A 36-year-old female patient complains of general weakness, edemata of her face and
hands, rapid fatiguability during walking, difficult diglutition, cardiac irregularities. These
symptoms turned up 11 days after a holiday at the seaside. Objectively: face erythema, edema of
shin muscles. Heart sounds are muffled, AP is 100/70 mm Hg. In blood: ASAT activity is 0,95
millimole/h·l, ALAT - 1,3 millimole/h·l, aldolase - 9,2 IU/l, creatine phosphokinase - 2,5
millimole Р/g·l. What method of study would be the most specific?
Select one of the following: