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No Evidence of Transfusion-Transmission of Neurodegenerative Disorders

July 6, 2016

Alzheimers disease, illustration

Misfolded proteins aggregate in the brain in many neurodegenerative disorders, and animal studies have shown that protein misfolding can be induced. A recent retrospective cohort study examined close to 1.5 million patients who received transfusions in Sweden and Denmark between 1968 and 2012.  Approximately 3% of these patients received one or more transfusions from a donor with a neurodegenerative disorder including any type of dementia (1.8%), Parkinson disease (1.0%), Alzheimer disease (0.8%), and amyotrophic lateral sclerosis (ALS, 0.3%).  There was no evidence of transfusion-transmission of neurodegenerative disorders.  The hazard ratio (HR) for dementia in transfusion recipients from donors with dementia versus donors without dementia was 1.04 (95% CI, 0.99 to 1.09).   Similar hazard ratios were estimated for Alzheimer disease (HR, 0.99; [95% CI, 0.85-1.15]) and Parkinson disease (HR, 0.94; [95% CI, 0.78-1.14]).  The study was underpowered to draw any conclusions about ALS (n=7).  Results of the study are reassuring for transfusion recipients.

Reference:

  1. Edgren G, Hjalgrim H, Rostgaard K, Lambert P, Wikman A, Norda R, Titlestad KE, Erikstrup C, Ullum H, Melbye M, Busch MP, Nyren O. Transmission of Neurodegenerative Disorders Through Blood Transfusion: A Cohort Study. Annals of internal medicine. 2016. doi: 10.7326/M15-2421. PubMed PMID: 27368068.

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