Question 1

What is the first step in managing a poisoning case?

Accepted Answer

The first step is immediate exposure cessation to prevent further toxin entry. This is followed by thorough decontamination, including skin and eye washing to remove external poison residue. These initial actions are critical before proceeding to gastrointestinal decontamination or absorption management strategies.

Question 2

How does activated charcoal work in treating poisoning?

Accepted Answer

Activated charcoal works through adsorption, binding toxins to its surface carbon moieties to prevent absorption into the bloodstream. Its large internal pore structure provides extensive surface area for toxin binding. It is effective in most acute drug overdoses and is typically administered at 0.5–2 grams per kilogram of body weight.

Question 3

What are the main gastrointestinal decontamination methods used in poisoning treatment?

Accepted Answer

Three primary methods are adsorption using activated charcoal, whole-bowel irrigation with polyethylene glycol solution to purge intestines, and gastric lavage using a tube to flush stomach contents with saline. Each method has specific applications and contraindications depending on the poison type and patient condition.

Question 4

What happens when a poison has already been absorbed into the bloodstream?

Accepted Answer

Once absorbed, elimination enhancement procedures are employed. These include urine alkalinization using sodium bicarbonate to expedite weakly acidic drug elimination, antidotal therapy with specific antagonists, and hemodialysis to remove toxic metabolites from blood. These methods accelerate toxin removal from the body.

Question 5

How does urine alkalinization help eliminate certain poisons?

Accepted Answer

Urine alkalinization involves infusing sodium bicarbonate to make urine more alkaline, which traps weakly acidic poisons in the urine for excretion. This method increases renal elimination of toxins like salicylates by altering urinary pH, preventing reabsorption in the renal tubules.

Question 6

What are antidotal therapies and how do they work?

Accepted Answer

Antidotal therapy employs specific antagonists that counteract poison effects through various mechanisms. N-acetyl-L-cysteine reverses acetaminophen poisoning, while naloxone counteracts heroin overdose. These agents work by competing for receptor sites or altering drug metabolism to neutralize toxic dynamics.

Question 7

When is hemodialysis used in poisoning treatment?

Accepted Answer

Hemodialysis removes waste and toxic metabolites from blood and is indicated for severe or life-threatening poisonings. It is most effective for water-soluble, low molecular weight toxins with minimal protein binding when other elimination methods are ineffective or contraindicated.

التسمم الدوائي: استراتيجيات العلاج

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