Please select the eligibility criteria that correspond to the clinical trial below.
Title: N/A
Brief Summary: Aldosterone receptor blockers reduce cardiac-related morbidity and mortality. Recently, we demonstrated that long-term low-dose spironolactone is clinically safe in many hemodialysis (HD) patients. In the present study, we assess whether low-dose spironolactone treatment reduces the high incidence of cardio- and cerebrovascular (CCV) morbidity and mortality in HD patients. The investigators' hypothesis is that aldosterone receptor blockade by spironolactone reduces the risk of both CCV morbidity and death among HD patients.


Options:
A: Inclusion Criteria:

* Hemodialysis patients undergoing 4-hour-long HD thrice a week for at least 2 years
* With an average serum potassium level (immediately before dialysis on the first day of the week) of \<6.5 mEq/l over the previous 2 months
* With a 24-hour urine output of \<500 ml

Exclusion Criteria:

* A history of noncompliance
* Unstable vascular access
* Hypotension
* Hepatic failure
* Active cancer
* Any life-threatening disease other than ESRD
B: Inclusion Criteria:

* Patients who having been on PD continuously for one month, urine volume\>600 ml/d, residual renal function\>2ml/min/1.73m2, blood pressure\>120/70mmHg, serum potassium levels\<5.5mmol/l, stable clinical condition.

Exclusion Criteria:

* Patients with infectious systemic disease, peritonitis during the preceding 1 month, who had taken ACEI/ARBs in the 3 preceding months, spirolactone in the 2 preceding weeks, intolerance to ACEI/ARBs, CHF, MI, malignant hypertension and stroke within the preceding 6 months.
C: Inclusion Criteria:

* Age \> 18
* Hospitalized for peritoneal catheter placement for peritoneal dialysis

Exclusion Criteria:

* Pregnancy
* Hiperkalemia (K\> 5.5meq/l)
* Intolerance to spironolactone
D: Inclusion Criteria:

1. Maintenance hemodialysis therapy for end-stage renal disease
2. Age 18-85 years
3. ≥3 calendar months since dialysis initiation. Note if a patient has been on dialysis for ≥3 but less than 6 calendar months, there must be no hospitalizations during the 6 weeks prior to screening, and no change in estimated dry weight (EDW) within 2 weeks of the screening date.
4. For women of childbearing potential, willingness to use a highly effective method of birth control for up to 4 weeks after the last dose to study drug.
5. Ability to provide informed consent

Exclusion Criteria:

1. Serum potassium ≥6.5 mEq/L within the 3 months prior to screening
2. Serum potassium level ≥6.0 mEq/L within 2 weeks prior to the baseline visit. If a potassium value is not available through routine clinical care during this 2-week period a potassium measurement will be performed as a research test.
3. Unscheduled dialysis for hyperkalemia within the 3 months prior to screening
4. Pre-dialysis systolic blood pressure \<100 mm Hg within 2 weeks prior to screening or at the baseline visit
5. 2 or more dialysis sessions within the month prior to screening with either 2 intra-dialytic measurements of systolic blood pressure \<80 mm Hg or muscle cramping, light-headedness, nausea or hypotension requiring infusion of saline or other intervention directed at hypotension
6. Current dual use of angiotensin converting enzyme inhibitor (ACEI) and angiotensin receptor blocker (ARB)
7. Current use of digoxin
8. Current use of spironolactone or eplerenone
9. Allergy to spironolactone
10. Inability to maintain dialysis machine blood flow ≥300 mL/min during any of the most recent 3 dialysis sessions prior to the screening visit as an indicator of vascular access dysfunction
11. Mitral valve repair or replacement
12. Severe mitral valve disease by echocardiography, coronary angiography or cardiac magnetic resonance imaging
13. Anticipated kidney transplant, change to peritoneal dialysis, or transfer to another dialysis unit within 9 months
14. Expected survival \<9 months
15. Pregnancy, anticipated pregnancy, or breastfeeding
16. Incarceration
17. Participation in another intervention study

Answer: A