CAV3 and hydrops fetalis: As illustrated in Table 2, the concentrations of Con43 + Cav3 EVs in coronary sinus were correlated with preoperative echocardiographic parameters associated with HF: GLS (r = 0.51; p < 0.001), LVEF (r = −0.43; p < 0.001), LAVI (r = 0.43; p < 0.001), E/é (r = 0.23; p = 0.039), and TR V-max (r = 0.30; p = 0.044).