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A monitored pt. in the ICU developed a sudden onset of narrow complex tach at a rate of 220/min. The pt's BP is 128/58,

A monitored pt. in the ICU developed a sudden onset of narrow complex tach at a rate of 220/min. The pt's BP is 128/58, the PETCO2 is 38mm Hg, and the O2 sat is 98%. There is an EJ established for vascular access. The pt. denies taking any vasodialators. A 12 lead shows no ischemia or infarction. Vagal maneuvers are ineffective. What is the next intervention?

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