In conclusion, the novelty in our study results is the increase of IL-9 and decrease of IL-5, IL-7, and IFN-γ plasma levels, in both ICM and NIDCM CHF patients vs controls and the inverse correlation of IL-5 and IL-9 plasma levels with duration of disease and LVEF, respectively, in ICM patients. Here, IL9 is linked to congestive heart failure.