Cholinergic/Adrenergic drugs Practice Questions

Q: A mother reports that her daughter ingested a substance in an unknown dose. The girl presents with hypertension, tachycardia, mydriasis, and hyperthermia. What is the most likely substance?

Cocaine. ***Cocaine*** - The presented symptoms of **hypertension, tachycardia, mydriasis, and hyperthermia** are characteristic of a **sympathomimetic toxidrome**, frequently caused by cocaine overdose. - Cocaine acts as a **norepinephrine-dopamine-serotonin reuptake inhibitor**, leading to excessive stimulation of the central and peripheral nervous systems. *Heroin* - Heroin is an **opioid**, and overdose generally presents with **respiratory depression, bradycardia, miosis (pinpoint pupils)**, and hypotension, which are contrary to the patient's symptoms. - Patients typically exhibit central nervous system **depression**, rather than the hyperactive state seen here. *Morphine* - Similar to heroin, morphine is an **opioid** and causes symptoms like **respiratory depression, bradycardia, miosis**, and hypotension. - These effects are the opposite of the **sympathomimetic** signs observed in the patient. *Chlorpheniramine* - Chlorpheniramine is an **antihistamine** with significant **anticholinergic effects**. An overdose might cause **mydriasis and tachycardia**, but not typically severe hypertension or hyperthermia as the primary features. - Other anticholinergic signs such as **dry mucous membranes, urinary retention, and altered mental status (delirium)** would also be expected. *Organophosphate* - Organophosphate poisoning causes a **cholinergic toxidrome** due to **acetylcholinesterase inhibition**, resulting in excessive cholinergic stimulation. - Classic presentation includes **SLUDGE syndrome** (Salivation, Lacrimation, Urination, Defecation, GI upset, Emesis) along with **miosis (pinpoint pupils), bradycardia, bronchospasm**, and muscle fasciculations. - These findings are the **opposite** of the sympathomimetic signs seen in this patient.

Q: A 45-year-old patient with a history of depression was initially being treated with sertraline, but his symptoms were not adequately controlled. His medication regimen was changed to include an MAO inhibitor and amitriptyline. Shortly after the change in medication, the patient developed agitation, seizures, hyperreflexia, and tremor. Which of the following is the most appropriate treatment for this patient?

Cyproheptadine. ***Cyproheptadine*** - This patient exhibits symptoms of **serotonin syndrome** (agitation, seizures, hyperreflexia, tremor) due to the combination of an **MAO inhibitor** and **amitriptyline**. - **Cyproheptadine** is a **serotonin antagonist** and is the most appropriate treatment for reversing the effects of serotonin syndrome. - Treatment also includes discontinuing offending agents and supportive care. *Lorazepam* - **Lorazepam** is a **benzodiazepine** that can help manage agitation and seizures, but it does not address the underlying serotonin overstimulation. - It would be used as an adjunct for symptom control, not as the primary treatment for serotonin syndrome. *Dantrolene* - **Dantrolene** is a **muscle relaxant** used for **neuroleptic malignant syndrome (NMS)** and **malignant hyperthermia**. - While NMS and serotonin syndrome can have overlapping features (hyperthermia, rigidity), dantrolene is not indicated for serotonin syndrome. - Cyproheptadine is the specific serotonin antagonist needed for this condition. *L-carnitine* - **L-carnitine** is a supplement often used for conditions like **carnitine deficiency** or certain **metabolic disorders**. - It has no role in the treatment of serotonin syndrome. *Leucovorin* - **Leucovorin** (folinic acid) is used to **rescue bone marrow** from the toxic effects of **methotrexate** or to enhance the effects of **fluorouracil**. - It is not indicated for the treatment of serotonin syndrome.

Question 1

A 45-year-old man with a renal transplant performed 18 months ago has been maintained on tacrolimus, mycophenolate mofetil, and prednisone. He now presents with a three-week history of progressive dyspnea and non-productive cough. Chest radiograph shows bilateral perihilar interstitial infiltrates. Bronchoalveolar lavage reveals disc-shaped organisms with a characteristic morphology on Grocott-Gomori methenamine silver stain. The infectious disease team recommends trimethoprim-sulfamethoxazole as first-line therapy. Which of the following best describes the key host defense that is impaired in this patient, making him susceptible to this infection?

Accepted Answer

Calcineurin inhibition by tacrolimus impairs IL-2-dependent CD4+ T-cell activation required for clearance

Answer

Mycophenolate mofetil depletes neutrophils, eliminating the primary phagocytic defense against this organism

Answer

Prednisone directly upregulates the organism's cyst wall synthesis, promoting virulence

Answer

Tacrolimus inhibits mTOR signaling, preventing macrophage autophagy of intracellular organisms

Answer

Mycophenolate mofetil inhibits inosine monophosphate dehydrogenase, reducing NK cell cytotoxicity against this pathogen

Question 2

A chronic smoker wants to quit smoking. Which of the following is the MOST appropriate first-line pharmacotherapy for smoking cessation?

Accepted Answer

Varenicline

Answer

Mirtazapine

Answer

Bupropion

Answer

Nicotine replacement therapy

Answer

Clonidine

Question 3

A mother reports that her daughter ingested a substance in an unknown dose. The girl presents with hypertension, tachycardia, mydriasis, and hyperthermia. What is the most likely substance?

Accepted Answer

Cocaine

Answer

Heroin

Answer

Morphine

Answer

Chlorpheniramine

Answer

Organophosphate

Question 4

A 30-year-old drug addict presents to the emergency department with signs of unknown drug poisoning. The patient exhibits dilated pupils, diaphoresis, tachycardia, and tremors. On examination, the blood pressure is 180/110 mmHg, and the heart rate is 120 beats per minute. What is the most likely diagnosis?

Accepted Answer

Cocaine intoxication

Answer

Dhatura poisoning

Answer

Cannabis poisoning

Answer

Alcohol intoxication

Answer

Amphetamine intoxication

Question 5

A 45-year-old patient with a history of depression was initially being treated with sertraline, but his symptoms were not adequately controlled. His medication regimen was changed to include an MAO inhibitor and amitriptyline. Shortly after the change in medication, the patient developed agitation, seizures, hyperreflexia, and tremor. Which of the following is the most appropriate treatment for this patient?

Accepted Answer

Cyproheptadine

Answer

Lorazepam

Answer

L-carnitine

Answer

Leucovorin

Answer

Dantrolene

Cholinergic/Adrenergic drugs — MCQs

Cholinergic/Adrenergic drugs — MCQs

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