Symptoms: (single dose less than 150 mg / kg - acute poisoning is considered light, 150-300 mg / kg - moderate,more than 300 mg / kg - severe): salicylism syndrome (nausea, vomiting, tinnitus, visual impairment, dizziness, severe headache, general malaise, fever - poor prognostic sign in adults).
Severe poisoning - hyperventilation of the lungs of the central genesis, respiratory alkalosis, metabolic acidosis, confused consciousness, drowsiness, collapse, convulsions, anuria, bleeding. Initially, central hyperventilation of the lungs leads to respiratory alkalosis - dyspnea, choking, cyanosis, cold sticky sweat; with increasing intoxication, paralysis of respiration and dissociation of oxidative phosphorylation, causing respiratory acidosis, increase.
In chronic overdose, the concentration in the plasma is poorly correlated with the severity of intoxication. The greatest risk of developing chronic intoxication is observed in the elderly with more than 100 mg / kg / day for several days. In children and elderly patients, the initial signs of salicylism are not always noticeable, so it is advisable to periodically determine the salicylate content in the blood: a concentration above 70 mg% indicates moderate or severe poisoning; above 100 mg% - about extremely severe, prognostically unfavorable.With moderate and severe poisoning, hospitalization is necessary.
Treatment: provocation of vomiting, the appointment of activated carbon and laxatives, constant monitoring of the acid-base state and electrolyte balance; depending on the state of metabolism - the introduction of sodium bicarbonate, sodium citrate solution or sodium lactate. The increase in reserve alkalinity increases the excretion of acetylsalicylic acid due to alkalinization of urine. Urinary alkalization shown at concentrations of salicylates higher than 40% and is provided mg intravenous infusion of sodium hydrogencarbonate (88 mEq in 1 L of 5% dextrose solution at a rate of 10- 15 ml / h / kg); restoration of circulating blood volume and diuresis induction is achieved by introducing sodium hydrogen carbonate at the same doses and dilution, which is repeated 2-3 times. Caution should be exercised in elderly patients in whom intensive fluid infusion can lead to pulmonary edema. It is not recommended the use of acetazolamide for alkalinization of urine (can cause acidosis and enhance the toxic effect of salicylates). Hemodialysis is indicated in salicylate concentration of 100-130 mg% in patients with chronic poisoning - 40 mg% or below in the presence of indications (refractory acidosis, progressive, deterioration, severe central nervous system damage, pulmonary edema and renal failure). When swelling of the lungs - artificial ventilation of the lungs with a mixture enriched with oxygen.