Figure 3A depicts the relationship between PTH and progressive increase in HYDRA score in patients with AHF and CHF: the higher the HYDRA score, the higher the plasma concentrations of PTH (p < 0.001, ANOVA). Furthermore, the decrease in the eGFR values was related to the increase in HYDRA score (p < 0.001 ANOVA) (Figure 3B). Here, PTH is linked to congestive heart failure.