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Fatal Microvascular Pulmonary Emboli From Precipitation of a Total Nutrient Admixture Solution

Department of Surgery, Tripler Army Medical Center, Honolulu, Hawaii

Leslie S. Heldman, MD

Department of Pathology, Tripler Army Medical Center, Honolulu, Hawaii

Elwin D.H. Goo, PHARMD

Department of Pharmacy, Tripler Army Medical Center, Honolulu, Hawaii

Paul E. Whippo, DVM

Department of Clinical Investigation, Tripler Army Medical Center, Honolulu, Hawaii

Joseph C. Perkinson, MD

Department of Surgery, Tripler Army Medical Center, Honolulu, Hawaii

Background: Paroxysmal respiratory failure and death occurred in two young adult females with pelvic infections. Autopsy revealed an amorphous material containing calcium obstructing the pulmonary microvasculature of each patient. Both patients received an identical total nutrient admixture (TNA) solution before their deaths. Methods: Infusion of TNA into an animal model was undertaken in an effort to reproduce the clinical effect. Laboratory investigation was also performed to isolate a precipitate and identify the factors contributing to precipitation. Results: A nonvisible precipitate containing calcium, phosphorus, and organic material was isolated from the TNA solution. Infusion of the formulation into healthy pigs resulted in sudden death within 4 hours. Alteration of the amino acid component, mix sequence, agitation technique, and mixing container influenced precipitate formation. Conclusion: Pulmonary embolization of a precipitate containing calcium phosphate resulted in the death of two patients. The pH of the amino acid component, transient elevation of calcium and phosphorus concentrations during mixing, and the lack of agitation during automated preparation of the formulation were identified as the etiologic factors producing the fatal precipitate. (Journal of Parenteral and Enteral Nutrition 20:81-87, 1996)

Journal of Parenteral and Enteral Nutrition, Vol. 20, No. 1, 81-87 (1996)
DOI: 10.1177/014860719602000181


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