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As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...
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Thyrotoxic Hypokalemic Periodic Paralysis.

Satyendra Kumar Sonkar1, Satish Kumar1, Neeraj Kumar Singh1

  • 1Department of Medicine, KGMU, Lucknow, Uttar Pradesh, India.

Indian Journal of Critical Care Medicine : Peer-Reviewed, Official Publication of Indian Society of Critical Care Medicine
|June 19, 2018
PubMed
Summary

This case study highlights thyrotoxic hypokalemic periodic paralysis, a severe condition linked to hyperthyroidism. Prompt treatment with potassium chloride and antithyroid drugs effectively resolved symptoms.

Keywords:
Hyperthyroidismhypokalemiaquadriparesis

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Area of Science:

  • Endocrinology
  • Internal Medicine
  • Clinical Case Study

Background:

  • Hyperthyroidism is an endocrine disorder characterized by excessive thyroid hormone production.
  • Hypokalemia, or low potassium levels, is a critical condition that can lead to severe neuromuscular and cardiac complications.
  • Thyrotoxic hypokalemic periodic paralysis (THPP) is a rare but serious complication of hyperthyroidism.

Observation:

  • A 45-year-old male with known hyperthyroidism presented with acute quadriparesis, tremor, irritability, and respiratory distress.
  • Initial assessment revealed severe hypokalemia via arterial blood gas analysis.
  • The patient's condition was stabilized with oxygen and intravenous potassium chloride administration.

Findings:

  • Thyroid function tests confirmed hyperthyroidism with elevated free tri-iodothyronine (FT3) and free thyroxine (FT4), and suppressed thyroid-stimulating hormone (TSH).
  • The clinical presentation and laboratory findings were consistent with thyrotoxic hypokalemic periodic paralysis.
  • Treatment with carbimazole, an antithyroid medication, led to significant symptom improvement during follow-up.

Implications:

  • This case underscores the importance of recognizing THPP in patients with hyperthyroidism presenting with hypokalemic paralysis.
  • Early diagnosis and management, including potassium repletion and control of thyroid hormone levels, are crucial for patient recovery.
  • Understanding the mechanism involving increased Na+/K+-ATPase activity driven by thyroid hormones is key to managing this condition.