A Direct Injection Technique to Improve Biosafety to Analyze Levetiracetam Concentrations in Human Serum and Its Application in Therapeutic Drug Monitoring

Practice and experience in the teaching system of clinical pharmacy laboratory in the post-epidemic era: A review

Out of the global outbreak of COVID-19, clinical pharmaceutical therapeutic analytical-teaching laboratories underwent an increasing number of digitally-led teaching research. A teaching system working online and offline to monitor medicinal drugs was explored and established using a clinical pharmaceutical therapy through a drug concentration monitoring laboratory within a comprehensive tertiary hospital. Meanwhile, laboratory access training and standards of laboratory biosafety management system were also strictly implemented, improving the technical operation and daily management. Moreover, a new, significant, and efficient teaching mode was set up based on vocational training needs for efficient and professional learning. The learning results are enforced to have dynamic checks accomplished using stage-oriented assessment. Moreover, the questionnaire survey results, especially during independent learning ability and laboratory skills training, reveal that teachers and students have commented positively on the new teaching mode. Hereon, a clinical pharmaceutical teaching system during the Post-Epidemic Era was elaborated to provide a unique teaching mode and experience dedicated to teaching and scientific research in clinical therapeutic drug monitoring laboratory.

Relationship Between the Free and Total Methotrexate Plasma Concentration in Children and Application to Predict the Toxicity of HD-MTX

High-dose methotrexate (HD-MTX) can be highly effective as well as extremely toxic. Many drug molecules can bind to plasma proteins to different extents in vivo, whereas only the free drug can reach the site of action to exert a pharmacological effect and cause toxicity. However, free MTX concentrations in plasma have not been reported. Traditional analyses of free drugs are both cumbersome and inaccurate. We collected 92 plasma samples from 52 children diagnosed with ALL or NHL or other lymphomas that were treated with HD-MTX. The hollow fiber centrifugal ultrafiltration (HFCF-UF) was used to prepare plasma samples for analysis of the free MTX concentration. Protein precipitation was employed to measure the total MTX concentration. The HFCF-UF is a simple method involving a step of ordinary centrifugation; the validation parameters for the methodological results were satisfactory and fell within the acceptance criteria. A linearity coefficient r² of 0.910 was obtained for the correlation between the free and total MTX plasma concentrations in 92 plasma samples. However, the free and total MTX concentrations was only weakly correlated in 16 clinical plasma specimens with total MTX concentrations >2 μmol L⁻¹ (r² = 0.760). Both the free and total MTX concentrations at 42 h were negatively correlated with the creatinine clearance (CCr) level (P = 0.023, r = −0.236 for total MTX and P = 0.020, r = −0.241for free MTX, respectively). The free MTX concentration could not be accurately estimated from the total MTX concentration for patients with high MTX levels which are conditions under which toxic reactions are more likely to occur. High plasma MTX levels could become a predictor of the occurrence of MTX nephrotoxicity to draw people's attention. The proposed HFCF-UF method is a simple and accurate way to evaluate efficacy and toxicity in clinical therapeutic drug monitoring.