毛髪内薬物濃度モニタリングの方法論の確立と患者服薬歴・服薬状況把握への応用
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The human scalp hair is a useful tissue that retains the past dosage history over a rather long period of time, acting like a “tape-recorder”. It should be emphasized that the sampling of hair can be made noninvasively by cutting a few to several pieces of hair nearest to the scalp. Because the hair continues to grow at the rate of about 1 cm/month, each 1-cm hair length contains the drug corresponding to the amount ingested over a 1-month period when the hair is cut into 1-cm lengths successively from the scalp end. However, the hair growth rate is variable both within and between individuals, and the hair has its own growth cycle, i.e., 2 to 8 years or more of the growing stage and a few months of the resting stage. Therefore, the validity of the obtained results must always be considered cautiously, especially in relation to whether a resting phase hair might have been sampled. For obtaining information on the growth rate and stage of a hair, a drug that can be detected in the hair even after a short-term exposure to the drug has been found. These drugs are antimicrobial quinolones such as ofloxacin. By analyzing the axial distribution of ofloxacin along the hair shaft, we can expect to determine the so-called “tape-speed” and “uniformity of tape-running” of a single hair.
- 社団法人 日本薬理学会の論文
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