In the modern world, there is a rapid advance in the design and clinical introduction of a huge number of drugs that are able to cure a patient or to improve his/her health status on the one hand and to cause significant harm to his/her health on the other. Polypragmasy is the desire to enhance the efficiency of treatment and to help the patient recover from all developed diseases inevitably leads to the use of a large number of medications. At the present time, polypragmasy as a result of iatrogenia is a serious public health problem, as it is clinically manifested by a reduction in the effectiveness of pharmacotherapy, by the development of severe adverse drug reactions, and by a considerable increase in healthcare expenditures. The reason for the simultaneous prescription of multiple drugs may be comorbidity (multimorbidity), the availability of drugs, as well as clinical guidelines, manuals of professional medical associations, treatment standards that contain recommendations for using combination therapy with more than 5 drugs for only one disease in some cases, the efficiency of which corresponds to a high level of evidence. Currently, the fight against polypragmasy is one of the important tasks in rendering medical care to elderly and senile patients since it is a major risk factor of adverse drug reactions in this category of people. To minimize polypragmasy in elderly patients, it is necessary to use current methods for analyzing each prescription of a drug (the index of rational drug prescribing; an anticholinergic burden scale) and those for optimizing pharmacotherapy with the use of restrictive lists (Beers criteria, STOPP/START criteria) that will be able to reduce the number of errors in the administration of drugs and to maximize the efficiency and safety of pharmacotherapy.

This research was aimed to study prevalence and patterns of comorbid conditions in patients aged 65 years and older in multidisciplinary hospital, to estimate prevalence of polypharmacy and potentially inappropriate medication prescriptions. Retrospective analysis with medical information system DOCA+ have been performed on electronic case histories of 80 patients aged 65 years and older who were hospitalized in trauma and orthopedic department. Medication administration records have been investigated to identify potentially inappropriate medication prescription according to «STOPP/START» criteria (2014) and Beers criteria (2015). The study demonstrated that 90% of elderly patients, hospitalized because of diseases of the musculoskeletal system, were comorbid, the average number of diseases in one patient was 5.9 ± 2,6: 2 diseases had 6% of patients, 3-5 - 36%, 6-8 - 36% and more than 8-22%. Most commonly, elderly and senile patients were diagnosed with diseases of the cardiovascular system (85%) in different combinations. Average amount of medications administered to one patient equaled 6.8 ± 2.7, polypharmacy was detected in 50% of cases. Investigation of drug prescriptions using the «STOPP/START» and Beers criteria found that in 53.8% and 70.0% of cases, respectively, elderly patients were administered with potentially inappropriate medications. Our research has shown that comorbidity and polypharmacy, which can impact on disease outcome and quality of life, are characteristics for elderly patients. In order to manage polypharmacy and reduce the frequency of adverse drug reactions tools such as «STOPP/START» and Beers criteria should be used for drug therapy optimization.

Introduction. Liver damage can be a dangerous side effect of using isoniazid. Individual susceptibility to isoniazid in humans is dependent on the presence of N-acetyltransferase 2 allelic variants in genome. It was imperative to assess the effect of genetically determined isoniazid acetylation rate in terms of risk of developing isoniazid-induced hepatotoxicity, as well as prevention of potential hepatopathy, and improvement of tuberculosis chemotherapy safety. Aim. To study the effect of acetylation type on the incidence of isoniazid hepatotoxicity in residents of the Sakha Republic (Yakutia) with newly diagnosed pulmonary tuberculosis. Methods. The study included 112 patients with newly diagnosed pulmonary tuberculosis. Genotyping was performed using real-time polymerase chain reaction. The following single nucleotide polymorphisms were studied: rs1801280, rs1799930, rs1799931, rs1799929, rs1208, rs1041983. Hepatotoxicity was determined based on the results of clinical laboratory monitoring and using the criteria developed by the European Association for the Study of the Liver (2019). Results. Hepatotoxic reactions developed more often in slow acetylators (43.2%), compared to fast acetylators (20.7%) and intermediate acetylators (10.9%); p=0.002. Serum alanine aminotransferase activity was 5 or more times above the upper limit of normal activity in 37.8% of slow acetylators, and in 8.7% of intermediate acetylators; p=0.001. Clinical manifestations of isoniazid hepatotoxicity were observed more often in slow acetylators (29.7%), than in fast acetylators (3.4%); p=0.000. Conclusion. Slow acetylation type ought to be considered an important risk factor for developing isoniazid hepatotoxicity in patients with pulmonary tuberculosis.

Tuberculosis remains one of the most dangerous and widespread infectious diseases. More than 20 medicinal products are currently available for the treatment of tuberculosis. One of the most serious adverse drug reactions (ADRs) associated with anti-tuberculosis medicines is hepatotoxicity.The aim of the study was to assess the effect of polymorphic markers of the NAT2 gene on the ADR risk in patients with pulmonary tuberculosis who received isoniazid and rifampicin.Materials and methods. The study included 67 patients with different forms of pulmonary tuberculosis who received combination therapy with isoniazid and rifampicin. Single nucleotide polymorphisms (SNPs) of the NAT2 gene were determined by real-time PCR. Statistical processing was performed using SPSS Statistics 20.0.Results: Six SNPs were identified in the NAT2 gene. Based on these SNPs the following phenotypes were determined by the rate of NAT2 acetylation: fast acetylators—6 subjects, intermediate acetylators—24 subjects, and slow acetylators—37 subjects. The study assessed the relationship between the acetylator phenotype and the development of ADRs during combination therapy with isoniazid and rifampicin. Slow acetylators had a significantly greater increase in total bilirubin level (p=0.011) compared to intermediate acetylators. Loss of appetite was more often observed in fast acetylators than in intermediate acetylators (p=0.021).Conclusions. The obtained data suggest interrelation between the slow type of NAT2 acetylation and the risk of ADRs in patients undergoing pulmonary tuberculosis chemotherapy with isoniazid and rifampicin. Out of all the ADRs registered in the study, the fast acetylators were more likely to have loss of appetite, however, the expansion of the study population is needed to verify this observation. The studied polymorphisms have an impact on the development of ADRs in patients undergoing pulmonary tuberculosis chemotherapy with isoniazid and rifampicin and may be used to predict the safety profile of pharmacotherapy in this group of patients.

Background. Tuberculosis therapy can lead to considerably dissimilar outcomes among individual patients. Some patients benefit from anti-tuberculosis chemotherapy leading to a desired therapeutic effect, while other patients show insufficient or absent response, or develop adverse side effects. Individual response to isoniazid is affected by mutations in the gene encoding N-acetyltransferase 2 (NAT2). Wide variations were observed in distributions of polymorphic NAT2 alleles in human populations depending on race, ethnicity, or geographical origin. No data are available to date on prevalence of NAT2 gene polymorphic variants and acetylation types in Yakut (Sakha) patients with newly diagnosed pulmonary tuberculosis. Aims: the frequencies of NAT2 polymorphic SNPs as well isoniazid acetylation phenotypes were evaluated in the patients cohort of Yakut ethnicity with newly diagnosed pulmonary tuberculosis (PTB). The comparison with, other ethnic groups of Asian origin was done. Methods. Cross-sectional study was conducted among Yakut patient cohorts with newly identified pulmonary tuberculosis. Using real-time PCR the following SNPs were explored: NAT2*5 (rs1801280, Т341С), NAT2*6 (rs1799930, G590A), NAT2*7 (rs1799931, G857A), NAT2*11 (rs1799929, C481T), NAT2*12 (rs1208, A803G), NAT2*13 (rs1041983, C282T). Genetically determined metabolic rates were calculated using NATpred online tool. Results. NAT2 SNPs were assessed, namely *5, *6, *7, *11, *12, and *13. The most frequent in Yakut patients were NAT2*6 and NAT2*13 SNPs (40.9% and 64.4%, respectively). Significant differences were detected in frequencies of NAT2 *5, *11, *12 polymorphisms; all studied NAT2 gene polymorphisms showed meaningful differences in genotype and minor allele prevalence rates after comparison between Yakut population and other Mongoloid ethnic groups (populations of China, Japan, Vietnam). High prevalence of intermediate acetylation type among ethnic Yakuts (58.3%) was established. Conclusions. Certain distinct differences in allelic variants of NAT2 gene and acetylation type prevalence in patients of Yakut ethnic origin newly diagnosed with pulmonary tuberculosis let conclude that the existing genotyping and phenotyping data from studies among other Mongoloid populations cannot be implicitly extrapolated on Yakut people. Pharmacogenetic data on individual response to drugs in Yakut patients should be made use of in clinical practice, to develop personalized isoniazid administration algorithms, with a final goal to make treatment more effective and safe.

Основными причинами развития устойчивых микобактерий туберкулеза являются неадекватный режим химиотерапии, преждевременное прекращение и/или перерыв в лечении, отсутствие необходимого ассортимента и