“…22 In Iran, Karimi et al 13 , from the Thoracic Surgery Society in the United States, reported on the correlation between volume and mortality of CABG: when the number of surgeries per hospital was lower than 100 procedures/year, the mortality rate was 5.0%, whereas when the number was higher, mortality was 3.2%. 24 In Brazil, from 1996 to 1998, by reviewing AIHs, Noronha et al 25 observed a CABG mortality rate of 7.2%. When the number of surgeries per institution was higher than 600 or lower than 151 procedures within three years, the mortality rates ranged from 5.81% to 9.00%, respectively.…”