A 55-year-old man with a history of hypertension presents to your ED complaining of generalized, progressive weakness and shortness of breath over the past 2 days. His medications include amlodipine and enalapril. His blood pressure is 142/68 mm Hg, and respiratory rate of 20 breaths per minute with a pulse oximetry of 97% on room air. His cardiac and pulmonary examination is unremarkable. An ECG is performed as seen below.
2. What is the first medication that should be administered to treat this problem?
3. List the progressive ECG changes seen with this condition?
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