ANALYSIS OF FUNCTIONAL STATE OF CARDIOVASCULAR SYSTEM BY COLLECTION OF THE SIGNS OF PHASIC PORTRAIT IN SINGLE CHANNEL ECG

Aim. To study a diagnostic value of the parameters characterizing phasic ECG portrait of the first standard lead in assessment of efficiency of cardiovascular system functioning in persons with different level of adaptation potential.

Material and methods. Totally, 825 persons participated of the age 17-70 y.o. The group with cardiovascular pathology consisted with 99 persons of 50-70 y.o. with diagnoses CHD, PICS. In almost healthy group we included volunteers 17-50 y.o. (n=726), of those 35 soccer players (sports mastery) and 15 train drivers of 30-35 y.o. Registration and analysis of ECG in phasic area and defining of the original parameters βT , STR, αQRS and σQRS of phasic portrait of ECG was done via diagnostic complex PHASAGRAPH® . In train drivers the mentioned parameters of phasic portrait were recorded before and after six-hour shift. In almost healthy persons, young men and male sportsmen additionally we recorded the studied parameters continuing exercise test with gradually increasing load. Additionally, with PHASAGRAPH® we assessed the parameters of cardiointervalogram with automatic calculation of tension index (TI, u.). Before this,, in all groups the parameter of relative MOC was defined, mL/min/kg.

Results. Diagnostic efficacy of βT was assessed with AUC square under experimental ROC-curve. It was found, that in threshold βT0≈0,788 there is sensitivity SE =78,8% and specificity SP =80,3% By the results of measurement of STR, αQRS, σQRS in group of almost healthy volunteers the reference diapasons defined for these parameters, which were 110<αQRS<185 deg, σQRS<30 units, STR>0,02 units. The scheme invented for diagnostic conclusions with the use of collected βT , STR, αQRS and σQRS. It was found that “sizes” and direction of the motions of pairs in areas of phasic portrait bring the information on compensational-adaptational mechanisms in urgent, as in long-term adaptation.

Conclusion. Diagnostic ECG signs are more visible in the signal visualization in phasic coordinates z(t), z’(t), than in time zone z(t), and collection of phasic parameters of the phasic portrait, that are automatically calculated by the PHASAGRAPH® complex, make it to improve the power of one-channel ECG in prognostic reasons, as for the assessment of functional condition of cardiovascular system in screenings.

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