Efficacy of combined antihypertensive therapy in patients with type 2 diabetes mellitus and non-alcoholic fatty liver disease with various polymorphisms of the CYP2C9 gene
Authors: Lukonin I. A. , Skibitsky V. V. , Fendrikova A. V. , Shulga E. K. 
Published: June 2024

Background. The difficulty of achieving target blood pressure (BP) levels in patients with arterial hypertension (AH) is often due to their type 2 diabetes mellitus (T2DM) and non-alcoholic fatty liver disease (NAFLD). In turn, taking into account the individual genetic characteristics of the body helps to personalize treatment and make it more effective.

   Aim. To compare the antihypertensive efficacy of a fixed combination of amlodipine and olmesartan medoxomil (Aml/Ol-M) in patients with hypertension and T2DM, with and without NAFLD, depending on the polymorphism of the CYP2C9 gene.

   Materials and methods. The study included 139 patients with uncontrolled hypertension and concomitant T2DM; after diagnosis of NAFLD, they were randomized into 2 groups: without NAFLD (group 1, n=70), with NAFLD (group 2, n = 69). After discontinuation of previous ineffective antihypertensive therapy, they were prescribed a combination of Aml/Ol-M in doses of 5-10/20-40 mg/day. At baseline, 4, 8, 12 and 24 weeks, their office BP levels were determined; Also, at the initial visit and after 24 weeks of treatment, the main indicators of 24-hour blood pressure monitoring (ABPM) were measured. Patients who did not reach the blood pressure target within 12 weeks of therapy were excluded from the study. Those who continued to participate in the amplifierThe Rotor Gene-Q allele discrimination method revealed the following distribution of polymorphic variants of the CYP2C9 gene: *1/*1 was found in 52 and 47, *1/*2 – in 6 and 5, *1/*3 – in 5 and 6 subjects, for groups 1 and 2, respectively.

   Results. The initial levels of office BP values were significantly higher in patients of group 2 and amounted to 153,5 mm Hg for systolic and 93 mm Hg for diastolic blood pressure, compared with 145 mm Hg and 88 mm Hg those included in group 1. After 12 weeks of therapy, the achievement of target blood pressure was registered in 63 (90 %) patients of group 1 and in 58 (84,1 %) of group 2. After 24 weeks of observation, in both groups a beneficial effect of the studied combination of drugs on all indicators of ABPM was noted, but a more pronounced improvement was noted in patients with NAFLD. Along with this, significant improvements in daily blood pressure profiles were registered in both groups 1 and 2: an increase in the number of patients with the “dipper” profile and a decrease in the number of patients with the pathological “non-dipper” profile. The antihypertensive effectiveness of Aml/Ol-M has been demonstrated for all isolated allelic variants of the CYP2C9 gene.

   Conclusions. A 24-week study with the use of Aml/Ol-M demonstrated a high incidence of achieving office BP target values in patients with hypertension and T2DM, with and without NAFLD. However, a more pronounced decrease in ABPM levels was found in patients with NAFLD. Carriage of any of the identified polymorphic gene variantsCYP2C9 had no effect on the clinical effects of the studied combination.