When CRRT on ECMO Is Not Enough for Potassium Clearance: A Case Report

Area of Science:

• Nephrology
• Critical Care Medicine
• Cardiovascular Surgery

Background:

• Continuous renal replacement therapy (CRRT) is a standard treatment for fluid and solute removal in critically ill patients.
• CRRT may also mitigate systemic inflammation in patients requiring extracorporeal membrane oxygenation (ECMO) support.
• This case highlights a scenario where CRRT and ECMO were insufficient to manage severe hyperkalemia.

Purpose of the Study:

• To report a case of refractory symptomatic hyperkalemia during extracorporeal membrane oxygenation (ECMO) support.
• To describe the inefficacy of continuous renal replacement therapy (CRRT) in managing severe hyperkalemia.
• To illustrate the successful adjunctive use of intermittent hemodialysis (IHD) in a complex critical care setting.

Main Methods:

• A case report of an adolescent patient experiencing severe hyperkalemia due to rhabdomyolysis.
• The patient was undergoing extracorporeal membrane oxygenation (ECMO) support.
• Continuous renal replacement therapy (CRRT) was initiated but found to be insufficient for potassium clearance.

Main Results:

• Addition of intermittent hemodialysis (IHD) proved effective in controlling hyperkalemia.
• The patient was successfully weaned from ECMO, CRRT, and IHD.
• Cardiac and renal function normalized following the intervention.

Conclusions:

• Continuous renal replacement therapy (CRRT) may be insufficient for achieving adequate potassium balance in certain critical conditions.
• Intermittent hemodialysis (IHD) should be considered as an additional therapy when CRRT is inadequate for hyperkalemia management.
• Utilizing separate access for IHD may enhance treatment efficacy.