Metabolic model for laboratory control of anti-ischaemic therapy effectiveness: a case study of nicorandil

Scientific relevance. A key anti-ischaemic mechanism of some medicinal products involves their effects on the metabolism of endothelial vasodilators, particularly the synthesis of nitric oxide from arginine and its precursor citrulline.Aim. The study was aimed to determine whether the plasma time course of guanidine derivatives (arginine precursors) is applicable to laboratory control of anti-ischaemic therapy effectiveness using a single oral dose of nicorandil in patients with coronary heart disease as a case study.Materials and methods. The authors used high-performance liquid chromatography to determine metabolites. Blood samples for analysis were obtained from 30 patients with angina pectoris (Grade II–III, Canadian Cardiovascular Society) and 30 healthy donors. All the study participants received a single oral dose of 20 mg nicorandil after 10 h of fasting.Results. At baseline, patients showed significantly higher plasma citrulline levels than donors. However, the elevated levels decreased to the healthy range after nicorandil administration. Plasma arginine levels in patients showed a statistically significant increase following nicorandil administration. Plasma homoarginine levels in patients remained reduced both before and after dosing. Nicorandil did not influence elevated levels of the endogenous nitric oxide synthase inhibitor (asymmetrical dimethylarginine).Conclusions. In addition to the established mechanisms responsible for altering cell metabolism, nicorandil enhances the contribution of citrulline to arginine resynthesis. It is reasonable to include citrulline and arginine, which are involved in the vasodilator response, in model schemes for laboratory control of the effectiveness of anti-ischaemic therapy

Метаболическая модель для лабораторного контроля эффективности антиишемической терапии на примере использования никорандила

A key anti-ischaemic mechanism of some medicinal products involves their effects on the metabolism of endothelial vasodilators, particularly the synthesis of nitric oxide from arginine and its precursor citrulline.The aim of the study was to determine whether the plasma time course of guanidine derivatives (arginine precursors) is applicable to laboratory control of anti-ischaemic therapy effectiveness using a single oral dose of nicorandil in patients with coronary heart disease as a case study.Materials and methods. The authors used high-performance liquid chromatography to determine metabolites. Blood samples for analysis were obtained from 30 patients with angina pectoris (Grade II–III, Canadian Cardiovascular Society) and 30 healthy donors. All the study participants received a single oral dose of 20 mg nicorandil after 10 h of fasting.Results. At baseline, patients showed significantly higher plasma citrulline levels than donors. However, the elevated levels decreased to the healthy range after nicorandil administration. Plasma arginine levels in patients showed a statistically significant increase following nicorandil administration. Plasma homoarginine levels in patients remained reduced both before and after dosing. Nicorandil did not influence elevated levels of the endogenous nitric oxide synthase inhibitor (asymmetrical dimethylarginine).Conclusions. In addition to the established mechanisms responsible for altering cell metabolism, nicorandil enhances the contribution of citrulline to arginine resynthesis. It is reasonable to include citrulline and arginine, which are involved in the vasodilator response, in model schemes for laboratory control of the effectiveness of anti-ischaemic therapy.Важным механизмом антиишемического действия некоторых препаратов является их влияние на метаболизм эндотелиальных факторов вазодилатации, в частности на образование оксида азота из аминокислоты аргинина и его предшественника цитруллина.Цель работы: изучение возможности использования показателей динамики гуанидиновых производных — предшественников аргинина — в плазме крови для лабораторного контроля эффективности антиишемической терапии на примере однократного перорального приема никорандила у пациентов с ишемической болезнью сердца.Материалы и методы: метаболиты определяли методом высокоэффективной жидкостной хроматографии в образцах крови, взятых у 30 пациентов со стенокардией напряжения II–III функционального класса. Референтной группой являлись 30 здоровых доноров. Никорандил использовали перорально в разовой дозе 20 мг после 10-часового голодания.Результаты: у пациентов исходный уровень цитруллина был достоверно выше, чем у здоровых доноров. После приема никорандила содержание цитруллина снижалось до уровня, не отличающегося от уровня в плазме крови здоровых доноров группы сравнения. Содержание аргинина в плазме крови пациентов после приема препарата достоверно возрастало. При этом у них сохранялся пониженный уровень гомоаргинина как до, так и после приема никорандила. Обнаружено также отсутствие влияния приема никорандила на уровень эндогенного ингибитора синтазы оксида азота — асимметричного диметиларгинина.Вывод: в дополнение к известным механизмам воздействия никорандила на клеточный метаболизм показано усиление участия цитруллина в ресинтезе аргинина. При оценке эффективности антиишемической терапии в модельную схему для лабораторного контроля целесообразно включать цитруллин и аргинин, которые являются участниками вазодилатационного ответа

Cohort profile. the ESC-EORP chronic ischemic cardiovascular disease long-term (CICD LT) registry

The European Society of cardiology (ESC) EURObservational Research Programme (EORP) Chronic Ischemic Cardiovascular Disease registry Long Term (CICD) aims to study the clinical profile, treatment modalities and outcomes of patients diagnosed with CICD in a contemporary environment in order to assess whether these patients at high cardiovascular risk are treated according to ESC guidelines on prevention or on stable coronary disease and to determine mid and long term outcomes and their determinants in this population