Fig. 1From: Hospital market concentration and the use of mechanical circulatory support devices in acute myocardial infarction complicated by cardiogenic shockOdds Ratio of Herfindal-Hirschman Index (variable radius 75%) by Year. Multivariable mixed effect model for patients with acute myocardial infarction complicated by cardiogenic shock showed that market concentration was a significant predictor of receiving mechanical circulatory support for patients in 2009. Market concentration was not significant for patients in 2003 or 2006Back to article page