Assess thiamine (vitamin B1) deficiency risk. High-risk groups: chronic alcoholism (most common), prolonged inadequate nutrition or starvation above 2 weeks, malabsorption syndromes (Crohn disease, celiac), bariatric surgery (especially Roux-en-Y), persistent vomiting (hyperemesis gravidarum), and refeeding syndrome. Thiamine supplementation should precede glucose/carbohydrate administration in all high-risk patients.
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