A monitored patient in the ICU developed a sudden onset of narrow-complex tachycardia at a rate of 220/min. The patient's blood pressure is 128/58 mm Hg, the PETCO₂ is 38 mm Hg, and the pulse oximetry reading is 98. What is the most appropriate intervention in this situation? 1) Administer amiodarone 300 mg IV push 2) Administer adenosine 6 mg IV push 3) Perform synchronized cardioversion at 200 J 4) Perform synchronized cardioversion at 50 J
