Nevertheless, PTH levels were correlated to HYDRA score (r = 0.28, p< 0.001), corrected serum calcium (r = −0.44, p < 0.001), and eGFR (r = −0.24, p < 0.001) in patients with AHF, whereas only HYDRA score remained significantly correlated to PTH plasma levels in patients with CHF (r = 0.27, p < 0.001). Here, PTH is linked to congestive heart failure.