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The ECG above was obtained from a 24-year-old man with episodes of marked periodic weakness. He was otherwise healthy. What does the ECG suggest as a contributing cause of his symptoms? What disorder might the patient have?

ECG Review: Periodic Weakness?

The ECG above was obtained from a 24-year-old man with episodes of marked periodic weakness. He was otherwise healthy. What does the ECG suggest as a contributing cause of his symptoms? What disorder might the patient have?