A 42 y.o. patient lifted a heavy object that resulted in acute pain in the right half of his chest, increased dyspnea. The patient's condition is grave: cyanosis of lips and mucous membranes, RR is 28 pm, Ps-122 bpm. On percussion there is tympanitis above the right half of chest, on auscultation - stongly diminished breath sounds; accent of the II heart sound above the pulmonary artery. AP is 80/40 mm Hg. What is the main emergency action at the pre-admission stage?