass Graft Surgery. A report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Developed in collaboration with the American Association for Thoracic Surgery, Society of Cardiovascular Anesthesiologists, and Society of Thoracic Surgeons. J Am Coll Cardiol 2011; 58:e123-210. [PMID: 22070836 DOI: 10.1016/j.jacc.2011.08.009] [Citation(s) in RCA: 576] [Impact Index Per Article: 44.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Hillis LD, Smith PK, Anderson JL, Bittl JA, Bridges CR, Byrne JG, Cigarroa JE, Disesa VJ, Hiratzka LF, Hutter AM, Jessen ME, Keeley EC, Lahey SJ, Lange RA, London MJ, Mack MJ, Patel MR, Puskas JD, Sabik JF, Selnes O, Shahian DM, Trost JC, Winniford MD, Winniford MD. 2011 ACCF/AHA Guideline for Coronary Artery Bypass Graft Surgery: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Circulation 2011; 124:e652-735. [PMID: 22064599 DOI: 10.1161/cir.0b013e31823c074e] [Citation(s) in RCA: 390] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Zacho M, Damgaard S, Lilleoer NT, Kelbaek H, Steinbrüchel D, Nielsen MB, Kofoed KF. Long-term internal thoracic artery bypass graft patency and geometry assessed by multidetector computed tomography. Int J Cardiovasc Imaging 2011; 28:1577-83. [DOI: 10.1007/s10554-011-9962-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Accepted: 10/07/2011] [Indexed: 10/16/2022]
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19
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Takagi Y, Akita K, Kondo H, Ishida M, Kaneko K, Sato M, Ando M. Non-invasive evaluation of internal thoracic artery anastomosed to the left anterior descending artery with 320-detector row computed tomography and adenosine thallium-201 myocardial perfusion scintigraphy. Ann Thorac Cardiovasc Surg 2011; 18:24-30. [PMID: 21881340 DOI: 10.5761/atcs.oa.11.01684] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
PURPOSE We evaluated the relationship between internal thoracic artery (ITA) stenosis anastomosed to the left anterior descending artery (LAD) and the degree of LAD stenosis using 320-detector row computed tomography (320-ADCT) and adenosine thallium-201 myocardial perfusion scintigraphy (Tl-201-MPS). METHODS We included 101 patients who underwent coronary artery bypass grafting (CABG) using ITA grafts; 320-ADCT and adenosine Tl-201-MPS were performed 2-3 months after CABG. Clinical parameters, degree of LAD stenosis, and regional myocardial ischemia of the LAD territory were compared between patients without ITA stenosis (Group A) and with ITA stenosis (Group B). RESULTS Thirty patients (30%) had ≤75% LAD stenosis, and 9 patients (30%) showed significant ITA stenosis. Regional ischemia was noted in 23 patients (23%). There were no differences in clinical parameters between the 2 groups. Twenty-two patients (24%) in Group A and 8 patients (89%) in Group B had ≤75% LAD stenosis (P <0.002). No Group B patients had regional myocardial ischemia of the LAD territory. CONCLUSION We concluded that ≤75% LAD stenosis significantly influences ITA stenosis, without associated regional myocardial ischemia of the LAD territory. Non-invasive 320-ADCT and adenosine Tl-201-MPS for ITA evaluation may be useful for long-term follow-up of patients after CABG.
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Affiliation(s)
- Yasushi Takagi
- Department of Cardiovascular Surgery, Fujita Health University, Dengakugakubo, Kutukake-cho, Toyoake, Aichi, Japan.
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Manabe S, Fukui T, Tabata M, Shimokawa T, Morita S, Takanashi S. Arterial graft deterioration one year after coronary artery bypass grafting. J Thorac Cardiovasc Surg 2010; 140:1306-11. [DOI: 10.1016/j.jtcvs.2010.01.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Revised: 11/26/2009] [Accepted: 01/01/2010] [Indexed: 11/27/2022]
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Yi G, Youn YN, Song SW, Yoo KJ. Off-Pump Right Coronary Artery Bypass With Saphaneous Vein or In-Situ Right Internal Thoracic Artery. Ann Thorac Surg 2010; 89:717-22. [DOI: 10.1016/j.athoracsur.2009.12.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2009] [Revised: 11/25/2009] [Accepted: 12/01/2009] [Indexed: 10/19/2022]
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22
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Yilmaz MB, Guray Y, Altay H, Demirkan B, Caldir V, Guray U, Biyikoglu SF, Sasmaz H, Kisacik HL, Korkmaz S. Fate of internal mammary artery grafted to left anterior descending artery is influenced by native vessel stenosis and viable myocardium. Angiology 2008; 60:201-6. [PMID: 18413331 DOI: 10.1177/0003319708316010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In this study, factors leading to the failure of internal mammary artery grafting was investigated among patients with coronary bypass. In all, 1323 patients were evaluated. It was found that lower grade diameter stenosis in the native vessel during postoperative angiogram and wall motion score index independently affected the fate of internal mammary artery as a graft. Grafting with internal mammary artery to native vessels with lower grade stenosis and to myocardium with poor wall score might not be a rational approach.
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Affiliation(s)
- Mehmet B Yilmaz
- Department of Cardiology, Cumhuriyet University, School of Medicine, Sivas, Turkey.
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Hartman JM, Kelder HC, Ackerstaff RGA, Swieten van HA, Vermeulen FEE, Bogers AJJC. Can Late Supraclavicular Echo Doppler Reliably Predict Angiographical String Sign of Lima to Lad Area Grafts? Echocardiography 2007; 24:689-96. [PMID: 17651097 DOI: 10.1111/j.1540-8175.2007.00461.x] [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: 11/30/2022] Open
Abstract
OBJECTIVE To investigate whether supraclavicular ultrasonography of left internal mammary artery (LIMA) to left anterior descending (LAD) area grafts can reliably predict (distal) string sign grafts on arteriography. METHODS Fifty-five patients (42 M, 61 +/- 7 years) with the LIMA to LAD area grafting were prospectively studied. Control arteriography was performed at 1.4 +/- 0.8 years postoperatively. Angiography demonstrated in 46 patients (group I) functional grafts, in 4 patients (group II) sequential distal string sign grafts and in 5 patients (group III) total string sign grafts. Ultrasonography was performed at 1.8 +/- 0.8 year postoperatively and compared with control angiography. Data were tested by unpaired t- and ANOVA tests. The diagnostic accuracy was assessed by the area under the curve of the Receiver Operator Characteristic. A formula was developed to predict the probability of (distal) string sign phenomena of sequential as well as single LIMA grafts. RESULTS Between the groups all duplex parameters showed a highly significant linear relation (p < or = 0.004) and all parameters between group I and III are significantly different with high Area Under Curve values. The model for the probability of (distal) string sign grafts fitted best with diastolic and systolic peak velocities as the most discriminative factors for (distal) string sign grafts. CONCLUSIONS Postoperative supraclavicular duplex as a method to assess the patency of LIMA to LAD area grafts allows discriminating functional grafts from (distal) string sign grafts.
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Affiliation(s)
- Joost M Hartman
- Department of Cardiothoracic Surgery, Thoraxcentre, Erasmus Medical Centre Rotterdam, CA Rotterdam.
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Shimizu T, Suesada H, Cho M, Ito S, Ikeda K, Ishimaru S. Flow capacity of gastroepiploic artery versus vein grafts for intermediate coronary artery stenosis. Ann Thorac Surg 2006; 80:124-30. [PMID: 15975353 DOI: 10.1016/j.athoracsur.2005.02.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2004] [Revised: 01/21/2005] [Accepted: 02/01/2005] [Indexed: 11/28/2022]
Abstract
BACKGROUND Native flow competition is a significant factor affecting bypass graft patency. The objective of this study was to compare the effect of competitive flow on conduit flow dynamics in the gastroepiploic artery (GEA) and the saphenous vein graft (SVG). METHODS In 51 patents, 23 GEAs (in-situ grafts) and 28 SVGs (aortocoronary grafts) were examined using a Doppler-tipped guidewire during coronary angiography after coronary artery bypass. Graft flow volume at rest and maximum graft flow volume during hyperemia were calculated from graft diameter and average peak velocity at rest and maximum average peak velocity induced by papaverine hydrochloride injection. Grafts were classified according to the grade of native coronary artery stenosis; group S (14 GEAs and 16 SVGs) displayed over 75% stenosis and group M (9 GEAs and 12 SVGs) exhibited over 50% up to 75% stenosis. RESULTS In group S, no difference in flow volume was apparent between the GEA and the SVG at rest (36+/- 17 vs 42 +/- 16) and during hyperemia (78 +/- 30 vs 88 +/- 28). In group M, flow volume of the GEA was significantly lower than that of the SVG at rest (17 +/- 11 vs 38 +/- 12; p = 0.029) and during hyperemia (32 +/- 19 vs 94 +/- 46; p = 0.001). CONCLUSIONS These data suggest that in intermediate coronary stenosis, GEA flow is compromised by native flow competition, whereas the SVG flow dynamics is maintained. However, the GEA can provide comparable flow capacity to the SVG and will achieve good surgical results when target coronary artery selection is appropriate.
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Affiliation(s)
- Tsuyoshi Shimizu
- Department of Surgery II, Tokyo Medical University, Tokyo, Japan.
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25
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Abstract
Since its inception in the 1960s, coronary artery bypass graft (CABG) evolved as one of the most common, best documented, and most effective of all major surgical treatments for ischemic heart disease. Despite its widespread use, however, the outcome is not always completely satisfactory. The objective of this review is to highlight the physical determinants of biomechanical design of CABG so that future procedures would have prolonged patency and better outcome. Our central axiom postulates the existence of a mechanical homeostatic state of the blood vessel, i.e., the variation in vessel wall stresses and strains are relatively small under physiological conditions. Any perturbation of mechanical homeostasis leads to growth and remodeling. In this sense, stenosis and failure of a graft may be viewed as an adaptation process gone awry. We outline the principles of engineering design and discuss the biofluid and biosolid mechanics principles that may have the greatest bearing on mechanical homeostasis and the long-term outcome of CABG.
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Affiliation(s)
- Ghassan S Kassab
- Department of Biomedical Engineering, University of California, Irvine, California 92697-2715, USA.
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Iida Y, Obitsu Y, Shigematsu H. Flow dynamic comparison of in-situ internal thoracic and gastroepiploic arterial conduits: experimental study. THE JAPANESE JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY : OFFICIAL PUBLICATION OF THE JAPANESE ASSOCIATION FOR THORACIC SURGERY = NIHON KYOBU GEKA GAKKAI ZASSHI 2006; 54:233-8. [PMID: 16813103 DOI: 10.1007/pl00022242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
OBJECTIVE We tried to experimentally clarify the flow dynamic differences under flow competitive conditions between the internal thoracic artery (ITA) and gastroepiploic artery (GEA) as in-situ arterial bypass conduits. METHODS The ITA and the GEA were anastomosed close together to the left anterior descending artery (LAD) in 8 pigs. Flow characteristics of the ITA and the GEA were analyzed using a transit time flowmeter under the following flow competitive conditions; condition A: the ITA, GEA and LAD were left open, condition B: either of the ITA or GEA were clamped and the LAD was left open, condition C: the ITA and GEA were open but the proximal LAD was clamped, condition D: either of the ITA or GEA were clamped and the proximal LAD was also clamped. RESULTS The flow volume of the ITA was significantly (p<0.001) greater than that of the GEA in condition A (27 +/- 11 ml/min vs. -4 +/- 9 ml/min), B (26 +/- 17 ml/min vs. -1 +/- 14 ml/min) and C (38 +/- 14 ml/min vs. 0 +/- 4 ml/min), but did not differ (p=0.685) in condition D (29 +/- 6 ml/min vs. 31 +/- 14 ml/min). Retrograde flow in systole and antegrade flow in diastole was seen in the GEA in condition A, B and C. CONCLUSION Under flow competitive conditions, flow of the GEA was inferior to that of the ITA. These data suggested that the GEA is more sensitive to competitive flow than the ITA. This may be due to anatomical differences between these in-situ bypass conduits.
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Affiliation(s)
- Yasunori Iida
- Second Department of Surgery, Tokyo Medical University, Japan
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Kim KB, Kang CH, Lim C. Prediction of Graft Flow Impairment by Intraoperative Transit Time Flow Measurement in Off-Pump Coronary Artery Bypass Using Arterial Grafts. Ann Thorac Surg 2005; 80:594-8. [PMID: 16039211 DOI: 10.1016/j.athoracsur.2005.02.047] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2005] [Revised: 02/09/2005] [Accepted: 02/15/2005] [Indexed: 10/25/2022]
Abstract
BACKGROUND We assessed the validity of intraoperative transit time flow measurement (TTFM) in predicting graft flow abnormalities. METHODS Intraoperative graft flow measurement using TTFM and early postoperative coronary angiography was performed in 58 patients who underwent total arterial off-pump coronary artery bypass. Five variables (flow pattern, mean flow, pulsatility index, insufficiency ratio, and fast Fourier transformation ratio) were measured and compared between 103 normal and 14 abnormal (occluded or competitive) grafts. RESULTS The grafts anastomosed to the right coronary territories showed significantly less diastolic dominant pattern, lower mean flow and fast Fourier transformation ratio, and higher pulsatility index than grafts to the left coronary artery territories (p < 0.05). None of the abnormal grafts showed a diastolic dominant flow pattern. The abnormal grafts demonstrated significantly lower mean flow and fast Fourier transformation ratio and higher pulsatility index and insufficiency ratio than normal grafts (p < 0.05). When our criteria for detection of abnormal graft flow, [(1) systolic dominant or balanced pattern of the flow curve in the left coronary territories, systolic dominant pattern of the flow curve in the right coronary territories; (2) mean flow < 15 mL/min; (3) pulsatility index > 3 in the left coronary territories and > 5 in the right coronary territories; and (4) insufficiency ratio > 2%] were applied, the sensitivity and specificity of TTFM to detect the graft flow abnormality were 96.2% and 76.9%, respectively. CONCLUSIONS Our data suggest that TTFM is a reliable intraoperative tool to predict graft flow impairment.
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Affiliation(s)
- Ki-Bong Kim
- Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul, Korea.
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Berger A, MacCarthy PA, Siebert U, Carlier S, Wijns W, Heyndrickx G, Bartunek J, Vanermen H, De Bruyne B. Long-term patency of internal mammary artery bypass grafts: relationship with preoperative severity of the native coronary artery stenosis. Circulation 2005; 110:II36-40. [PMID: 15364835 DOI: 10.1161/01.cir.0000141256.05740.69] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
BACKGROUND Internal mammary artery conduits (IMA) have an excellent long-term patency rate. Nevertheless, graft closure does occur and significantly limits future revascularization options. We sought to investigate the relationship between the long-term patency of IMA with clinical and angiographic parameters. Particularly, the preoperative degree of stenosis of the relevant bypassed coronary vessel was assessed to analyze the importance of chronic competitive flow on the arterial graft closure rate. METHODS AND RESULTS Consecutive patients in whom occlusion of at least 1 IMA had been documented at angiography (OCC group) were compared with a group of patients with patent IMA grafts (PAT group). The degree of stenosis in the native coronary artery on which the IMA was placed was analyzed by off-line quantitative coronary angiography. Multivariate stepwise logistic regression was used to identify independent clinical and angiographic predictors of occlusion. The OCC group comprised 96 patients (67+/-10 years) with 103 native bypassed arteries analyzed. The PAT group comprised 127 patients (69+/-8 years) with 170 native bypassed arteries analyzed. Both groups were similar except for gender (42% versus 32% female; P=0.04), height (166+/-8 versus 169+/-8 cm; P=0.006), minimum lumen diameter (0.76+/-0.7 versus 0.51+/-0.5; P=0.001), and diameter stenosis of the native artery (73+/-25% versus 84+/-16%; P<0.0001) in OCC versus PAT, respectively. In the multivariate analysis, only percent diameter stenosis was an independent and statistically significant predictor for graft patency. Among IMA placed on coronary arteries with a diameter of stenosis <50% (n=28), the occlusion rate was very high (79%). CONCLUSIONS The degree of stenosis in the native vessel is a major predictor of internal mammary artery bypass graft patency. The association between nonsignificant stenosis of the native artery and high occlusion rate of the arterial bypass conduit raises concerns about the use of IMA in the treatment of native vessels with only mild or moderate stenosis.
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Vural KM, Iscan ZH, Kunt A, Sener E, Tasdemir O. Off-Pump, In Situ Internal Thoracic Artery Grafting: A Durable Treatment for Single-Vessel Coronary Artery Disease. Ann Thorac Surg 2005; 79:814-8. [PMID: 15734384 DOI: 10.1016/j.athoracsur.2004.08.044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 08/23/2004] [Indexed: 10/25/2022]
Abstract
BACKGROUND The value of off-pump in situ left internal thoracic artery to left anterior descending coronary artery bypass grafting in single-vessel coronary artery disease was assessed by long-term angiographic and clinical data. METHODS One-hundred three randomly selected patients (87 male, 16 female; mean age, 57.4 +/- 10.5 years) underwent postoperative angiographic control after an average postoperative period of 4.8 +/- 2.9 years (up to 8.2 years; a total of 490 patient-years). RESULTS Fifty-five patients (52%) were asymptomatic, whereas 31 (30%) had anginalike chest pain. Ninety-seven patients (94.2%) were in New York Heart Association class I or II. Five-year angina-free survival was 81% +/- 5%. Of 103 left internal thoracic arteries assessed, 99 were patent (overall patency, 96.1%). All four cases having occluded grafts had mild native vessel stenoses (<80%) before operation. The patency rate was 99% +/- 1% at 3 years, and 93% +/- 4% at 5 years. The left ventricular segmental wall motion score of the left anterior descending coronary arterial distribution improved from 4.1 +/- 1.1 to 3.7 +/- 0.9 (p = 0.001). Consequently, 15 patients (15%) underwent secondary revascularization (11 interventional and 4 surgical) 4.8 +/- 2.1 years after the primary operation. The most frequent indication for interventional revascularization was atherosclerotic progression in systems other than left anterior descending artery. The cases with graft occlusion were treated surgically. Five-year freedom from interventional or surgical repeat revascularization was 91% +/- 4%. CONCLUSIONS In addition to the well-documented safety and reliability, off-pump in situ left internal thoracic artery grafting is also a durable treatment for isolated left anterior descending artery disease, in both clinical and angiographic terms.
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Affiliation(s)
- Kerem M Vural
- Department of Cardiovascular Surgery, Yuksek Ihtisas Hospital of Turkey, Ankara, Turkey.
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Sabik JF, Lytle BW, Blackstone EH, Houghtaling PL, Cosgrove DM. Comparison of Saphenous Vein and Internal Thoracic Artery Graft Patency by Coronary System. Ann Thorac Surg 2005; 79:544-51; discussion 544-51. [PMID: 15680832 DOI: 10.1016/j.athoracsur.2004.07.047] [Citation(s) in RCA: 264] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/19/2004] [Indexed: 10/25/2022]
Abstract
BACKGROUND We sought to compare saphenous vein and internal thoracic artery graft patency by coronary system. METHODS From 1972 to 1999, 50,278 patients underwent primary coronary surgery; subsequently, 4,333 had angiography of 2,121 internal thoracic artery and 8,733 saphenous vein grafts. Longitudinal analysis was used to model graft occlusion and identify risk factors. Using the model, patency was calculated twice for each graft and compared first as if an internal thoracic artery, and second as if a saphenous vein, were used. RESULTS Unadjusted 1-, 5-, and 10-year patency was 93%, 88%, and 90% for internal thoracic arteries and 78%, 65%, and 57% for saphenous veins. At 10 years, internal thoracic arteries were more likely than saphenous veins to be patent to left anterior descending in 99.1% of cases, to diagonals in 98.3%, to circumflex in 98.3%, to posterior descending artery in 98.5%, and to right coronary arteries in 82.5%. For right coronary arteries, saphenous vein patency was equivalent to or better than internal thoracic artery patency early after surgery. However, by 10 years, internal thoracic artery patency was better in right coronary arteries with 70% stenosis or greater. At all times after surgery and all levels of clinically important coronary stenosis, internal thoracic artery patency surpassed saphenous vein patency in grafts to the left anterior descending, diagonal, circumflex, and posterior descending arteries. CONCLUSIONS Internal thoracic arteries demonstrate better patency than saphenous veins except when grafting moderately stenosed right coronary arteries. When bypassing right coronary arteries with less than 70% stenosis, saphenous veins may be a better choice.
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Affiliation(s)
- Joseph F Sabik
- Department of Thoracic and Cardiovascular Surgery, The Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA.
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Rodrigues AJ, Vicente WVA, Bassetto S, Filho AS. Anomalous origin of the left coronary artery from the pulmonary artery in an adult with systemic collateral circulation to the left coronary artery. Ann Thorac Surg 2004; 78:1082-4. [PMID: 15337058 DOI: 10.1016/s0003-4975(03)01421-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/23/2003] [Indexed: 10/26/2022]
Abstract
A case of anomalous origin of the left coronary artery from the pulmonary artery in an adult with collateral circulation between the left coronary artery and systemic extracardiac vessels is reported. After evaluating the surgical options, my colleagues and I conclude that ligation of the left coronary artery and a left internal thoracic artery graft to the left anterior descending coronary artery is the preferable option for treating such patients.
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Affiliation(s)
- Alfredo J Rodrigues
- Division of Cardiothoracic Surgery, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
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Sabik JF, Lytle BW, Blackstone EH, Khan M, Houghtaling PL, Cosgrove DM. Does competitive flow reduce internal thoracic artery graft patency? Ann Thorac Surg 2003; 76:1490-6; discussion 1497. [PMID: 14602274 DOI: 10.1016/s0003-4975(03)01022-1] [Citation(s) in RCA: 157] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND In coronary arteries with moderate stenosis, competitive flow may lead to internal thoracic artery (ITA) graft occlusion. The goals of this study were to determine if competitive flow reduces ITA patency, and if there is a degree of coronary stenosis below which ITAs should not be used. METHODS From 1972 to 1999, 50,278 patients underwent primary coronary artery bypass grafting (CABG). Of these, 2,002 had at least one ITA graft and postoperative angiography before coronary reintervention; 2,999 angiograms of 2,121 ITAs were made. Time-related ITA occlusion was modeled using longitudinal analysis to identify its risk factors while accounting for lack of independence introduced by repeated angiography and multiple ITA anastomoses per patient. Proximal coronary stenosis (maximum preoperative stenosis between ITA anastomosis and aorta) was the surrogate for competitive flow. RESULTS Unadjusted ITA patency was 93%, 89%, 90%, and 92% at 1, 5, 10, and 15 years after CABG. Risk factors associated with ITA occlusion were lesser degree of proximal coronary stenosis (p < 0.0001); longer time from CABG in grafts to non-left anterior descending coronary arteries (p < 0.0001); female sex (p = 0.0003); later date of CABG (p = 0.01); right ITA (p < 0.0001); and smoking (p < 0.0001). In all arteries, as preoperative proximal coronary stenosis decreased, ITA patency declined; however, at no degree of stenosis was there a sharp decline. CONCLUSIONS Internal thoracic artery patency decreases as coronary competitive flow increases. However, the nature of this relationship indicates ITAs should not be abandoned at moderate grades of stenosis.
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Affiliation(s)
- Joseph F Sabik
- Department of Thoracic and Cardiovascular Surgery, The Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA.
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Nakamura Y, Kobayashi J, Tagusari O, Bando K, Niwaya K, Nakajima H, Ishida M, Kitamura S. Early results of complete off-pump coronary revascularization using left internal thoracic artery with composite radial artery. Gen Thorac Cardiovasc Surg 2003; 51:10-5. [PMID: 12645148 DOI: 10.1007/s11748-003-0058-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
OBJECTIVE Off-pump coronary artery bypass (OPCAB) using the left internal thoracic artery (LITA) with a composite radial artery (RA) was employed for arterial revascularization in order to minimize neurological complication. METHODS Sixty-one patients underwent OPCAB using the LITA with a composite RA. Angiography was performed in all patients at two weeks postoperatively. RESULTS The mean number of distal anastomoses was 3.2 +/- 0.4. A Y-composite graft was used in 55 patients, and K-composite graft was used in the other 6 patients. There was no hospital death, no neurological complication nor deep sternal infection. Furthermore, there was no episode of perioperative myocardial infarction nor hypoperfusion syndrome. Patients have been angina-free during a mean follow-up period of 1 year. The graft patency of the LITA to the left anterior descending artery (LAD) was 100% (61/61 anastomoses). The RA became occluded in 4 patients, and the patency rate was 95.6% (130/136 anastomoses). String or coronary-coronary bypass resulting from flow competition was observed in the LITA of 6 patients and in the RA of 13 patients. The string of the LITA occurred in the segment distal from the anastomosis with the composite RA. The string or coronary-coronary bypass was observed more often in cases in which the recipient coronary artery had less than 75% stenosis. CONCLUSION OPCAB using only the LITA with a composite RA can be successfully and safely performed in patients with multivessel disease. Late postoperative follow-up of the flow competition is necessary to delineate the significance of flow competition.
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Affiliation(s)
- Yoshitsugu Nakamura
- Department of Cardiovascular Surgery, National Cardiovascular Center, 5-7-1 Fujishirodai, Suita, Osaka 565-8565, Japan
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Barner HB. Coronary revascularization in the 21st century. Emphasis on contributions by Japanese surgeons. THE JAPANESE JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY : OFFICIAL PUBLICATION OF THE JAPANESE ASSOCIATION FOR THORACIC SURGERY = NIHON KYOBU GEKA GAKKAI ZASSHI 2002; 50:541-53. [PMID: 12561100 DOI: 10.1007/bf02913172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The first three decades of coronary artery surgery have provided the foundation for the next century of this evolution. It is apparent that a multitude of events including the development of cardioplegia, improving surgical instrumentation, technological advances including endoscopic approaches and computer assisted robotics and biologic discoveries such as the role of the endothelium have provided the underpinnings for improved surgical outcomes. However, the single most important determinant of late results is the type of bypass conduit used for grafting. Thus, use of the left internal thoracic artery (ITA) grafted to the left anterior descending coronary is a more important determinant of survival than is any other factor (progression of coronary artery disease, increased age, poor left ventricular function, diabetes, female gender and off-pump operations). Use of two ITAs provides further benefit and it is likely that three or more arterial conduits will be shown to be advantageous in this regard in due time. Japanese cardiothoracic surgeons have made significant contributions to the continuing evolution of coronary bypass surgery and particularly to the advance of arterial conduits. This report will address those contributions to this evolution.
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Abid Q, Parry G, Forty J, Dark JH. Concurrent coronary grafting of the donor heart with left internal mammary artery: 10-year experience. J Heart Lung Transplant 2002; 21:812-4. [PMID: 12100908 DOI: 10.1016/s1053-2498(01)00391-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We report 4 donor hearts with palpable atherosclerosis on the surface of the left anterior descending coronary artery (LAD), which was thought to be significant. The heart ordinarily would have been rejected in the absence of availability of donor coronary angiography or bench angiography. Instead, we accepted the organ and bypassed the atherosclerotic lesion with a left internal mammary artery. Long-term outcome and follow-up are reported.
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Affiliation(s)
- Qamar Abid
- Department of Cardiopulmonary Transplantation, Freeman Hospital, Newcastle upon Tyne, UK.
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Smith EJ, Hasan R, Curzen NP. The Achilles heel of composite arterial grafting: early occlusion of the distal right coronary limb. J Thorac Cardiovasc Surg 2002; 124:186-8. [PMID: 12091829 DOI: 10.1067/mtc.2002.122682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Elliot J Smith
- Department of Cardiology, Manchester Heart Centre, Manchester Royal Infirmary, Manchester, United Kingdom
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Gaudino M, Alessandrini F, Nasso G, Bruno P, Manzoli A, Possati G. Severity of coronary artery stenosis at preoperative angiography and midterm mammary graft status. Ann Thorac Surg 2002; 74:119-21. [PMID: 12118741 DOI: 10.1016/s0003-4975(02)03614-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND The purpose of this study was to evaluate the correlation between the midterm angiographic results of mammary artery grafts and the preoperative stenosis of the target vessel. METHODS We analyzed preoperative and postoperative angiograms of 93 patients who underwent postoperative midterm (> or = 3 years) angiograms of an internal mammary artery (IMA) to left anterior descending artery graft for clinical or study purposes. Patients were divided into three groups on the basis of the percentage of the coronary artery stenosis at preoperative angiography: < 70%, 70% to 90%, and > 90% stenosis. RESULTS Preoperative characteristics were similar in the three groups. The overall incidence of IMA occlusion was 19% in the entire population, without significant differences between groups (19% versus 29% versus 14%). The mean mammary artery diameter significantly increased in direct proportion to the severity of the coronary stenosis (2.0 +/- 0.2 mm in the < 70% versus 2.5 +/- 0.3 mm in the 70% to 90% and 2.7 +/- 0.4 mm in the > 90% series; p < 0.05). CONCLUSIONS Chronic native competitive flow does not significantly affect midterm graft status but does influence mammary graft diameter.
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Affiliation(s)
- Mario Gaudino
- Department of Cardiac Surgery, Catholic University, Rome, Italy.
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Abstract
In the initial decade of coronary surgery, serial angiography of internal thoracic artery grafts revealed increased caliber in some, decreased caliber in others, and "string sign" in a few, which was occasionally documented to be reversible. Although we speculated on possible causes of these changes, it was not until discovery of the endothelial role in modulating arterial diameter to maintain shear stress in a narrow range that we began to gain insight into the mechanisms responsible for remodeling of the arterial wall. This review provides a glimpse of the physiology and biology of arterial remodeling and summarizes observations on the various arterial conduits when subjected to flow alterations.
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Affiliation(s)
- Hendrick B Barner
- Department of Surgery, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
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Lee HS, Kwak YT, Youn YN, Park HD, Chang BC. Flow Competition of Right Gastroepiploic Artery Graft. Asian Cardiovasc Thorac Ann 2001. [DOI: 10.1177/021849230100900404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Right gastroepiploic artery is used as an in-situ arterial conduit in coronary revascularization, but flow competition has been reported. Between September 1998 and June 2000, 25 patients underwent coronary revascularization using right gastroepiploic artery. Coronary flow patterns were examined in 21 patients by postoperative angiography. Flow patterns were divided into 2 categories: right gastroepiploic artery-dependent (n = 16) and native coronary artery-dependent (n = 5). Flow competition was seen in 5 of the 21 patients (24%). The diameter of the right gastroepiploic artery was significantly larger in the right gastroepiploic artery-dependent group, whereas the diameter of the native coronary artery was larger in the native coronary artery-dependent group. Ten of 11 patients with 100% proximal coronary stenosis and all 3 who received a graft to the obtuse marginal branch showed a right gastroepiploic artery-dependent flow pattern. The flow pattern in the graft was determined by the size difference between the arterial conduit and the native coronary artery, the degree of proximal stenosis, and the site of the anastomosis. Further study is needed to evaluate the long-term results of coronary artery bypass grafting using right gastroepiploic artery.
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Affiliation(s)
- Hyun Sung Lee
- Division of Cardiovascular Surgery Yonsei Cardiovascular Center and Research Institute Yonsei University College of Medicine Seoul, Korea
| | - Young Tae Kwak
- Division of Cardiovascular Surgery Yonsei Cardiovascular Center and Research Institute Yonsei University College of Medicine Seoul, Korea
| | - Young Nam Youn
- Division of Cardiovascular Surgery Yonsei Cardiovascular Center and Research Institute Yonsei University College of Medicine Seoul, Korea
| | - Hyung Dong Park
- Division of Cardiovascular Surgery Yonsei Cardiovascular Center and Research Institute Yonsei University College of Medicine Seoul, Korea
| | - Byung Chul Chang
- Division of Cardiovascular Surgery Yonsei Cardiovascular Center and Research Institute Yonsei University College of Medicine Seoul, Korea
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