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A child with pica presents with abdominal pain and microcytic anemia. Which cellular mechanism explains lead toxicity?

A 22-year-old washes his hands 30 times daily despite skin irritation. He reports recognizing the behavior as excessive but cannot resist. Which mechanism best explains this?

A 54-year-old starts lisinopril and develops non-pitting facial and tongue swelling without urticaria or pruritus. Which mechanism best explains this angioedema?

In the United States, the most common infectious cause of viral meningitis in adolescents/young adults is:

A 54-year-old experiences sudden “worst headache of life” after exertion with nuchal rigidity. First-line diagnostic test?

A phlebotomist has high-risk percutaneous exposure to HIV from a known viremic patient. Which is the best next step?

A 59-year-old with painful, swollen great toe after a purine-heavy meal. Which finding best confirms the diagnosis?

A 76-year-old complains of hat no longer fitting, progressive hearing loss, and dull bone pain. Labs: markedly elevated ALP, normal calcium/phosphate. Skull radiograph shows “cotton-wool” appearance. Diagnosis?

If a patient arrives with braids or another style that prevent electrode placement, what is the correct action?

A patient arrives with hair full of styling gel, making electrode placement difficult. What should you do?