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Impact of number of vessels disease on outcome of patients with stable coronary artery disease: 5-year follow-up of the Medical, Angioplasty, and bypass Surgery Study (MASS)

From the Heart Institute (InCor), University of São Paulo Medical School, São Paulo, Brazil

Received 12 February 2007; received in revised form 14 September 2007; accepted 1 November 2007.

^_* Corresponding author. Address: Av. Dr Eneas de Carvalho Aguiar # 44, Cerqueira Cesar, Sao Paulo, SP 05403-000 Brazil. Tel.: +55 11 3069 5032; fax: +55 11 3069 5188. (Email: mass{at}incor.usp.br).

Objective: To evaluate whether the number of vessels disease has an impact on clinical outcomes as well as on therapeutic results accordingly to medical, percutaneous, or surgery treatment in chronic coronary artery disease. Methods: We evaluated 825 individuals enrolled in MASS study, a randomized study to compare treatment options for single or multivessel coronary artery disease with preserved left ventricular function, prospectively followed during 5 years. The incidence of overall mortality and the composite end-point of death, myocardial infarction, and refractory angina were compared in three groups: single vessel disease (SVD n = 214), two-vessel disease (2VD n = 253) and three-vessel disease (3VD n = 358). The relationship between baseline variables and the composite end-point was assessed using a Cox proportional hazards survival model. Results: Most baseline characteristics were similar among groups, except age (younger in SVD and older in 3VD, p < 0.001), lower incidence of hypertension in SVD (p < 0.0001), and lower levels of total and LDL-cholesterol in 3VD (p = 0.004 and p = 0.005, respectively). There were no statistical differences in composite end-point in 5 years among groups independent of the kind of treatment; however, there was a higher mortality rate in 3VD (p < 0.001). When we stratified our analysis for each treatment option, bypass surgery was associated with a lower number of composite end-point in all groups (SVD p < 0.001, 2VD p = 0.002, 3VD p < 0.001). In multivariate analysis, we found higher mortality risk in 3VD comparing to SVD (p = 0.005, HR 3.14, 95%CI 1.4–7.0). Conclusion: Three-vessel disease was associated with worse prognosis compared to single- or two-vessel disease in patients with stable coronary disease and preserved ventricular function at 5-year follow-up. In addition, event-free survival rates were higher after bypass surgery, independent of the number of vessels diseased in these subsets of patients.

Key Words: Coronary disease • Surgery • Angioplasty • Prognosis • Number of vessels disease

This article has been cited by other articles:

				G. Athappan and T. Subramanian Medical, angioplasty or surgery for stable coronary artery disease; do we have an answer !!! Eur. J. Cardiothorac. Surg., September 1, 2008; 34(3): 702 - 703. [Full Text] [PDF]

				N. Lopes, F. S. Paulitsch, and W. Hueb Reply to Athappan and Subramanian Eur. J. Cardiothorac. Surg., September 1, 2008; 34(3): 703 - 703. [Full Text] [PDF]