Время забора крови для проведения лекарственного мониторинга
ВРЕМЯ ЗАБОРА КРОВИ ДЛЯ ПРОВЕДЕНИЯ ЛЕКАРСТВЕННОГО МОНИТОРИНГА Пробы крови для TDM должны быть взяты в фазе выведения лекарственного препарата, так как уровень концентрации в этой фазе надежнее воспроизводится, чем уровни концентрации в фазе всасывания или распределения. Для определения фазы выведения необходимо знать время достижения Кmax, а также время резкого падения концентрации в результате перераспределения. Ошибки в определении времени забора крови (например, раньше времени достижения состояния равновесной концентрации или слишком рано после приема очередной дозы препарата) могут вводить в заблуждение при выборе дозировки. ЧАСТОТА ЛЕКАРСТВЕННОГО МОНИТОРИНГА Частота мониторинга зависит от фармакокине-тических особенностей лекарственного средства. Многие полагают, что TDM требует достаточно частых заборов крови, что прежде всего связано с опытом применения лития. Это лекарственное средство в какой-то мере уникально тем, что уровень его концентрации определяется различными независимыми факторами. Отсюда следует, что уровень концентрации лития в плазме крови зависит не только от дозировки и состояния почечной функции, но также и от состояния межтканевой жидкости, всасывания и выведения солей. Для большинства лекарственных средств концентрация является производным дозировки, а также индивидуального уровня метаболизма и выведения, которые относительно устойчивы. Примерами опосредованного действия других переменных являются заболевания, которые влияют на органы, важные для метаболизма или выведения (например, печень или сердце), или другой лекарственный препарат, получаемый больным и способный стимулировать или подавлять CYP ферменты, ответственные за биотрансформацию лекарственных средств.
Лекарственный мониторинг рекомендуется как стандартное исследование в тех случаях, когда препарат имеет относительно узкий терапевтический индекс и его клиренс в значительной степени зависит от индивидуальных особенностей. Для большинства лекарственных препаратов такой контроль рекомендуется проводить после того, как больной получает стабильную дозировку препарата на протяжении 5-7 периодов его полувыведения. Повторный контроль обычно проводится только по необходимости. Причинами для повторного контроля могут стать изменения в эффективности лекарственного средства или его переносимости, а также любые обстоятельства, которые могут повлиять на клиренс препарата (например, добавление второго лекарственного средства, которое может усиливать или подавлять метаболизм первого препарата, или развитие болезненного состояния, которое может отрицательно влиять на функцию левого желудочка сердца, печени или почек). За исключением этих ситуаций TDM не требует повторения, так как полученный показатель определяется функциями метаболизма и выведения у конкретного больного, которые являются воспроизводимым и достаточно устойчивым биологическим феноменом. Благодаря этому TDM используется для выявления нарушений больным режима приема лекарств. Необходимо подчеркнуть, что для многих лекарств подобный лабораторный анализ еще невозможен или данные об их фармакокинети-ческих свойствах недостаточны для интерпретации уровня концентрации лекарственного средства. ЗАКЛЮЧЕНИЕ В этой главе был сделан обзор важнейших фар-макокинетических принципов, имеющих отношение к большинству психотропных препаратов. Затем было показано различие между фармакодинамикой и фармакокинетикой. Понимание фармакокинетики лекарственного средства может способствовать безопасности и эффективности применения лекарственного препарата. Эти принципы как неотъемлемая часть планирования лечения и его контроля рассматриваются в следующих главах в связи с определенными видами лекарственной терапии.
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