Please select the eligibility criteria that correspond to the clinical trial below.
Title: Three Anticoagulation Strategies for Hemodialysis in Patients at Risk of Hemorrhage: a Multicenter Randomized Trial
Brief Summary: The aim of our study is to assess three anticoagulation strategies for intermittent hemodialysis(IHD) in patients at risk of hemorrhage. A registry of consecutive hemodialysis patients with high risk of hemorrhage was conducted at the Guangdong General Hospital, the First Affiliated Hospital of Guangzhou University of Chinese Medicine, the Second Affiliated Hospital of Guangzhou Medicine University or Guangzhou Hospital of Chinese Medicine, between Sep 10, 2017 and June 30th,2018. In this multi-center prospective and randomized study, participants were randomly divided into three groups during IHD according to different anticoagulation, including with regular saline flushes, one stage regional citrate anticoagulation (RCA) and two-stage RCA.


Options:
A: Inclusion Criteria:

* Prevalent NHHD patients who have received \>1 year dialysis with unfractionated heparin as anticoagulant
* Age \>= 18
* Informed consent available

Exclusion Criteria:

* History of intolerance to LMWHs during HD
* Receiving warfarin or other oral anticoagulant
* Pregnant patients
B: Inclusion Criteria:

* Any permanent catheter inserted intravenous either femoral or jugular either for hemodialysis, replacement or chemotherapy.

Exclusion Criteria:

* History of central venous occlusion, contraindication of direct oral anticoagulants.
C: Inclusion Criteria:

* age\>=18 years
* intermittent hemodialysis patients that carry on a 4 hours hemodialysis procedure, 2-3 times one week.
* the therapy mode is hemodialysis，with a dialysis fluid more than 500ml/min and blood flow volume more than 3.5-4ml/min.kg；
* at risk of hemorrhage,including active hemorrhage(within 3 days),post-operation(within 3 days) and pre-invasive operation(within 7 days).

Exclusion Criteria:

* at high risk of citrate accumulation( total bilirubin \>60umol/L; lactic acid\>3mmol/L,）；
* use the drugs that impact the coagulation function within 7 days;
* serious hypocalcemia (serum calcium\<1.9mmol/L).
D: Inclusion Criteria:

* Patients requiring heparin free dialysis treatments on nephrologists' prescription,
* Chronic ESRD patients treated by maintenance hemodialysis for at least 3 months,
* Patients with a well functioning blood access that can allow a blood flow of at least 250 ml/min,
* Patients aged 18 years or more,
* Written consent to participate in the study (informed consent).

Exclusion Criteria:

* Patients in ICU settings,
* AKI patients,
* Patients dialyzed in self care, satellite HD units,
* Patients treated in single needle mode,
* Known heparin contraindication (HIT type II),
* Patients requiring blood and other labile blood products (i.e. fresh frozen plasma, platelets, etc ...) transfusion during hemodialysis treatment,
* Patients receiving oral anticoagulants (including Anti vitamin K),
* Patients receiving a combination of anti-platelets agents,
* Patients treated with unfractionated or low molecular weight heparin beside the dialysis treatment to prevent deep vein thrombosis,
* Pregnant/ planning pregnancy and lactating women during study period,
* Adult patients protected by the law,
* Patients are not affiliated to health insurance system (beneficiary or dependant)
* Participation in other interventional studies during the study period,
* Patients that have already been included in this study.

Answer: C