Although the entire HF-HD group showed a significant increase in the cTnT concentration during the prospective study, the cTnT increased in 36 patients (∆cTnT 0.022, 0.001–0.201 ng/ml), whereas in 22 patients, either no difference or a decrease in cTnT (∆cTnT −0.015, 0.000 to −0.046 ng/ml) was observed. The gene discussed is TNNT2; the disease is hydrops fetalis.