A 57 year-old woman has palpitations, chest discomfort and tachycardia. The monitor shows a regular wide-complex QRS at a rate of 180.min. She becomes diaphoretic and BP is 80/60. The next action is to:
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Obtain 12 lead ECG
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Establish IV and give sedation for electrical cardioversion
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Perform immediate synchronized cardioversion
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Give amiodarone 300 mg IV push
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