ROLE OF FIBROUS MYOCARDIAL DISORGANIZATION IN FORMATION OF RHYTHM DISTURBANCE IN PREMATURE VENTRICULAR EXCITATION SYNDROMES

Aim. The aim of the study was to assess the markers of synthesis and degradation of collagen, the parameters of structural-functional status of myocardium in patients with Wolff-Parkinson-White (WPW) syndrome and phenomenon, as well as idiopathic atrial fibrillation (AF) and to evaluate their predictor value in the development of tachyarrythmias. Materials and methods. Seventy three patients were examined. The main group included 43 patients with premature ventricular excitation syndromes (16 with WPW phenomenon and 27 with WPW syndrome, mean age 25 ± 9,15 years, 29 (67 %) men and 14 (33 %) women). The comparison group joined 30 patients with “idiopathic” AF (mean age 28,8 ± 4,25 years, 67 % of men and 33 % of women) and practically healthy persons of the same age. To assess disturbance of fibrous matrix of the myocardium, quantitative value of tissue inhibitor of metalloproteinase-1 (TIMP-1), matrix metalloproteinase-9 (MMP-9) and carboxyterminal propeptide (PIP) - blood serum type I procollagen was studied. Structural-functional status of myocardium was investigated with echocardiographic method. Results. The study indicated participation of matrix metalloproteinases and their inhibitors in formation of structural-functional changes in the myocardium among WPW syndrome and phenomenon patients, with maximum dysbalance of type I collagen exchange registered in patients suffering from WPW syndrome combined with AF. When carrying out statistical processing, reliable difference between the indices of extracellular matrix status depending on WPW syndrome and phenomenon, as well as on the presence or absence of AF paroxysms against he background of ventricular preexcitation syndrome were found out. Conclusions. Presence of dysbalance of the fibrosis seromarkers, which correlate with geometry of the left atrium and have a predictor value for the development of atrial fibrillation with WPW, was stated.

Premature ventricular excitation syndromes, fibrosis seromarkers, structural-functional myocardial status