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Eur J Cardiothorac Surg 2006;30:311-317
© 2006 Elsevier Science NL
a Department of Thoracic Surgery, Karolinska University Hospital, Stockholm, Sweden
b Department of Epidemiology; Institute of Environmental Medicine, Sweden
c Department of Epidemiology, AstraZeneca R&D, Mölndal, Sweden
d Department of Epidemiology, Stockholm Centre of Public Health, Stockholm, Sweden
Received 21 March 2006; accepted 15 May 2006.
* Corresponding author. Address: Department of Cardiothoracic Surgery, Karolinska University Hospital, S-171 76 Stockholm, Sweden. Tel.: +46 8 517 70832; fax: +46 8 331931. (Email: anders.l.jonsson{at}karolinska.se).
Objective: To analyse early and late mortality after coronary artery bypass grafting (CABG) in patients with and without left main coronary artery (LMCA) stenosis during the 30-year period 19701999. Methods: A total of 1888 of 10,647 patients (18%) who underwent a first isolated CABG at the Karolinska Hospital in Stockholm, Sweden, during 19701999 had significant left main coronary artery stenosis. The Swedish National Cause of Death Register was used to determine mortality up to five years after the operation. Results: The proportion of patients with LMCA stenosis of all CABG patients increased from 7% during the 1970s to 26% in 1999. During 19701984 early mortality was 5.8% in patients with LMCA stenosis compared with 1.5% in patients without LMCA stenosis (odds ratio (OR) 3.7 (95% confidence interval (CI) 1.87.6)). The corresponding rates during 19951999 were 2.0% versus 2.2% (OR 0.8 (95% CI 0.51.5)), respectively. The increased risk of early death in patients with LMCA stenosis was neutralised in males during 19851994 and in females during 19951999. Five-year survival in males was 88% after operations performed during 19941999 compared with 82% after CABG performed during 19701984. Five-year mortality, exclusive of early deaths, during 19701984 was higher in patients with LMCA stenosis (12.8%) than in those without (8.4%) (relative risk 1.7 (95% CI 1.12.5)). An increased risk of late mortality in patients with LMCA stenosis was neutralised in males during 19851994 and in females during 19951999. Conclusions: During 19701999 there was a decrease of early and five-year mortality in patients with LMCA stenosis after CABG despite increase of patient age and risk factors. There were gender differences so that the risk of death in patients with compared with in those without LMCA stenosis was neutralised in males during 19851994 and in females during 19941999. The continuous decline of mortality during three decades most likely reflects improvement of the peri- and postoperative management of patients undergoing CABG during this period.
Key Words: Left main coronary artery Mortality Coronary artery bypass grafting
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