At the 6-month follow-up , the ejection fraction was significantly increased in the BMC-treated group compared to controls ( 47.58 6.34 vs. 40.11 7.42 ; p < 0.05 ) , whereas the WMSI were significantly decreased ( 1.25 0.32 vs. 1.54 0.53 ; p < 0.05 ) , with no occurrences of life-threatening arrhythmias or death .