DEMENTIA AND GERIATRIC COGNITIVE DISORDERS

Halaas NB, Blennow K, Idland AV, Wyller TB, Raeder J, Frihagen F, Staff AC, Zetterberg H and Watne LO

Dement Geriatr Cogn Disord. 2018 Dec 6;46(5-6):346-357

DOI: 10.1159/000494754.

This study was peformed using a Simoa® Homebrew assay.

Abstract

Background:

Delirium is associated with new-onset dementia, suggesting that delirium pathophysiology involves neuronal injury. Neurofilament light (NFL) is a sensitive biomarker for neuroaxonal injury.

Methods:

NFL was measured in cerebrospinal fluid (CSF) (n = 130), preoperative serum (n = 192), and postoperative serum (n = 280) in hip fracture patients, and in CSF (n = 123) and preoperative serum (n = 134) in cognitively normal older adults undergoing elective surgery. Delirium was diagnosed with the Confusion Assessment Method.

Results:

Median serum NFL (pg/mL) was elevated in delirium in hip fracture patients (94 vs. 54 pre- and 135 vs. 92 postoperatively, both p < 0.001). Median CSF NFL tended to be higher in hip fracture patients with delirium (1,804 vs. 1,636, p = 0.074). Serum and CSF NFL were positively correlated (ρ = 0.56, p < 0.001).

Conclusion:

Our findings support an association between neuroaxonal injury and delirium. The correlation between serum and CSF NFL supports the use of NFL as a blood biomarker in future delirium studies.