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A 25-year-old woman presents with fever, dehydration, and HR…

A 25-year-old woman presents with fever, dehydration, and HR 128/min. ECG shows sinus tachycardia. Which underlying driver is most consistent with sinus tachycardia physiology?

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A 58-year-old with severe aortic stenosis develops exertiona…

A 58-year-old with severe aortic stenosis develops exertional syncope. Which mechanism most directly contributes to syncope during activity?  

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A hospitalized patient on bed rest develops unilateral leg s…

A hospitalized patient on bed rest develops unilateral leg swelling and pain. Which triad best explains the risk factors for this condition?

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A patient asks why pulse pressure widens with aging. The bes…

A patient asks why pulse pressure widens with aging. The best explanation is:  

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Which phase of the ventricular action potential is most resp…

Which phase of the ventricular action potential is most responsible for excitation–contraction coupling?

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A patient with acute leukemia develops dyspnea and confusion…

A patient with acute leukemia develops dyspnea and confusion with very high WBC count. Which complication is most likely?

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A patient with cirrhosis has generalized edema. Which Starli…

A patient with cirrhosis has generalized edema. Which Starling force change is most central?  

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A 68-year-old with long-standing hypertension presents with…

A 68-year-old with long-standing hypertension presents with abrupt, severe chest pain radiating to the back described as “tearing.” BP is 210/110. Which pathophysiologic event most likely explains the presentation?  

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A patient is diagnosed with lymphoma. Which finding most str…

A patient is diagnosed with lymphoma. Which finding most strongly supports Hodgkin lymphoma rather than non-Hodgkin lymphoma?  

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A patient stands up quickly and becomes lightheaded. Which i…

A patient stands up quickly and becomes lightheaded. Which immediate reflex response should occur in a healthy person?

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