The MVD and ICU stay were shorter in group B than that in groups A and C [ MVD ( days ) : 8.4 6.3 vs. 11.0 8.2 , 17.8 13.0 , P > 0.05 and P < 0.05 ; ICU stay ( days ) : 11.0 6.4 vs. 14.9 9.6 , 17.8 13.0 , respectively , P > 0.05 and P < 0.05 ] .