Assessing the accuracy of a computerized decision support system for digoxin dosing in primary care: an observational study. Kroese, W. L. G., Avery, A. J., Savelyich, B. S. P., Brown, N. S., Schers, H., Howard, R., Hippisley-Cox, J., & Horsfield, P. Journal of Clinical Pharmacy and Therapeutics, 30(3):279--283, June, 2005.
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BACKGROUND: This study was carried out as part of a European Union funded project (PharmDIS-e+), to develop and evaluate software aimed at assisting physicians with drug dosing. A drug that causes particular problems with drug dosing in primary care is digoxin because of its narrow therapeutic range and low therapeutic index. OBJECTIVES: To determine (i) accuracy of the PharmDIS-e+ software for predicting serum digoxin levels in patients who are taking this drug regularly; (ii) whether there are statistically significant differences between predicted digoxin levels and those measured by a laboratory and (iii) whether there are differences between doses prescribed by general practitioners and those suggested by the program. METHODS: We needed 45 patients to have 95% Power to reject the null hypothesis that the mean serum digoxin concentration was within 10% of the mean predicted digoxin concentration. Patients were recruited from two general practices and had been taking digoxin for at least 4 months. Exclusion criteria were dementia, low adherence to digoxin and use of other medications known to interact to a clinically important extent with digoxin. RESULTS: Forty-five patients were recruited. There was a correlation of 0.65 between measured and predicted digoxin concentrations (P \textless 0.001). The mean difference was 0.12 microg/L (SD 0.26; 95% CI 0.04, 0.19, P = 0.005). Forty-seven per cent of the patients were prescribed the same dose as recommended by the software, 44% were prescribed a higher dose and 9% a lower dose than recommended. CONCLUSION: PharmDIS-e+ software was able to predict serum digoxin levels with acceptable accuracy in most patients.
@article{kroese_assessing_2005,
	title = {Assessing the accuracy of a computerized decision support system for digoxin dosing in primary care: an observational study},
	volume = {30},
	issn = {0269-4727},
	shorttitle = {Assessing the accuracy of a computerized decision support system for digoxin dosing in primary care},
	doi = {10.1111/j.1365-2710.2005.00650.x},
	abstract = {BACKGROUND: This study was carried out as part of a European Union funded project (PharmDIS-e+), to develop and evaluate software aimed at assisting physicians with drug dosing. A drug that causes particular problems with drug dosing in primary care is digoxin because of its narrow therapeutic range and low therapeutic index.
OBJECTIVES: To determine (i) accuracy of the PharmDIS-e+ software for predicting serum digoxin levels in patients who are taking this drug regularly; (ii) whether there are statistically significant differences between predicted digoxin levels and those measured by a laboratory and (iii) whether there are differences between doses prescribed by general practitioners and those suggested by the program.
METHODS: We needed 45 patients to have 95\% Power to reject the null hypothesis that the mean serum digoxin concentration was within 10\% of the mean predicted digoxin concentration. Patients were recruited from two general practices and had been taking digoxin for at least 4 months. Exclusion criteria were dementia, low adherence to digoxin and use of other medications known to interact to a clinically important extent with digoxin.
RESULTS: Forty-five patients were recruited. There was a correlation of 0.65 between measured and predicted digoxin concentrations (P {\textless} 0.001). The mean difference was 0.12 microg/L (SD 0.26; 95\% CI 0.04, 0.19, P = 0.005). Forty-seven per cent of the patients were prescribed the same dose as recommended by the software, 44\% were prescribed a higher dose and 9\% a lower dose than recommended.
CONCLUSION: PharmDIS-e+ software was able to predict serum digoxin levels with acceptable accuracy in most patients.},
	language = {eng},
	number = {3},
	journal = {Journal of Clinical Pharmacy and Therapeutics},
	author = {Kroese, W. L. G. and Avery, A. J. and Savelyich, B. S. P. and Brown, N. S. and Schers, H. and Howard, R. and Hippisley-Cox, J. and Horsfield, P.},
	month = jun,
	year = {2005},
	pmid = {15896246},
	keywords = {Aged, Aged, 80 and over, Cardiotonic Agents, Decision Support Systems, Clinical, Digoxin, Female, Humans, Male, Middle Aged, Primary Health Care, Software Validation},
	pages = {279--283}
}

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