Please select the eligibility criteria that correspond to the clinical trial below.
Title: N/A
Brief Summary: Continuous renal replacement therapy (CRRT) has been considered as an effective modality for renal replacement therapy in hemodynamically unstable patients within intensive care unit (ICU) except for the necessity of anticoagulation. The severity and peculiarities of ICU patients often make it equivocal to use anticoagulation. This is a prospective randomized controlled study to show the difference in filter life span and adverse event between HF1000 (nafamostat mesilate) group and M100 (heparin-free) group.


Options:
A: Inclusion Criteria:

1. Critically ill patients with clinical indication for CRRT (clinical decision to use continuous RRT due to hemodynamic instability)

   Or

   Severe acute kidney injury (KDIGO 3-classification) despite optimal resuscitation
2. At least one of the following conditions

   * Sepsis or septic shock
   * Use of catecholamines (norepinephrine or epinephrine ≥ 0.1 µg/kg/min or norepinephrine ≥ 0.05 µg/kg/min + dobutamine (any dose) or norepinephrine ≥ 0.05 µg/kg/min + vasopressin (any dose) or epinephrine ≥ 0.05 µg/kg/min + norepinephrine ≥ 0.05 µg/kg/min)
   * Refractory fluid overload: worsening pulmonary edema: PaO2/FiO2 \< 300 mmHg and/or fluid balance \> 10% of body weight)
3. 18-90 years old
4. Intention to provide full intensive care treatment for at least 3 days
5. Written informed consent of the patient or the legal representatives or the authorized representative or the inclusion due to an emergency situation

Exclusion Criteria:

1. Patients with increased bleeding risk (e.g. an active bleeding from ulcers in the gastro-intestinal tract, hypertension with a diastolic blood pressure higher than 105 mm Hg, injuries (intracranial hemorrhage, aneurysm of brain arteries) of or surgical procedures on the central nervous system if a heparinization with a target aPTT 45-60 s is not allowed by the treating neurologist or neurosurgeon, severe retinopathies, bleeding into the vitreum, ophthalmic surgical procedures)) or injuries, active tuberculosis; infective endocarditis)
2. Disease or organ damage related with hemorrhagic diathesis (coagulopathy, thrombocytopenia, severe liver or pancreas disease)
3. Dialysis-dependent chronic kidney insufficiency
4. Need of therapeutic systemic anticoagulation
5. Allergic reaction to one of the anticoagulants or ingredients, Heparin-induced thrombocytopenia
6. AKI caused by permanent occlusion or surgical lesion of the renal artery
7. AKI caused by (glomerulo)nephritis, interstitial nephritis, vasculitis or postrenal obstruction
8. Do-not-resuscitate order
9. Hemolytic-uremic syndrome/thrombotic thrombocytopenic purpura
10. Persistent and severe lactate acidosis in the context of an acute liver failure and/or shock
11. Kidney transplant within the last 12 months
12. Pregnancy and nursing period
13. Abortus imminens
14. No hemofiltration machine free for use at the moment of inclusion
15. Participation in another clinical intervention trial in the last 3 months
16. Persons with any kind of dependency on the investigator or employed by the sponsor or investigator
17. Persons held in an institution by legal or official order
B: Inclusion Criteria:

* Patients who were admitted to the intensive care unit and required CRRT

  1. active bleeding such as gastrointestinal bleeding and intracranial hemorrhage,
  2. activated partial thromboplastin time \> 60 s,
  3. prothrombin time-international normalized ratio \> 2.0,
  4. thrombocytopenia (\<100,000/µL), and
  5. surgery within 48 h before CRRT.

Exclusion Criteria:

* Pregnant or possibly pregnant women
* Patients who were allergic to nafamostat mesilate
* Patients who were hypercoagulable
C: Inclusion Criteria:

* patients who have at least one of the hemorrhagic tendencies of following conditions and needs CRRT hemodynamically;

  1. Platelet count \< 100,000
  2. aPTT \> 60 sec
  3. PT-INR \> 2.0
  4. active hemorrhage
  5. surgery within 48 hours
  6. cerebral hemorrhage within 3 months or history of major bleeding
  7. septic shock or DIC.

Exclusion Criteria:

* pregnancy, breast feeding, possibility of pregnancy,
* allergy to nafamostat mesilate,
* other conditions that physician consider unfit for candidate.
D: Inclusion Criteria:

1. Injury stage of RIFLE criteria or more: \> 2-fold increase in the serum creatinine or urine output \< 0.5 mL/kg/hr for 12 hours
2. Patients with any dialysis treatment before admission to the ICU or patients with end-stage renal failure and receiving dialysis
3. Informed consent has been obtained.

Exclusion Criteria:

1. patient age \< 20 years or \> 85 years
2. life expectancy less than 3 months (ex. terminal stage of malignancy)
3. Child-Pugh class C liver cirrhosis
4. pregnancy or lactation
5. history of anticoagulation prior to the randomization
6. bleeding tendency (platelet count \< 50,000/ul, INR \> 2.5, PTT \> 65, or fibrinogen \< 1.00 g/L)
7. history of hemorrhagic disease (ex. GI bleeding, cerebral hemorrhage, pulmonary hemorrhage)

Answer: C