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Infants with vitamin B12 deficiency can develop involuntary movements. These movements may appear during or before supplementation and typically resolve with clonazepam therapy, highlighting the importance of diagnosing cobalamin deficiency.

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Area of Science:

  • Pediatric Neurology
  • Nutritional Neuroscience
  • Developmental Pediatrics

Background:

  • Nutritional vitamin B12 (cobalamin) deficiency is a known cause of neurologic problems in infants.
  • Key neurologic consequences include developmental delays, regression, and involuntary movements.

Purpose of the Study:

  • To investigate the characteristics of involuntary movements in infants with cobalamin deficiency.
  • To compare the onset of involuntary movements relative to vitamin B12 supplementation.

Main Methods:

  • Retrospective review of medical records of infants diagnosed with cobalamin deficiency.
  • Categorization of infants with involuntary movements into two groups: those developing movements during supplementation (Group I) and those prior to supplementation (Group II).

Main Results:

  • Out of 32 infants with cobalamin deficiency, 12 exhibited involuntary movements.
  • Group I (n=6) and Group II (n=6) showed distinct movement patterns, with Group II predominantly displaying choreoathetoid movements, twitching, myoclonus, and tremor.
  • Involuntary movements in both groups resolved within 1-3 weeks with clonazepam therapy.

Conclusions:

  • Early recognition of nutritional cobalamin deficiency is crucial for accurate differential diagnosis of involuntary movements in infants.
  • Distinguishing cobalamin deficiency from seizures or other causes prevents unnecessary aggressive treatments.