Severe thiamine (vitamin B1) deficiency in a critically ill adult is a time-sensitive clinical presentation that requires a structured, protocol-driven approach distinct from milder deficiency states.
Adult patient with severe thiamine deficiency in a critical care setting. The acuity of this presentation places it in a distinct category requiring urgent, phased thiamine repletion rather than routine oral supplementation.
At this severity level, management involves a structured thiamine replacement protocol delivered in phases. The specific administration pathway and subsequent steps are defined in the full protocol.
Dramatic response to treatment with symptomatic relief within hours is the expected outcome in adults with cardiac insufficiency.
In severe deficiency states the following dosages are recommended:
50–100 mg thiamine should be administered very slowly intravenously, followed by the same oral doses as for infants.
Followed by a daily intramuscular dose of 10 mg for about a week.
This should then be followed by 3-5 mg of thiamine per day orally for at least 6 weeks.
In infants with thiamine deficiency and in adults with cardiac insufficiency the response to treatment is dramatic, with symptomatic relief within hours, whereas deficiency states with peripheral neuritis show a less spectacular improvement.
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