Practice questions › Davidson's Principles of Medicine › Davidson's Medicine - Part 2: Emergency and Critical Care
10 Poisoning MCQs
Davidson's Medicine - Part 2: Emergency and Critical Care · Davidson's Principles of Medicine · 12 practice questions
- Organophosphates
- Cardiovascular and lithium poisoning
- Alcohols and glycols
- Chemical agents
- Environmental poisoning
- Antidepressants
- Decontamination
- Antidotes
1. A patient after LSD ingestion has a psychotic reaction, and another has taken ketamine long term with frequency and haematuria. Which statements are correct?
- AUse restraint; ketamine causes prostatitis
- BUse haloperidol first; ketamine causes nephritis
- CGive no sedation; ketamine causes cystitis only in women
- DUse a benzodiazepine avoiding antipsychotics if possible; chronic ketamine causes severe cystitis
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D. Use a benzodiazepine avoiding antipsychotics if possible; chronic ketamine causes severe cystitis Antipsychotics may precipitate cardiovascular collapse or convulsions; ketamine and methoxetamine cause severe chronic cystitis.
2. A patient with a tricyclic overdose has a QRS of 0.18 s, and another has taken venlafaxine. Which statements are correct?
- ANarrow QRS predicts arrhythmia; SNRIs cause bradycardia
- BQT is irrelevant; SSRIs cause hypoglycaemia
- CQRS over 0.16 s indicates severe sodium channel blockade with arrhythmia risk; SNRIs are more toxic than SSRIs with QRS and QT prolongation
- DQRS over 0.16 is benign; SNRIs are safer than SSRIs
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C. QRS over 0.16 s indicates severe sodium channel blockade with arrhythmia risk; SNRIs are more toxic than SSRIs with QRS and QT prolongation TCA toxicity monitors QRS; venlafaxine and duloxetine are more toxic than SSRIs with hypoglycaemia possible.
3. One patient has visual blurring, headache and a raised osmolar gap, while another has flank pain, hypocalcaemia and acute tubular necrosis after ingesting antifreeze-type products. Which diagnoses and antidote fit?
- AEthylene glycol, and methanol, treated with naloxone
- BMethanol, and paracetamol, treated with atropine
- CMethanol with optic disc oedema, and ethylene glycol with calcium oxalate precipitation, both treated with fomepizole
- DIsopropanol, and ethanol, treated with acetylcysteine
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C. Methanol with optic disc oedema, and ethylene glycol with calcium oxalate precipitation, both treated with fomepizole Methanol affects vision; ethylene glycol causes renal calcium oxalate precipitation and ATN; fomepizole is the antidote for both.
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