A retrospective study involving 40 patients, based on the initial division of the patients into 2 groups: group I (N = 20) - high response to cardiac resynchronization therapy (CRT) and group II (N = 20) - lack of response to CRT. Criteria of CRT efficacy were: decrease in end-systolic left ventricular volume equal to or more than 15 %, relative increase in left ventricular ejection fraction equal to or greater than 10 %, decrease in functional class of chronic heart failure (NYHA) equal to 1 or greater. Low response of CRT was determined as the absence of criteria said above (the lack of positive dynamics in left ventricle diameters and volumes, ejection fraction, or it had a negative value in the form of further enlargement of the heart chambers and the reduction of its contractile capacity). The initial patient separation by the degree of response to cardiac resynchronization therapy suggests verification the hypothesis that a different response to CRT may be associated with the relative position of the ventricle electrodes and the parameters of ventricular myocardial dyssynchrony.
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