ST-Elevation on the ECG in a 36 year old man (Presented at ESC Congress 2019)

The patient was a 36-year-old man who was previously healthy. He suddenly manifested squeezing left parasternal chest pain. The pain started seventeen hour before the visit. At that time, his blood pressure was 140/81 mmHg; pulse, 70 beat per minute; respiratory rate, 20 breaths/min and his oxygen saturation was 96% in room air. On electrocardiography (Figure 1), voltage was extremely low in the precordial leads, particularly in V4, V5 and V6 leads, and ST-segment elevations in V1, V2, V3, V4, II, III and aVF leads. A plain chest radiograph demonstrated a large, left-sided pneumothorax, with the collapse of nearly whole left lung area and his heart was deviated to the right side, with more than two thirds of the heart on the right side of the midline.

What test was done after chest tube placement and what were the findings ?