JOURNAL ARTICLE

Calcium effect on generation and amplification of myokymic discharges

J F Brick, L Gutmann, C F McComas
Neurology 1982, 32 (6): 618-22
6283421
Maneuvers designed to manipulate ionized calcium (Ca++) were carried out in two patients with inflammatory polyradiculoneuropathy and myokymia. Increased clinical myokymia and myokymic burst amplification occurred when ionized Ca++ was lowered by plasma exchange or hyperventilation. Increasing ionized Ca++ (by intravenous infusion of CaCl2) decreased the myokymia. These findings indicate that myokymic discharges are altered by changes in serum ionized Ca++ and effects on axonal excitability.

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