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USMLE Questions and Answers (Q&A)

Which is the most appropriate treatment? A 44-year-old woman with an end-stage renal disease on hemodialysis presents to the physician with abdominal pain. Laboratory tests are positive for HBsAg,...
Chachelly
Answered: Apr 26, 2024
Lamivudine and interferon-α

The correct answer is A. This patient has recently acquired acute hepatitis B infection. Abdominal pain, positive hepatitis B surface antigen, and presence of...Read More

1 Answer

232 views
What is the underlying cause of this patient’s symptoms? A 32-year-old HIV-positive man with a recent CD4+ cell count of 84/mm³ and a 3-week history of worsening headaches is brought to the...
Chachelly
Answered: Apr 26, 2024
Mycobacterial meningitis

21. The correct answer is D. This patient suffered from tuberculous meningitis, which is demonstrated by the characteristic acid-fast bacilli present in the...Read More

1 Answer

230 views
In which region the venous sinuses are located?
John Smith
Answered: Apr 26, 2024
Dura mater -the dura mater (tough mother) contains the venous sinuses and is composed of dense connective tissue and possesses very limited osteogenic potential. the dura mater is one of the three...Read More

1 Answer

228 views
Which of the following mechanisms is most likely involved?
John Smith
Answered: Apr 26, 2024
Degeneration of the axon distal to the lesion-the correct answer is d. after transection of a nerve fiber, degeneration of nerve terminals begins almost immediately. wallerian degeneration (also...Read More

1 Answer

228 views
A 7-year-old girl is brought to the emergency department by her parents because of concerns that she is not growing and not developing appropriately. The parents say that the patient has cold...
Chachelly
Answered: Apr 26, 2024
Craniopharyngioma

10. The correct answer is A. Craniopharyngiomas account for 80%90% of neoplasms arising in the pituitary region and are the most common supratentorial tumor of childhood....Read More

1 Answer

228 views
What occurs in anaphylactic shock?
John Smith
Answered: Apr 26, 2024
Mast cells -mast cells and basophils are the key cells in the development of anaphylactic shock, a type of hypersensitivity reaction. in this allergic response, a person who has been sensitized to a...Read More

1 Answer

227 views
Which elevated ratio produced this patient’s hypoglycemia? A 54-year-old alcoholic is brought to the emergency department by fire rescue after being found lying face down in the street. He...
Chachelly
Answered: Apr 26, 2024
NADH:NAD+

The correct answer is B. This patient is suffering from hypoglycemia related to his alcohol use. Ethanol is metabolized to acetaldehyde, which is then metabolized to acetate...Read More

1 Answer

226 views
Which signs and symptoms commonly occur in patients with this disease? A 35-year-old woman comes to the physician with right-handed paralysis, ataxia, and difficulty urinating for the past 36...
Chachelly
Answered: Apr 26, 2024
Vision loss in one eye, usually lasting a few days

The correct answer is E. This patient most likely has multiple sclerosis, a CNS demyelinating disorder characterized by neurologic lesions...Read More

1 Answer

225 views
What is the most likely diagnosis? A 46-year-old man comes to the clinic with a cough that is occasionally productive of blood, diffuse muscle and joint pain in the upper extremities, and blood in...
Chachelly
Answered: Apr 26, 2024
Wegener’s granulomatosis

The correct answer is E. This patient has Wegeners granulomatosis, a disease characterized by necrotizing, granulomatous vasculitis affecting several organs, most...Read More

1 Answer

224 views
A 32-year-old HIV-positive man with a recent CD4+ cell count of 84/mm³ and a 3-week history of worsening headaches is brought to the emergency department by ambulance because of acute mental...
Chachelly
Answered: Apr 26, 2024
Mycobacterial meningitis

21. The correct answer is D. This patient suffered from tuberculous meningitis, which is demonstrated by the characteristic acid-fast bacilli present in the...Read More

1 Answer

223 views
What is true of the secondary response in comparison with the primary immune response?
John Smith
Answered: Apr 26, 2024
It is due to the presence of memory b and t cells -a secondary immune response is more rapid, of longer duration, and more intense than the primary immune response and involves memory cells. humoral...Read More

1 Answer

221 views
A 30-year-old woman with systemic lupus erythematosus treated with high-dose prednisone comes to her physician with symptoms of anemia. The patient’s blood studies show a low hemoglobin level...
Chachelly
Answered: Apr 26, 2024
Erythropoietin

9. The correct answer is A. This patients clinical presentation is consistent with anemia of chronic disease (ACD) in the setting of systemic lupus erythematosus. ACD...Read More

1 Answer

221 views
Which first-line drug prescribed for absence seizures most likely caused this result? A 2-year-old boy who started treatment for absence seizures 2 weeks ago presents to the physician with...
Chachelly
Answered: Apr 26, 2024
Ethosuximide

The correct answer is B. Ethosuximide is the only agent that is both used for absence seizures and associated with StevensJohnson syndrome. Ethosuximide is an antiepileptic...Read More

1 Answer

220 views
A 5-day-old normally developed boy presents to the emergency department with vomiting and constipation. The mother states that the child has not passed stool since birth but only recently began...
Chachelly
Answered: Apr 26, 2024
Neural crest

15. The correct answer is C. The disorder described in the question is Hirschsprungs disease, a disorder of neural crest cells. Specifically, neural crest cells fail to migrate...Read More

1 Answer

220 views
Which medications are the most likely cause of this patient’s symptoms and laboratory findings? A 32-year-old woman with a history of schizophrenia presents to the physician with amenorrhea and a...
Chachelly
Answered: Apr 26, 2024
Chlorpromazine

The correct answer is D. Chlorpromazine is an antipsychotic used in the treatment of schizophrenia and psychosis. Chlorpromazine blocks dopamine D2 receptors and thus blocks...Read More

1 Answer

219 views

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