[Fatal nutrient deficiencies after gastric bypass]

Introduction: Bariatric surgery is a very effective treatment for obesity. After gastric bypass, micronutrient deficiencies frequently occur which can have dramatic consequences.

Case report: We report the case of a 55-year-old woman who was admitted for psychomotor retardation, bilateral leg pitting edema and psoriasis-like rash that had been ongoing for 3 months. Pancytopenia, encephalopathy and heart failure rapidly occurred leading to multiorgan dysfunction syndrome and death. We retrospectively identified severe selenium deficiency with possible secondary cardiomyopathy, niacin deficiency resulting in pellagrous encephalopathy with skin lesions and gelatinous transformation of bone marrow.

Conclusion: Micronutrient deficiency should systematically be assessed when new symptoms occur in a patient with a history of bariatric surgery. Selenium deficiency should be considered in the presence of any heart failure in this context.