When assessing an anxious patient who presents with tachycardia, you must:

A) obtain a 12-lead ECG tracing before initiating any treatment.
B) determine if the tachycardia is causing hemodynamic instability.
C) prepare for cardioversion if the rate is less than 150 beats/min.
D) administer diazepam or midazolam to facilitate your assessment.

Answer: B) determine if the tachycardia is causing hemodynamic instability.