A 67 y.o. patient complains of palpitation, dizziness, noise in ears, feeling of shortage of air. Objectively: pale, damp skin. Vesicular respiration, respiratory rate- 22 per min, pulse- 200 bpm, AP-100/70 mm Hg. On ECG: heart rate-200 bmp, ventricular complexes are wi- dened, deformed, location of segments ST and of wave T is discordant. The wave P is not changed, superimposes QRST, natural conformity between P and QRS is not present. What kind of arrhythmia is present?