IL2 and hydrops fetalis: In the chronic HF group, significantly lower cytokine concentrations were detected compared to both the acute HF and the control groups regarding IL-1 β (acute: p = 0.011, control: p = 0.002), IL-2 (acute: p = 0.002, control: p < 0.001) and IL-4 (acute: p = 0.025, control: p = 0.004) levels (Figure 4).