How do you evaluate persistent resting sinus tachycardia (heart rate >100 bpm) in a hospitalized patient whose acute illness has otherwise stabilized?

This is a great question and something that we see rather frequently in the hospital.

2 guiding principles to frame this question:

• Sinus tachycardia (ST) is a symptom, not a diagnosis. It's a physiological response to an underlying condition. Which means we need to diagnose the condition, not focus on...