Total Arterial Revascularization Using Y-composite Graft for Isolated Left Main Coronary Artery Disease / 대한흉부외과학회지

BACKGROUND: For the treatment of isolated left main coronary artery disease, twelve arterial revascularizations with Y-composite grafts using left internal thoracic artery and radial artery or right gastroepiploic artery were performed. This study was performed to investigate whether Y-composite graft can satisfy the blood flow required to make myocardium act properly or not. Borderline stenotic lesions on the left main coronary artery, which are very prone to remodel the bypassed vessels due to competitive flows, were also considered. MATERIAL AND METHOD: Among 247 patients who underwent coronary artery bypass grafting from March 2000 to April 2003, 12 patients (4.7%) who had received total arterial revascularizations for the isolated left main coronary artery disease were studied retrospectively. RESULT: Left anterior descending arteries were bypassed with left internal thoracic artery by off-pump technique in all patients, however, 2 cases of left obtuse marginal branches were bypassed under on-pump beating heart. Except for one patient, who did not have an obtuse marginal branch more than 1 mm in diameter, 11 patients had gone through complete arterial revascularizaions by use of the Y shape arterial graft. Among five patients who had less than 75% stenosis, one patient showed string sign on left internal thoracic artery grafted to left anterior descending artery. However, two grafts to obtuse marginal branches were completely obstructed and one showed slender sign. There were no graft-dominant flow in patients with stenotic lesion less than 75%. On the contrary to the result of patients with stenotic lesions less than 75%, all the patients with stenotic lesions more than 90% showed graft-dominant blood flow. CONCLUSION: In conclusion, it is assumed that, when stenotic lesions are over 90%, coronary artery bypass grafting with an Y shape arterial graft could possibly give enough help to the obstructed coronary arteries in blood supplying to myocardium, which needs massive quantity of blood to act well. However, when patients have borderline stenoses, through scrupulous examinations, more prudent and flexible decisions are required in choosing the treatment methods, such as, direct anastomosis of vein or artery to aorta, or adding supplementary treatment methods like percutaneous coronary intervention, rather than choosing a fixed treatment methods.

Routine Off-pump Total Arterial Coronary Revascularization / 대한흉부외과학회지

BACKGROUND: To avoid the adverse effects of cardiopulmonary bypass and to overcome late vein graft failure, we routinely performed off-pump total arterial coronary revascularization. MATERIAL AND METHOD: From July 2000 to August 2001, 104 consecutive patients underwent first elective off-pump total arterial coronary revascularization. Both internal mammary, radial and gastroepiploic arteries were used. Sequential and composite grafts were used to achieve complete revascularization. Perioperative adverse events and postoperative angiograms were analyzed. RESULT: A total of 252 arterial conduits were used with an average of 2.47 grafts per patient. A total of 326 distal anastomosis were performed with a mean of 3.13 distal anastomosis per patient. Cross over to on-pump occurred in seven patients (6.7%). Of these 4 were due to unstable hemodynamics during lateral or posterior wall stabilization as a result of cardiomegaly and 3 were due to uncontrolled bleeding during dissection of diffusely dimunitive deeply placed intramyocardial coronary arteries. There were no opeartive deaths. Two cases of perioperative myocardial infarction and transient neurologic complications occurred, respectively. Of the 312 distal anastomoses, 308 (98.7%) were compatible with Fitz-Gibbon A or B patency grading. CONCLUSION: Off-pump total arterial coronary revascularization was technically feasible in most elective cases with satisfactory early results. However, on-pump coronary bypass surgery should be considered in difficult circumstances, such as cardiomegaly or unfavorable anatomy of the target coronary artery.

Thoracodorsal Artery as an Alternative in Complete Arterial Coronary Revascularization: 3 Cases / 대한흉부외과학회지

It is now widely accepted that the complete arterial coronary revascularization has better short and long term results compared to coronary bypass surgery using arterial graft mixed with vein graft mainly due to its superior patency rate. However, sometimes the internal thoracic artery and other conventionally used grafts might be unavailable or it may require caution in using bilateral internal thoracic artery especially in diabetic patient because of the possible risk of the mediastinitis or other associated morbidities. Moreover, there could also be a shortage for arterial graft in case of coronary reoperation. We report our first three cases using thoracodorsal artery(TDA) as an alternative graft in complete arterial coronary revascularization.

Early Results of Coronary Artery Bypass Grafting Using Multiple Arterial Grafts / 대한흉부외과학회지

BACKGROUND: Coronary artery bypass grafting(CABG) has been established as an effective treatment modality in improving the symptoms of ischemic heart disease as well as in preventing sudden death. Since the relatively wide use of arterial grafting in the 80's, an improvement in long term patency rates compared with saphenous vein grafting has been suggested. We have been using multiple arterial grafts since 1998, and we attempted to compare our early results with those of saphenous vein grafting. MATERIAL AND METHOD: Out of the 355 patients that received CABG at our center between June,1998 and May,1999, 153 patients that used cardioplegia were reviewed. 76 had received single arterial graft(Group I) and 77 had received more than 2 arterial grafts(Group II). Preoperative clinical data, ecohocardiography, and angiographic studies were analyzed retrospectively. RESULT: Preoperatively, there were statistically significant differences between Group I and Group II with respect to age and smoking history. There was one early postoperative mortality in each group. The number of anastomoses constructed per patient showed a statistical difference. There were no other differences in operative and postoperative results. CONCLUSION: Even in our learning period, there was no difference in our early results between arterial grafting and saphenous vein grafting. These early results suggest that arterial grafting may afford patients as improving in late survival. Futhermore, these results suggest that complete arterial revasularization may serve to prolong life expectancy.