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Vitamins, derived from the Latin word for life, are essential organic substances required in small quantities for optimal growth and overall well-being. Unlike other organic nutrients, vitamins don't act as sources of energy or building materials but rather facilitate these nutrients' utilization by the body. Vitamins are predominantly coenzymes, assisting enzymes in specific chemical actions, like the oxidation of glucose for energy involving B vitamins. Most vitamins are not produced...
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Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure...
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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Not a Laughing Matter: When Nitrous Oxide Causes Functional Vitamin B12 Deficiency.

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|January 29, 2024
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Summary

Subacute combined degeneration (SCD) from nitrous oxide toxicity can cause progressive neurologic symptoms. Early diagnosis and treatment are crucial to prevent irreversible nerve damage in patients with vitamin B12 deficiency.

Keywords:
Nitrous oxide usefunctional cobalamin deficiencysubacute combined degeneration

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Area of Science:

  • Neurology
  • Toxicology
  • Nutritional Neuroscience

Background:

  • Subacute combined degeneration (SCD) is a neurologic complication linked to vitamin B12 deficiency.
  • It affects the dorsal and lateral spinal cord columns, leading to symptoms like paresthesias, ataxia, and weakness.
  • Delayed treatment can result in permanent nerve damage.

Purpose of the Study:

  • To present a case of SCD caused by nitrous oxide toxicity.
  • To emphasize the importance of considering SCD in patients with unexplained neurologic deficits.

Main Methods:

  • Case report of a young man with progressive neurologic symptoms.
  • Review of clinical presentation and potential causes.

Main Results:

  • The patient developed ascending paresthesias and lower extremity weakness.
  • Symptoms were associated with escalated nitrous oxide use.
  • This presentation mimicked typical vitamin B12 deficiency SCD.

Conclusions:

  • Nitrous oxide toxicity is a potential cause of subacute combined degeneration.
  • Clinicians should consider SCD in patients presenting with ataxia and weakness, especially with a history of nitrous oxide exposure.
  • Prompt recognition and management are vital for patient outcomes.