A 41 y.o. patient complains of acute pain in the right side of the thorax and sudden progress of dyspnea following the lifting of a heavy object. The patient's condition is grave: lips and mucous membranes are cyanotic, BR- 28/min, Ps-122 bpm., AP- 80/40 mm Hg. There is tympanitis on percussion and weakened breathing on auscultaion on the right. S2 sound is accentuated above pulmonary artery. What is the main urgent measure on the prehospital stage?