TNNI3 and hydrops fetalis: Elevated cTnI levels were found to be a marker associated with higher mortality at the 5‐year follow‐up in the univariate Cox regression analysis (HR: 2.67, 95% CI: 1.54‐4.63, P < 0.001), together with other variables, such as age, prior MI, prior HF and initial presentation with syncope, glycemia, eGFR and anemia.