NPPB and hydrops fetalis: Subsequently, the study utilized exosomes for the treatment of HF, and the findings revealed a significant increase in the expression of myocardial damage markers BNP and hs‐TnI, as well as inflammatory cytokines TNF‐α, IL‐6, IL‐1b, sST2, and Gal‐3 in the Dox‐induced injury group compared to the control group.