| Outcome Measures: |
Primary: Prothrombin time, Prothrombin time is monitored in both of the LMWH and UFH arms, Pre-dialysis; the 2nd, 4th, 6th and 8th hours of dialysis|Activated partial thromboplastin time, Activated partial thromboplastin time is monitored in both of the LMWH and UFH arms, Pre-dialysis; the 2nd, 4th, 6th and 8th hours of dialysis|Anti-Xa level, Anti-Xa level is only monitored in the LMWH arm, Pre-dialysis; the 2nd, 4th, 6th and 8th hours of dialysis; 24 hours after administration of LMWH|Dialyser urea and creatinine clearances, Dialyser urea and creatinine clearances are evaluated in both of the LMWH and UFH arms, At 15 mins after starting hemodialysis and 15 mins before the end of hemodialysis|Dialyser thrombus score, Dialyser thrombus score is evaluated in both of the LMWH and UFH arms, At the end of hemodialysis (8th hour) |
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