Periodic Paralysis of the Hypokalemic Type in a Patient with Thyrotoxicosis

Image 1

A 30 yo with no significant medical hx c/o of lower extremity weakness.

The ecg shows sinus rhythm (~70 bpm), ST depression and prolonged QTc (~530 ms).

Work-up revealed low K (1.8), low TSH and elevated FT4. K was replaced and the weakness improved and was started on antithyroid medication and beta-blocker and discharged after a few days.

After correction of potassium, T wave looked normal and QT improved.

Image 2

ECG Interpretation: Hypokalemia
Case: Periodic paralysis of the hypokalemic type in a pt with thyrotoxicosis.

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