A 41-year-old office worker presents with localized shoulder pain that worsens with movement. Imaging later reveals inflammation of the small fluid-filled sacs that reduce friction between tendons and bone. Which condition BEST explains this finding?

An ECG strip shows regular P waves that are not consistently followed by QRS complexes, with a fixed PR interval in conducted beats. Which rhythm does this MOST accurately represent?

Which presentation MOST strongly indicates a hypertensive emergency with end-organ damage?

A 40-year-old man was shot in the face with a shotgun. He is conscious, sitting upright in a chair. There is massive soft-tissue damage to his face; his mandible is gone and his upper airway structures are exposed. His oxygen saturation is 95% and his respiratory rate is 22 breaths/min. What should you do?

While preparing to initiate transcutaneous pacing for a profoundly bradycardic patient, which issue MOST commonly interferes with successful pacing in the field?