TITLE

Thyrotoxic Periodic Paralysis

AUTHOR(S)
Shih-Hua Lin
PUB. DATE
January 2005
SOURCE
Mayo Clinic Proceedings;Jan2005, Vol. 80 Issue 1, p99
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Thyrotoxic periodic paralysis (TPP), a hyperthyroidism-related hypokalemia and muscle-weakening condition resulting from a sudden shift of potassium into cells, has been seen increasingly in Western countries. Failure to recognize TPP may lead to improper management. Many patients with TPP have no obvious symptoms related to hyperthyroidism. Therefore, several important clues may help in diagnosing and managing TPP: presentation in an adult male with no family history of periodic paralysis; presence of systolic hypertension, tachycardia, high QRS voltage, first-degree atrioventricular block on electrocardiography; presence of lowamplitude electrical compound muscle action potential on electromyography and no notable changes in amplitudes after low doses of epinephrinine; and typical acid-base and electrolyte findings such as normal blood acid-base state, hypokalemia with low urinary potassium excretion, hypophosphatemia associated with hypophosphaturia, and hypercalcluria. Immediate therapy with potassium chloride supplementation may foster a rapid recovery of muscle strength, but with a risk of rebound hyperkalemia. Nonselective β-blockers may provide an alternative choice. Long-term therapy with definite control of hyperthyroidism completely abolishes attacks. Early diagnosis and prompt treatment of TPP prevent prevent life-threatening complications of this treatable and curable disorder.
ACCESSION #
15661495

 

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