Rate of acute respiratory failure requiring mechanical ventilation due to hypercholinergic syndrome: 32.2%, total dose of atropine: 18.5 ± 28.6 mg. Subclinical features: median cholinesterase activity: 152.0 ± 1443 U / l, in which cholinesterase activity was severely reduced: 93.5%, increased white blood cell count 87.1%, hypokalemia: 58.0%, increased amylase: 38.8%.