The investigation included 56 patients with MI of lower localization and acute left ventricle failure (ALVF). Group A included 33 patients with primary coronary balloon angioplasty (PCBAP), in group B there were 23 patients with MI and ALVF without revascularization. Group A was divided into 2 subgroups--A1 (patients with history of IM) and A2 (patients without previous MI). On the first and on the 14th days echocardiographic investigation was performed in all the patients. Ejection fraction (EF) of the LV in dynamics by the 14th day of the disease increased in group A from 32.8 +/- 1.8% to 36.1 +/- 1.6% (p < 0.05) at the expense of subgroup A2 (32.1 +/- 2.6% on the first day and 37.5% +/- 1.9 on the 14th day, p < 0.05), while in subgroup A1 there were no substantial changes of EF. In group B, on the contrary, there was decreased EF of the LV. Most of the group A patients had many injuries of the coronary bed vessels. After PCBAP of the right coronary artery (RCA) the increase of EF was followed by an improvement of the local contractility of the LV myocardium not only in the infarction zone, but also in the segments with ischemic dysfunction in which blood flows from the infarction-independent artery with its collateral filling from RCA.
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