A 46-year-old female patient complaining of having alveolar hemorrhage for 6 hours after a tooth extraction, general weakness and dizziness was delivered to a hospital. The patient has a history of essential hypertension. Objectively: pale skin and mucous membranes. In blood: Hb - 80 g/l, Ht - 30%, bleeding and coagullation time is normal. What complication had been provoked by the hemorrhage?