16. After having a fight, a young man presented to the trauma center with a lacerated wound in the right chest. Patient was in severe respiratory distress. Examination showed there was tachycardia and tachypnea. Moreover, breath sounds were absent in right chest. Chest x-ray showed mediastinal shift to left. What is the most likely diagnosis?
17. A patient presented to medical OPD with all the signs and symptoms of heart failure. His echocardiography showed increased right ventricle workload, right ventricle hypertrophy, displaced interventricular septum and tricuspid regurgitation. What is the most important test to confirm the diagnosis in this regard?