Free Questions and Answers for All Medical Students all over the World
Q- A drug that increases GABA activity in the central nervous system is prescribed for anxiety. Which class of drugs acts by increasing the frequency of chloride channel opening at the GABA-A receptor? A- Barbiturates B- Benzodiazepines C- Selective serotonin reuptake inhibitors D- Tricyclic antidepressants Q- A woman has heavy menstrual bleeding and prolonged … Read more
Q- A 59-year-old man presents with crushing chest pain for 1 hour. ECG shows ST elevation in the anterior leads. The hospital does not have a catheterization laboratory, and transfer would take 3 hours. What is the most appropriate next step? A- Administer fibrinolytic therapy B- Begin aspirin therapy only C- Start intravenous heparin and … Read more
Q- A patient with atrial fibrillation is treated with dofetilide. Which electrophysiologic effect explains the antiarrhythmic action of this drug? A- Decreased phase 0 depolarization B- Increased refractory period by potassium channel blockade C- Inhibition of calcium influx in AV node D- Sodium channel blockade during depolarization Q- A patient treated with acetazolamide develops … Read more
Q- A 64-year-old man with a long history of smoking presents with hematuria. Cystoscopy reveals a papillary tumor arising from the bladder mucosa. Which molecular alteration is most commonly associated with low-grade papillary urothelial carcinoma? A- KRAS mutation B- FGFR3 mutation C- BRAF mutation D- APC mutation Q- A 14-year-old boy presents with a … Read more
Q- A 28-year-old woman presents with palpitations and tremor. ECG shows atrial fibrillation. Labs reveal suppressed TSH and elevated T4. What is the most appropriate initial treatment? A- Methimazole B- Propranolol C- Radioactive iodine therapy D- Thyroidectomy Q- A 35-year-old man presents with fever, hypotension, and a diffuse rash after a minor surgical procedure. … Read more
Q- A patient with Parkinson’s disease is treated with selegiline. What is the primary mechanism of this drug? A- Inhibition of catechol-O-methyltransferase B- Inhibition of monoamine oxidase B C- Stimulation of dopamine receptors D- Stimulation of muscarinic receptors Q- A patient treated with verapamil develops constipation and bradycardia. What class of drug does verapamil … Read more