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Progressive improvement of myocardial perfusion after off-pump revascularization with bilateral internal thoracic arteries: Comparison of early versus 1-year postoperative myocardial single photon emission computed tomography

Authors
 Kwang Ree Cho  ;  Ho Young Hwang  ;  Ki-Bong Kim  ;  Dong Soo Lee  ;  Won Jun Kang 
Citation
 JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY, Vol.133(1) : 52-57, 2007 
Journal Title
 JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY 
ISSN
 0022-5223 
Issue Date
2007
MeSH
Coronary Artery Bypass, Off-Pump* ; Coronary Circulation* ; Female ; Heart/diagnostic imaging ; Humans ; Internal Mammary-Coronary Artery Anastomosis* ; Male ; Middle Aged ; Radiopharmaceuticals ; Technetium Tc 99m Sestamibi ; Tomography, Emission-Computed, Single-Photon*
Abstract
OBJECTIVE: We evaluated the time course of myocardial perfusion improvement after off-pump revascularization. METHODS: Seventy-six patients who underwent off-pump coronary bypass with bilateral internal thoracic arteries for revascularization of the left coronary territory were studied. Myocardial single photon emission computed tomography was performed preoperatively and at 3 months and 1 year postoperatively. Myocardial perfusion was quantified with automatic software, and the left coronary territory was divided into 16 segments. As an indicator of the ischemic myocardium, the reversibility score was defined as a measure of rest minus stress perfusion values. A total of 403 segments that showed a reversibility score of 7 or greater preoperatively were included. RESULTS: The reversibility score was improved significantly at 3 months postoperatively (P < .001) and further improved 1 year after the operation (P < .001). When the patients were divided into 2 groups based on the type of bilateral internal thoracic arteries used (group Y: Y-composite graft, n = 39; group I: bilateral in situ grafts, n = 37), the reversibility score was improved significantly 3 months after the operation (P < .001) and further improved 1 year after the operation (P < .001) in both groups. There were no significant differences in the reversibility scores between groups Y and I at postoperative month 3 (P = .463). The scores approached zero in both groups at 1 year postoperatively (group Y, -1.7% +/- 7.9%; group I, 1.3% +/- 7.2%). CONCLUSIONS: The myocardial reversibility score improved greatly during the first 3 months after the operation and further improved until 1 year postoperatively. Perfusion improvement was similar between the Y-composite and bilateral in situ internal thoracic artery grafts in terms of the reversibility score.
Full Text
http://www.sciencedirect.com/science/article/pii/S0022522306017260
DOI
10.1016/j.jtcvs.2006.09.014
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Nuclear Medicine (핵의학교실) > 1. Journal Papers
Yonsei Authors
Kang, Won Jun(강원준) ORCID logo https://orcid.org/0000-0002-2107-8160
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/96694
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