FIELD: medicine. SUBSTANCE: method involves transvenously introducing endomyocardial catheter-electrode having biotome mounted on its working end into a zone to be examined and taking tissue sample. Controllable endomyocardial catheter-electrode and biotome are designed as cylinder with two diametrically opposite spiral narrow crescent-shaped fastening members. The device is introduced into heart tissues by rotating it about its axis under electrographic control until its amplitude increases by 70-120% when compared to its initial size and changes curve shape from biophase- to monophase-specific. Tissue samples are taken by expanding catheter-electrode. EFFECT: enabled tissue sampling from any heart regions including right cardiac chambers. 2 dwg
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