GRK5 and hydrops fetalis: When the subgroups with systolic dysfunction and diastolic dysfunction were compared with GRK5 polymorphism genotypes (AA and AT/TT), it was evident that the HF patients with AA genotype under both the subgroups indicated the lower hospitalization-free survival than the HF patients with AT/TT genotype under both subgroups (log-rank p=0.0002; Figure 7B).