Periodic Paralysis: K Levels during Arrhythmia

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To the Editor: In their paper on "periodic paralysis with arrhythmia" Levitt and his colleagues1 attribute the attacks to hypokalemia. In the original description of the syndrome,2 Klein et al. regarded attacks as normokalemic, whereas we described a case with hyperkalemia.3 It seems unlikely that such a dramatic constellation should be due to three separate genetic disorders, and retrospective analysis of Klein's cases suggests that they, like ours, may have been hyperkalemic. It is therefore important to know more about the patient described by Levitt et al.During recovery from a spontaneous attack in their case, the serum potassium was . . .