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Figure 4 Survival free of congestive heart failure or cardiac death (event-free survival) in asymptomatic patients after myocardial infarction according to the degree of mitral regurgitation measured by effective regurgitant orifice (ERO) 20 mm² (continuous line), 1 to 19 mm² (dashed line), and absent mitral regurgitation (ERO = 0) (dotted line) at diagnosis. The event-free survival rates at five years are indicated ± the standard error.