The aim – was to investigate the possible association of the aldosterone synthase gene (CYP11B2) polymorphism and the recessive pattern of inheritance with left ventricular diastolic function in patients with coronary heart disease and postinfarction cardiosclerosis (PIC).
Material and methods. One hundred patients (age 57.3±8.9 years) were examined by general clinical methods. The study included patients with a history of myocardial infarction for more than 6 months and up to 2 years from the date of the event. Genetic testing was performed by polymerase chain reaction in real mode. The study material was venous blood of patients with coronary heart disease, PIC. Echocardiography was done for the evaluation of diastolic function in all patients.
Results. The E wave velocity parameters were higher among patients with TT + TC genotype compared to the data of patients with CC genotype. The wave-velocity parameters A were higher, and DT was longer in patients with CC variant of the genotype compared to the TT + TC variant of the aldosterone synthase gene polymorphism, which indicates a greater frequency of LV relaxation disturbance in patients with CC variant of polymorphism compared to TT + TC variant of the genotype. The indices of higher diastolic LV diastolic pressure, an increase in its preload (E/E´, AR) were higher in the group of patients with TT and TC, a variant of aldosterone synthase gene polymorphism. The patients with TT + TC variant of polymorphism more often encountered more severe forms of LV diastolic dysfunction (pseudonormalization, restriction) compared with the data of patients with a variant of polymorphism of the aldosterone synthase gene (P<0.0001), which indicates a more severe course of the disease in these patients. Conclusion. The risk of developing more severe forms of diastolic LV dysfunction in patients with TT + TC genotype CYP11B2 is higher, compared to the CC genotype in patients with IHD, PIC.