NPPB and hydrops fetalis: CoQ10 added to standard HF therapy did not improve NYHA functional class, exercise capacity or NT‐proBNP at 16 weeks, but in the longer term (median follow‐up 106 weeks) reduced the primary (composite) endpoint of hospitalization for worsening HF, cardiovascular death, mechanical assist implantation or urgent cardiac transplantation (HR: 0.50; 95% CI: 0.32−0.80; p = 0.003).