Abstract
Background
Digoxin is a cardiac glycoside that was introduced to cardiovascular medicine more than 200 years ago. Its use is associated with large variability, which complicates achieving the desired therapeutic outcomes.
Objectives
To present a synthesis of the available literature on the population pharmacokinetics of digoxin in adults and to identify the sources of variability in its pharmacokinetics.
Methods
This is a PROSPERO registered systematic review (CRD42018105300). A literature search was conducted using the ISI Web of Science, Science Direct, PubMed, and SCOPUS databases to identify digoxin population pharmacokinetic studies of adults that utilized the nonlinear mixed-effect modeling approach.
Results
Sixteen articles were included in the present analysis. Only two studies were conducted in elderly subjects as a separate population. Both the pharmacokinetics and pharmacodynamics of digoxin were investigated in one study. Furthermore, the reviewed studies were mostly conducted in East Asian populations (68.8%). Digoxin's pharmacokinetics were usually described by a one-compartment model because of the nature of the collected data. Weight, age, kidney function, presence of heart failure, and co-administered medications such as calcium channel blockers were the most commonly identified predictors of digoxin clearance. The value of apparent clearance in a typical study individual ranged from 0.005 to 0.2 l/h/kg, while the value of the apparent volume of distribution ranged from 3.14 to 15.2 l/kg. The quality of model evaluation was deemed excellent only in 31.3% of the studies.
Conclusion
This review provides information about variables that need to be considered when prescribing digoxin. The results highlight the need for prospective studies that allow two-compartment pharmacokinetic/pharmacodynamic models to be established, with a special focus on the elderly subpopulation.
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Authors' contributions
Conceptualization: M.A.J. Conducting the review: M.A.J., N.A., M.A., K.A. Data analysis: M.A.J., N.A., M.A. Writing the manuscript: M.A.J., N.A., M.A., K.A. Reviewing and approving the manuscript: M.A.J., N.A., M.A., K.A.
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Abdel Jalil, M., Abdullah, N., Alsous, M. et al. Population Pharmacokinetic Studies of Digoxin in Adult Patients: A Systematic Review. Eur J Drug Metab Pharmacokinet 46, 325–342 (2021). https://doi.org/10.1007/s13318-021-00672-6
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DOI: https://doi.org/10.1007/s13318-021-00672-6