The patient was a 43-year-old man who was previously healthy. He suddenly manifested constricting left precordial pain and respiratory distress; he was therefore transported by ambulance to a hospital for an emergency examination. At that time, his blood pressure was 111/81 mmHg; pulse, 90 bpm; respiratory rate, 21 breaths/min; SpO2, 96% (no oxygen) and he was lucid. His heart and breathing sounds …