A 45-year-old man was brought to clinic with complaints of a sudden pain in the left chest part and epigastric area, shortness of breath, nausea, one-time vomiting. The acute pain started after considerable weight lifting. On physical examination: shallow breathing, RR - 38/min, left chest part is getting behind during respiration, by percussion - tympanitic sound, respiration is not auscultated. Ps - 110 bpm, of weak filling. BP - 100/60 mm Hg, insignificant displacement of heart to the right, sounds are dull. What examination is the most expedient?