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Effect of Internal Thoracic Artery Side Branches On Distal Flow

Internal Torasi k Arterin Yan Dallarnn Distal Akıma Etkisi

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Abstract (2. Language): 
Objective: Internal thoracic artery (İTA) is routinely used as an arterial greft for coronary artery bypass grafting (CABG). Steal phenomenon is described as a culprit causing myocardial low perfusion due to İTA side branch patency. Steal phenomenon due to limited dissection of İTA side branches in minimally invasive CABG method resulting in patency of İTA side branches has gained popularity. There is no definite evidence in the literature regarding the side branches of the İTA as the only cause of myocardial ischemia in CABG. Material and Methods: İn order to document the effects of İTA side branches on the flow pattern, 22 patients applying for CABG were randomly involved in the study. İTA was dissected with pedicle until the subclavian artery proximally and the bifurcation distally, protecting first intercostal and thymic side branches. İTA flow measurements were done from the distal part and after resecting the 1/3 distal part, clamping and unclamping the side branches for each part. Results: There was no significant difference in flow measurements for clamped and unclamped side branches in neither the distal (20.7±10.1 mL/min vs. 20.3±11.1 mL/min) nor the proximal (55.6±26.0 mL/min vs. 55.1±29.0 mL/min) parts of İTA (p>0.05). On the other hand, flow measurements were higher at the proximal part than the distal part regardless of the side branches being clamped or not (p<0.01). Conclusion: İn this report we found that İTA side branches have no significant effect on distal flow. Therefore, patent side branches of İTA do not cause myocardial ischemia unless accompanying lesions such as stenosis of anastomosis, inadequate caliber of İTA and inadequate distal run off of the coronary vessels are present. Flow measurments were higher when İTA was resected more proximally, suggesting that İTA must be used as proximally as possible in anastomosis.
Abstract (Original Language): 
Amaç: internal torasik arter (İTA) koroner bypass cerrahisinde rutin olarak kullanılan arteryel grefttir. Açık olan İTA yan dallarına olan akım nedeni ile çalma fenomeni tanımlanmış ve myokardiyal perfüzyon bozukluğunun nedeni olarak gösterilmiştir. Minimal invaziv koroner cerrahisinde kullanılan sınırlı İTA diseksiyonunun yan dalların açık kalmasına neden olması sonucu çalma fenomeni önem kazanmıştır. Literatürde ise açık kalan İTA yan dallarının koroner bypass sonrası myokardiyal iskeminin tek nedeni olduğunu gösteren kesin bulgu yoktur. Yöntem: İTA yan dallarının akım patternine olan etkisini ortaya koymak amacıyla, koroner bypass cerrahisi için başvuran 22 hasta randomize olarak çalışmaya alındı. İTA, birinci interkostal ve timik dalları korunarak, proksimalde subklavian artere, distalinde de bifurkasyona kadar pediküllü olarak serbestleştirildi. İTA'nın önce distal kısmından yan dallar klempli ve klempsiz, sonra 1/3 distal kısım kesilerek yan dallar klempli ve klempsiz akım ölçümleri yapıldı. Bulgular: İTA yan dallarının klempli ve klempsiz akım ölçümlerinde, distal (20.7±10.1 mL/dk - 20.3±11.1 mL/dk) veya proksimal (55.6±26.0 mL/dk - 55.1±29.0 mL/dk) akımlarında anlamlı fark bulunmamıştır (p>0.05). Ancak proksimal kısımda akım distale göre yan dallar klempli veya klempsiz ölçümlerde daha yüksek bulunmuştur (p<0.01).Sonuç: Bu çalışmada İTA yan dallarının distal akıma anlamlı etkisinin olmadığı gösterilmiştir. Açık kalan yan dallar anastamoz stenozu, yetersiz kalibrasyonda İTA ve yeterli distal yatak olmaması gibi nedenler olmadıkça myokardiyal iskemiye neden olmamaktadır. İTA akımlarının proksimale çıkıldıkça artması, İTA'in anastamoz sırasında mümkün olduğunca proksimalden kullanılması gerektiğini göstermiştir.
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REFERENCES

References: 

1. Luise R., Teodori G., Di Giammarco G, D'Annunzio E, Paloscia L, Barsotti A, Gallina S, Contini M, Vitolla G, Calafiore AM. Persistence of mammary artery branches and blood supply to the left anterior descending artery. Ann Thorac Surg 1997;63:1759-64
2. Robinson MC, Gross DR, Zeman W, Stedje-Larsen E. Minimally invasive coronary artery bypass grafting. A new method using an anterior mediastinotomy. J Card Surg
1995;10:529-36
3. Benetti FJ, Ballester C, Sani G, Doonstra P, Grandjean J. Video assisted coronary bypass
surgery. J Card Surg 1995;10:620-5
4. Acuff TE, Landreneau RJ, Griffith BP, Mack MJ. Minimally invasive coronary artery bypass grafting. Ann Thorac Surg 1996;61:135-7
5. İvert T, Huttunen K, Landou C, Bjork VO. Angiographic studies of internal mammary artery grafts after coronary bypass grafting. J Thorac Cardiovasc Surg 1988;96:1-12
6. Kuttler H, Hauenstein KH, Kameda T, Wenz W, Schlosser V. Significance of early angiographic follow-up after internal thoracic artery anastomosis in coronary surgery.
Thorac Cardiovasc Surg 1988;36:96-9
7. Kern M.J. Editorial: Mammary Side Branch Steal: İs this a real or even clinically important phenomenon? Ann Thorac Surg 1998;66:1873-5
8. Abhyankar AD, Mitchell AS, Bernstein L. Lack of evidence for improvement in internal mammary artery graft flow by occlusion of side branch. Cathet Cardiovasc Diagn
1997;42:291-3
9. Guadino M, Serricchio M., Glieca F, Bruno P, Tondi P, Giordano A, Trani C, Calcagni ML, Pola P, Possati G. Steal phenomenon from mammary side branches: when does it
occur? Ann Thorac Surg 1998;66:2056-62
10. Palac RT, Meadows WR, Hwang MH, Loeb HS, Pifarre R, Gunnar RM. Risk factors
related to progressive narrowing in aortocoronary vein grafts studied 1 and 5 years after
surgery. Circulation 1982;66(suppl İ):1-40. Circulation. 1982 Aug;66(2 Pt 2):İ40-4.
11. Singh RN, Sosa JA. İnternal mammary artery-coronary artery anastomosis: influence of the side branches on surgical result. J Thorac Cardiovasc Surg 1981;82:909-14.

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