Heparin-Induced Hyperkalemia Assessment Utilizing the Naranjo Adverse Drug Reaction Probability Scale: A 40-Year Systematic Review.

Background: Adverse drug reactions have been reported as leading causes of morbidity and mortality. Unfractionated heparin- and low-molecular-weight heparin-induced hyperkalemia are side effects that have been reported in approximately 7 to 8% of heparin-treated patients. Algorithms, assessment tools, and decision aids are needed to assist in determining the causality of these adverse drug reactions.

Aim: The aim of this study was to determine the number of case reports of hyperkalemia resulting from unfractionated heparin or low-molecular-weight heparin use by utilizing the Naranjo Adverse Drug Reaction Probability Scale.

Methods: PubMed, International Pharmaceutical Abstracts, and the Cochrane Library were searched for relevant publications. Search terms and Boolean operators, including "hyperkalemia AND heparin", "hyperkalemia AND low molecular weight heparin", "heparin AND hypoaldosteronism", and "low molecular weight heparin AND hypoaldosteronism", were used. Searches were limited to case reports and human specimens.

Results: A total of 29 case reports were identified, incorporating 38 patient cases. Of the 38 patient cases, 5 [4 involving unfractionated heparin and 1 involving low-molecular-weight heparin] (13.2%) utilized the Naranjo Adverse Drug Reaction Probability Scale to identify the possibility of an adverse drug reaction occurring due to exposure to unfractionated or low-molecular-weight heparin as probable.

Conclusions: The available evidence suggests that clinicians' use of the Naranjo Adverse Drug Reaction Probability Scale to determine the potential of hyperkalemia occurring due to exposure to unfractionated heparin and low-molecular-weight heparin is limited. Clinicians should be encouraged to utilize an objective monitoring tool to help standardize assessment of causality for all adverse drug reactions.