CXCR4 and myocardial infarction: The absolute numbers of CD34+CXCR4+ cells in acute MI was significantly lower in patients with decreased left ventricle ejection fraction (LVEF ≤40%) in the acute phase of MI [2,0 (0,4–7,8) versus 4,7 (0,7–8,9); P = 0,028], as well as in 1-year followup [2,3 (0,3–5,8) versus 5,5 (2,8–8,9); P < 0.0001] (Figures 4 and 5).