Background: Guideline-recommended hyperkalaemia management includes dietary potassium (K + ) restriction, bicarbonate correction, diuretics and K + binders with dose reduction of renin-angiotensin-aldosterone system inhibitors as a last resort. The extent to which these recommendations are implemented is uncertain, as real-world data on hyperkalaemia management are limited. The Tracking Treatment Pathways in Adult Patients with Hyperkalemia (TRACK) study is a multinational, prospective, longitudinal study that is being conducted to address this knowledge gap. We report the design and baseline cohort characteristics of this real-world study of hyperkalaemia management decision-making., Methods: This study enrolled participants within 21 days of an episode of hyperkalaemia in four European countries (UK, Spain, Germany, Italy) and the USA. During the 12-month follow up, data collected will include participant and healthcare provider characteristics (specialty and practice setting), hyperkalaemia treatment objectives and strategies, rationale for management decisions and indicators of response and patient-reported perceptions of their hyperkalaemia treatment., Results: The enrolled cohort includes 1330 participants, mean age 68 years, of whom 31% were women. At baseline, 6% reported heart failure, 55% chronic kidney disease, 29% both and 9% neither. Most participants (57%) were taking an angiotensin-converting enzyme inhibitor, angiotensin receptor blocker or angiotensin receptor/neprilysin inhibitor at baseline. Mineralocorticoid receptor antagonist use was lower (14%)., Conclusions: The prospective TRACK study will shed light on practitioners' hyperkalaemia management decision-making and assess the impact of their decisions on hyperkalaemia recurrence. Understanding practitioners' underlying thought processes will facilitate efforts to improve hyperkalaemia management.ClinicalTrials.gov: NCT05408039., Competing Interests: J.H. and M.P.B. receive salary support from CPC, a non-profit academic research organization affiliated with the University of Colorado, which receives research grant/consulting funding from Agios Pharmaceuticals, Alexion Pharma Good Kaisha, Amgen, Anthos Therapeutics, ARCA Biopharma, AstraZeneca Pharma India, AstraZeneca Pharmaceuticals, AstraZeneca UK, AstraZeneca, Produtos Farmaceuticos, Atentiv, Bayer, Bayer (Proprietary) Limited, Bayer Aktiengesellschaft, Bayer Pharma, Beth Israel Deaconess Medical Center, Better Therapeutics, Bionest Partners, Boston Clinical Research Institute, BMS, CellResearch, Cleerly, Colorado Department of Public Health and Environment, Cook Regentec, CSL Behring, Eidos Therapeutics, EPG Communication Holdings, Esperion Therapeutics, Faraday Pharmaceuticals, HeartFlow, Hummingbird Bioscience, Insmed, Ionis Pharmaceuticals, IQVIA, Janssen Pharmaceuticals, Janssen Research & Development, Janssen Scientific Affairs, Lexicon Pharmaceuticals, LSG, MedImmune, Medpace, Medscape, Merck Sharp & Dohme, Northwell Health, Novartis Pharmaceuticals, Novo Nordisk, Osiris Therapeutics, Pfizer, PPD Development, Prothena Biosciences, Regeneron, Regents of the University of Colorado, Sanifit Therapeutics, Sanofi, Silence Therapeutics, Stanford University, Stealth BioTherapeutics, Brigham & Women's Hospital, Thrombosis Research Institute, UCD iC42 Lab, University of Colorado Denver, University of Pittsburgh, VarmX and WraSer. J.H. also reports owning AstraZeneca stock. N.S., M.B., H.C. and A.-K.S. own AstraZeneca stock. A.B. has received consultant fees and grant/other support from Abbott, Association of the British Pharmaceutical Industry, Accentus Medical, Amgen, Amore Health, AstraZeneca, Bayer, Boehringer Ingelheim, BMS, Closer Still Media, Daiichi Sankyo, Health Smart, Janssen, Lattice Point, Lilly, Medtronic, McKinsey, MSD, Napp, Novartis, Novo Nordisk, Pfizer, Remedica, Sanofi Aventis and AirEmail. J.Bover received advisory and/or lecture fees and/or congress travel expenses from AbbVie, Amgen, AstraZeneca, Bayer, CSL-Vifor, GSK, Menarini, Rubió, Sanofi and Theramex. J.Butler has received consultant fees from Abbott, American Regent, Amgen, Applied Therapeutic, AskBio, Astellas, AstraZeneca, Bayer, Boehringer Ingelheim, Boston Scientific, BMS, Cardiac Dimension, Cardiocell, Cardior, CSL Behring, CVRx, Cytokinetics, Daxor, Edwards, Element Science, Faraday, Foundry, G3P, Innolife, Impulse Dynamics, Imbria, Inventiva, Ionis, Levator, Lexicon, Lilly, LivaNova, Janssen, Medtronics, Merck, Occlutech, Owkin, Novartis, Novo Nordisk, Pfizer, Pharmacosmos, Pharmain, Prolaio, Pulnovo, Regeneron, Renibus, Roche, Salamandra, Salubris, Sanofi, SC Pharma, Secretome, Sequana, SQ Innovation, Tenex, Tricog, Ultromics, Vifor and Zoll. P.M.F. has received consultant fees and grant/other support from Allena Pharmaceuticals, Alnylam, Amgen, AstraZeneca, Bayer, Gilead, Novo Nordisk, Otsuka Pharmaceuticals, Rocchetta and Vifor Fresenius and royalties as an author for UpToDate. L.F. serves on data safety monitoring boards for Novo Nordisk and Regeneron and owns Amgen stock. M.P.S. has received advisory board fees and honoraria from AstraZeneca, Bayer, Vifor Pharma Group and Boehringer Ingelheim/Lilly. N.T. has received grants/research support from the Canadian Institutes of Health Research, National Institutes of Health, Kidney Foundation of Canada, Bayer, AstraZeneca, Boehringer Ingelheim, Janssen Pharmaceuticals, Research Manitoba, Otsuka Pharmaceutical, Tricida and Lilly; honoraria or consultation fees from AstraZeneca, Bayer, Boehringer Ingelheim, GSK, Janssen Pharmaceuticals, Otsuka Pharmaceutical, Prokidney, Roche, Tricida and Lilly; and owns stock in ClinPredict, Klinrisk, Quanta, Marizyme, Mesentech, Renibus Therapeutics, PulseData and Tricida. W.C.W. has received consultant fees from Akebia, Anthos, Ardelyx, AstraZeneca, Bayer Boehringer Ingelheim, Cadrenal, GSK, Merck, Natera, Novartis, Pharmacosmos, Unicycive, Vera and Zydus., (© The Author(s) 2024. Published by Oxford University Press on behalf of the ERA.)