Abstract
We report a simple method for adjusting the weight input of the Marsh target-controlled infusion (TCI) model such that the resulting infusion regime closely mimics the behaviour of the Eleveld model, thereby making the Marsh model more precise for patients at the extremes of age and body mass index. To assess the performance of our method, we simulated 2768 subjects with diverse combinations of age, weight, height and sex undergoing a hypothetical four-hour propofol TCI using both the Marsh model with our weight adjustment and the Eleveld model. The weight adjusted Marsh model produced infusion regimes and corresponding effect site concentrations closely mimicking that of the Eleveld model at all time points, with median and maximum absolute performance errors less than 8.1% and 20.3%, respectively, across the entire cohort. Our weight adjustment method is a simple and robust way of improving the precision of the Marsh model in patients at extremes of age and body mass index, until general purpose TCI models for propofol, such as the Eleveld model, become more widely available in commercial infusion pumps.
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Acknowledgements
We acknowledge Profs Frank Engbers and Steven Shafer whose algorithms formed the basis of our MATLAB code.
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George Zhong and Xiabing Xu are co-authors of the freely available, open source Propofol Dreams app. The authors have no financial interests to disclose.
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Zhong, G., Xu, X. General purpose propofol target-controlled infusion using the marsh model with adjusted weight input. J Anesth 38, 275–278 (2024). https://doi.org/10.1007/s00540-024-03312-w
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DOI: https://doi.org/10.1007/s00540-024-03312-w