AUDIENCE: Nephrology, Nursing
ISSUE: FDA is notifying health care providers to consider the presence and quantity of acetate, citrate, and/or acetic acid in dialysate concentrates when determining the patients’ dialysate prescription. The FDA received a complaint describing alkali dosing errors that occurred during hemodialysis using dialysate concentrates containing acetic acid and acetate. When metabolized, these potential sources of alkali can contribute to elevated bicarbonate levels in patients undergoing hemodialysis. This can contribute to metabolic alkalosis, which is a significant risk factor associated with cardiopulmonary arrest, low blood pressure, hypokalemia, hypoxemia, hypercapnia, and cardiac arrhythmia.
BACKGROUND: Dialysate is a solution prescribed by physicians for use in the treatment of acute and chronic renal failure during the hemodialysis procedure. The dialysate solution is used in combination with the hemodialysis machine and dialyzer to remove wastes from the blood.
Dialysate acid concentrate can contain acetic acid, acetate or citrate, and that these substances can be converted in the body to bicarbonate, potentially contributing to metabolic alkalosis. These substances typically are found in acid concentrate in amounts ranging from 1.5 to 8 mEq/L. This potential exists for all currently marketed dialysate concentrate products containing acetate, acetic acid, or citrate.
RECOMMENDATION: Health care providers should review the dialysate acid concentrate labeling for the specific concentrate that they prescribe to determine the components that can contribute to the patient’s overall bicarbonate levels. The levels of acetate, citrate and/or acetic acid vary by formulation and by manufacturer. Be aware that metabolic alkalosis (pre-dialysis serum bicarbonate levels > or = to 27 mEq/L) has been associated with a higher risk of death in hemodialysis patients.
Healthcare professionals and patients are encouraged to report adverse events or side effects related to the use of these products to the FDA's MedWatch Safety Information and Adverse Event Reporting Program:
- Complete and submit the report Online: www.fda.gov/MedWatch/report.htm 
- Download form  or call 1-800-332-1088 to request a reporting form, then complete and return to the address on the pre-addressed form, or submit by fax to 1-800-FDA-0178
[05/25/2012 - Safety Communication  - FDA]