Dynamics of the Indicators of Low Dose Dobutamine Stress-Echocardiography under the Influence of High Doses of Atorvastatin in Patients with ST Elevation Myocardial Infarction

Abstract

The aim of investigation: to study the effect of early administration high doses of atorvastatin in the acute period of STEMI on the indicators of low dose dobutamine stress-echocardiography and parameters of left ventricular remodeling. Material and Methods: The study included 164 patients with STEMI All patients underwent myocardial revascularization (TLT or PCI) within the first 6 hours. The 1st group included 82 patients who received basic therapy (atorvastatin 20 mg), the 2nd group included 82 patients who took a loading dose of atorvastatin (at a dose of 80 mg per day). Low dose dobutamine stress-echocardiography was performed to detect myocardial stunning after stabilization of the patients condition on 4–6 days of the disease. In addition to general clinical and conventional laboratory research methods, on the 1st day and on the 10th day of treatment, the level of CPK MB, ESR, the number of blood leukocytes, and the level of fibrinogen (FN) were determined. Results: On the 10th day of therapy in patients of both groups, there was a significant increase in ESR (in the 1st group by 2.1 times, in the 2nd - by 1.6 times) and a decrease in the level of CRP (by 3 and 2.65 times, respectively) compared to the first day. The dynamics of these indicators reflects the regular processes of the course of AMI. A more significant change in these parameters was recorded in patients of the 2nd group who took atorvastatin at a dose of 80 mg. At the same time, on the 10th day of AMI, the number of peripheral blood leukocytes significantly decreased in them (p<0.05 when compared between groups). The number of dobutamine-responsive segments (segments with reversible dysfunction) in the group of patients treated with atorvastatin at a dose of 80 mg during myocardial reperfusion was significantly higher than in the control group (p<0.05). Conclusion: It was revealed that conducting of myocardium reperfusion in infarct-related coronary artery with simultaneous use of atorvastatin’s high doses promoted the limitation of myocardial necrosis development, reducing ischemic and reperfusion injuries of myocardium and influenced on the formation of myocardial stunning zones which is a reversible disfunction. The use of atorvastatin in the dose of 80 mg/per day in the first hours after acute myocardial infarction development promotes the improvement of LV systolic indices, prevents the progressing of LV cavity postinfarction dilatation.