What causes decreased potassium excretion in patients with hyperkalemia (high serum potassium level)?

Answer

Almost all patients who present with persistent hyperkalemia have impaired renal excretion of potassium. Mild degrees of renal failure generally do not result in resting hyperkalemia, because of compensation by adaptive mechanisms in the kidneys and GI tract. However, once the GFR falls below 15-20 mL/min, significant hyperkalemia can occur, even in the absence of an abnormally large potassium load. The simple lack of nephron mass prevents normal potassium homeostasis.

Other mechanisms, such as drug effects or renal tubular acidosis, can decrease renal potassium excretion and cause hyperkalemia even in individuals with normal or only mildly decreased renal function. Two other causes of decreased excretion of potassium are reduced distal sodium delivery and reduced tubular fluid flow rate.

Medications that can decrease potassium excretion include the following:

Potassium-sparing diuretics (eg, spironolactone, triamterene, amiloride)
NSAIDs
ACE inhibitors
Angiotensin-receptor blockers (ARBs)
Cyclosporine or tacrolimus
Pentamidine
Trimethoprim-sulfamethoxazole
Heparin
Ketoconazole
Metyrapone
Herbs

In a study of 396 consecutive patients with heart failure who were taking renin-angiotensin-aldosterone system inhibitors (RAASi), 26% developed hyperkalemia of 5.5 mmol/L or greater and 12% developed hyperkalemia of 6.0 mmol/L or greater, over mean follow-up of 6.9 years. Independent risk factors for hyperkalemia included diabetes mellitus (odds ratio [OR] = 1.80, 95% CI = 1.03-3.19) and elevated baseline creatinine (OR = 2.37, 95% CI = 2.37-3.85).^[30]

Initial analysis of data on 9222 outpatients in a European heart failure registry showed that hyperkalemia was independently associated with higher mortality. After adjusting for discontinuation of RAASi discontinuation, however, hyperkalemia was no longer associated with mortality, suggesting that hyperkalemia may be a risk marker for RAASi discontinuation rather than a risk factor for worse outcomes.^[31]

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Media Gallery

Widened QRS complexes in patient whose serum potassium level was 7.8 mEq/L.
ECG of patient with pretreatment potassium level of 7.8 mEq/L and widened QRS complexes after receiving 1 ampule of calcium chloride. Note narrowing of QRS complexes and reduction of T waves.
Hyperkalemia diagnosis and treatment flow chart.
Widened QRS complexes in hyperkalemia.

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Author

Eleanor Lederer, MD, FASN Professor of Medicine, Chief, Nephrology Division, Director, Nephrology Training Program, Director, Metabolic Stone Clinic, Kidney Disease Program, University of Louisville School of Medicine; Consulting Staff, Louisville Veterans Affairs Hospital

Eleanor Lederer, MD, FASN is a member of the following medical societies: American Association for the Advancement of Science, American Federation for Medical Research, American Society for Biochemistry and Molecular Biology, American Society for Bone and Mineral Research, American Society of Nephrology, American Society of Transplantation, International Society of Nephrology, Kentucky Medical Association, National Kidney Foundation, Phi Beta Kappa

Disclosure: Serve(d) as a director, officer, partner, employee, advisor, consultant or trustee for: American Society of Nephrology<br/>Received income in an amount equal to or greater than $250 from: Healthcare Quality Strategies, Inc<br/>Received grant/research funds from Dept of Veterans Affairs for research; Received salary from American Society of Nephrology for asn council position; Received salary from University of Louisville for employment; Received salary from University of Louisville Physicians for employment; Received contract payment from American Physician Institute for Advanced Professional Studies, LLC for independent contractor; Received contract payment from Healthcare Quality Strategies, Inc for independent cont.

Coauthor(s)

Zygimantas C Alsauskas, MD Assistant Professor of Medicine, Division of Nephrology, Kidney Disease Program, University of Louisville School of Medicine

Zygimantas C Alsauskas, MD is a member of the following medical societies: American Society of Nephrology

Disclosure: Nothing to disclose.

Lina Mackelaite, MD Assistant Professor of Medicine, University of Louisville School of Medicine

Lina Mackelaite, MD is a member of the following medical societies: American Society of Hypertension, American Society of Nephrology, American Society of Transplantation, National Kidney Foundation

Disclosure: Nothing to disclose.

Vibha Nayak, MD Assistant Professor of Nephrology, Director of Home Dialysis, Kidney Disease Program, University of Louisville School of Medicine

Vibha Nayak, MD is a member of the following medical societies: American Society of Nephrology

Disclosure: Nothing to disclose.

Specialty Editor Board

Mary L Windle, PharmD Adjunct Associate Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Nothing to disclose.

Chief Editor

Vecihi Batuman, MD, FASN Huberwald Professor of Medicine, Section of Nephrology-Hypertension, Interim Chair, Deming Department of Medicine, Tulane University School of Medicine

Vecihi Batuman, MD, FASN is a member of the following medical societies: American College of Physicians, American Society of Hypertension, American Society of Nephrology, International Society of Nephrology, Southern Society for Clinical Investigation

Disclosure: Nothing to disclose.

Acknowledgements

Son Dinh, MD Nephrologist, Southland Renal Medical Group, Inc

Son Dinh, MD is a member of the following medical societies: American Society of Nephrology and National Kidney Foundation

Disclosure: Nothing to disclose.

Anil Kumar Mandal, MD Clinical Professor, Department of Internal Medicine, Division of Nephrology, University of Florida School of Medicine

Anil Kumar Mandal, MD is a member of the following medical societies: American College of Clinical Pharmacology, American College of Physicians, American Society of Nephrology, and Central Society for Clinical Research

Disclosure: Nothing to disclose.

Rosemary Ouseph, MD Professor of Medicine, Director of Kidney Transplant, University of Louisville School of Medicine

Rosemary Ouseph, MD is a member of the following medical societies: American Society for Bone and Mineral Research, American Society of Nephrology, and American Society of Transplant Surgeons

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Medscape Salary Employment

Christie P Thomas, MBBS, FRCP, FASN, FAHA Professor, Department of Internal Medicine, Division of Nephrology, Medical Director, Kidney and Kidney/Pancreas Transplant Program, University of Iowa Hospitals and Clinics

Christie P Thomas, MBBS, FRCP, FASN, FAHA is a member of the following medical societies: American College of Physicians, American Heart Association, American Society of Nephrology, and Royal College of Physicians

Disclosure: Nothing to disclose.

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