A 56-year-old man complains of chest tightness, shortness of breath, and nausea. During your assessment, you note that he appears confused. He is profusely diaphoretic and has a blood pressure of 98/68 mm Hg and a rapid radial pulse. The cardiac monitor reveals a wide QRS complex tachycardia at a rate of 200 beats/min. After administering high-flow oxygen, you should:

A) attempt to slow his heart rate with vagal maneuvers and then start an IV line.
B) establish IV access, consider sedation, and perform synchronized cardioversion.
C) establish vascular access and administer 150 mg of amiodarone over 10 minutes.
D) obtain a 12-lead ECG tracing to determine the origin of his tachycardic rhythm.

Answer: B) establish IV access, consider sedation, and perform synchronized cardioversion.