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Among 306 HD patients,31 fluid overloaded patients(IVCe>16mm) with a reduced EF (EF<55%) were chosen for DW optimization(WTBZTable 1).The etiology of chronic renal failure in these patients was as follows:chronic glomerulonephritis 24,diabetic nephropathy 5,lupus nephritis 1,and polycystic kidney 1. No β-blockers were used during the study period.In these patients,DW was reduced to achieve an interdialytic IVCe<16mm.rn