<prompt> A patient ingested some unknown substance and presented with myoclonic jerks, seizures, tachycardia and hypotension. ECG shows a heart rate of 120min. The arterial blood revealed a pH of 7.25, pCO2 of 30 mm Hg and bicarbonate ions are 15 mmolL. The most likely poisonous agent is:Amanita phylloidsEthylene glycolImipraminePhencyclidine  <response>: Ans. C ImipramineRef: KDT 8e p486, 487Features are typical of tricyclic antidepressant poisoning. TCAs possess anticholinergic activity that can result in tachycardia. These agents can lead to metabolic acidosis pH 7 4, HCO3- 24 mmolL. Seizures and myoclonic jerks are other features of TCA poisoning. 