A scuba diver presents with joint pain and dizziness after a rapid ascent. What is the likely cause of this condition?

A 12-year-old girl presents with involuntary repetitive handwashing and constant fear of contamination. She is aware the behavior is excessive. What is the most likely diagnosis?

A 55-year-old male presents with hemoptysis, weight loss, and a mass in the lung apex. What syndrome is most commonly associated with a lung tumor in this location?

A 66-year-old male presents with melena and fatigue. His hemoglobin is 8.2 g/dL. Endoscopy reveals a bleeding gastric ulcer. What lab value would you expect to be decreased?

A 48-year-old man presents with jaundice, elevated liver enzymes, and a history of intravenous drug use. Which viral hepatitis is most likely responsible for his chronic liver disease?

A 19-year-old female with asthma presents with worsening wheezing and shortness of breath. What long-term physiologic change contributes to persistent symptoms if uncontrolled?

A 25-year-old male has polyuria, polydipsia, and dehydration. Serum sodium is high, and urine osmolality is low. What is the most likely diagnosis?

A 44-year-old woman with hypertension is noted to have left ventricular hypertrophy on echocardiogram. What is the most likely pathophysiologic mechanism?

A 62-year-old man experiences sudden cardiac arrest. CPR is initiated. What rhythm is most likely to respond to defibrillation?

A 70-year-old man presents with new-onset back pain and anemia. Labs show elevated serum calcium and creatinine. Serum protein electrophoresis shows an M spike. What is the diagnosis?