SZC for High Potassium in Heart Failure Patients
(REALIZE-K Trial)

Recruiting in Palo Alto (17 mi)

+102 other locations

Age: 18+

Sex: Any

Travel: May Be Covered

Time Reimbursement: Varies

Trial Phase: Phase 4

Waitlist Available

Sponsor: AstraZeneca

No Placebo Group

Prior Safety Data

Approved in 2 Jurisdictions

Trial Summary

What is the purpose of this trial?

This trial tests if SZC can keep potassium levels normal in heart failure patients taking spironolactone. SZC acts like a sponge to soak up extra potassium and remove it from the body. SZC is a newly introduced treatment that effectively lowers and maintains normal potassium levels in patients with high potassium.

Research Team

Eligibility Criteria

Adults over 18 with heart failure and high potassium levels, taking specific heart medications, can join this trial. They must have a stable blood pressure and not be hospitalized for unstable heart conditions or on certain intravenous drugs.

Inclusion Criteria

Your potassium and kidney function levels need to be within certain ranges.

I have heart failure symptoms that have lasted for at least 3 months.

For group 2: Your blood potassium levels are normal at the start of the study, but you are at risk of developing high blood potassium levels.

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Exclusion Criteria

You have had a heart transplant or have a heart device implanted, or you are planning to have these procedures after joining the study.

My heart failure is caused by a specific heart condition.

I am currently hospitalized with unstable heart failure.

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Treatment Details

Interventions

Sodium zirconium cyclosilicate (Electrolyte Modifying Agent)

Trial OverviewThe study tests if SZC keeps potassium levels normal in patients with symptomatic HFrEF who are also taking spironolactone. Participants will either receive SZC or a placebo to compare effectiveness without rescue therapy.

Participant Groups

2Treatment groups

Experimental Treatment

Group I: Randomized withdrawal phase (6 months)Experimental Treatment3 Interventions

SZC arm and Placebo arm: Patients will continue on the SZC dose they were receiving at the end of the run-in phase. The SZC / Placebo dose will be adjusted as needed to maintain normokalemia (dose range = 5 g every other day, to 5-15 g once daily).

Group II: Open-label run-in phaseExperimental Treatment3 Interventions

Cohort 1 (4 weeks duration): Patients who are hyperkalemic at study entry will begin SZC 10 g TID for up to 48 hours followed by SZC 10 g once daily to achieve and maintain normokalemia. The SZC dose will be adjusted as needed to maintain normokalemia (dose range = 5 g every other day, to 5-15 g once daily). Cohort 2 (up to 6 weeks duration): Patients who develop hyperkalemia during the uptitration of spironolactone will receive SZC 10 g TID for up to 48 hours followed by SZC 10 g once daily to achieve and maintain normokalemia. The SZC dose will be adjusted as needed to maintain normokalemia (dose range = 5 g every other day, to 5-15 g once daily).