Drug Poisoning and Antidotes

A 35-year-old man with a history of tuberculosis is found unconscious with a respiratory rate of 6 breaths per minute and pinpoint pupils. He is suspected to have taken an overdose of morphine. Which is the drug of choice for immediate reversal of opioid toxicity?

Which of the following antidotes acts by forming a stable chelate complex with heavy metal ions, making it the drug of choice for lead poisoning?

A 28-year-old woman is brought to the emergency department 2 hours after ingesting an unknown number of organophosphate pesticide tablets during a suicide attempt. She presents with excessive salivation, miosis, muscle fasciculations, and respiratory distress. Which is the drug of choice for immediate management of organophosphate poisoning?

A 28-year-old male farmer is brought to the hospital 30 minutes after accidental exposure to an organophosphate pesticide. He presents with profuse salivation, lacrimation, urination, defecation, muscle fasciculations, and pinpoint pupils. Which investigation is most specific for confirming organophosphate poisoning and guiding the dose of pralidoxime?

A 32-year-old woman is brought to the emergency department 6 hours after ingesting an unknown pesticide. She presents with pinpoint pupils, excessive salivation, muscle fasciculations, and respiratory distress requiring intubation. Her serum cholinesterase is 15% of normal. Which finding would best help differentiate this as organophosphate rather than carbamate poisoning at this stage?