Test-retest reliability and short-term variability of quantitative light reflex pupillometry in a mixed memory clinic cohort
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Test-retest reliability and short-term variability of quantitative light reflex pupillometry in a mixed memory clinic cohort. / Gramkow, Mathias Holsey; Clemmensen, Frederikke Kragh; Waldemar, Gunhild; Hasselbalch, Steen Gregers; Frederiksen, Kristian Steen.
I: Journal of the Neurological Sciences, Bind 456, 122856, 2024.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Test-retest reliability and short-term variability of quantitative light reflex pupillometry in a mixed memory clinic cohort
AU - Gramkow, Mathias Holsey
AU - Clemmensen, Frederikke Kragh
AU - Waldemar, Gunhild
AU - Hasselbalch, Steen Gregers
AU - Frederiksen, Kristian Steen
N1 - Publisher Copyright: © 2023 The Author(s)
PY - 2024
Y1 - 2024
N2 - Background: Quantitative light reflex pupillometry (qLRP) may be a promising digital biomarker in neurodegenerative diseases such as Alzheimer's disease (AD), as neuropathological changes have been found in the midbrain structures governing the light reflex. Studies investigating test-retest reliability and short-term, intra-subject variability of qLRP in these patient groups are missing. Our objective was therefore to investigate the test-retest reliability and short-term, intra-subject variability of qLRP in a memory clinic setting, where patients with neurodegenerative disease are frequently evaluated. Methods: Test-retest reliability study. We recruited patients from a tertiary memory clinic and qLRP was carried out at a baseline visit and then repeated on day 3–14 and on day 21–35 using a hand-held pupillometer. We evaluated the test-retest reliability of qLRP by calculating intraclass correlation coefficients (ICCs) and intra-subject, short-term variability by fitting linear mixed models. We compared ICCs for subgroups based on age, sex, disease severity (MCI vs. mild dementia), AD diagnosis, and amount of neurodegeneration (cerebrospinal fluid-total tau levels). Results: In total, 40 patients (mean age 72 years, 15 female, 22 with mild dementia) were included in the study. We found good-excellent reliability (ICC range 0.86–0.93) for most qLRP parameters. qLRP parameters exhibited limited intra-subject variability and we found no large sources of variability when examining subgroups. Conclusion: qLRP was found to have acceptable test-retest reliability and the study results pave the way for research using longitudinal or cross-sectional measurements to assess the construct in identifying and prognosticating neurodegenerative diseases.
AB - Background: Quantitative light reflex pupillometry (qLRP) may be a promising digital biomarker in neurodegenerative diseases such as Alzheimer's disease (AD), as neuropathological changes have been found in the midbrain structures governing the light reflex. Studies investigating test-retest reliability and short-term, intra-subject variability of qLRP in these patient groups are missing. Our objective was therefore to investigate the test-retest reliability and short-term, intra-subject variability of qLRP in a memory clinic setting, where patients with neurodegenerative disease are frequently evaluated. Methods: Test-retest reliability study. We recruited patients from a tertiary memory clinic and qLRP was carried out at a baseline visit and then repeated on day 3–14 and on day 21–35 using a hand-held pupillometer. We evaluated the test-retest reliability of qLRP by calculating intraclass correlation coefficients (ICCs) and intra-subject, short-term variability by fitting linear mixed models. We compared ICCs for subgroups based on age, sex, disease severity (MCI vs. mild dementia), AD diagnosis, and amount of neurodegeneration (cerebrospinal fluid-total tau levels). Results: In total, 40 patients (mean age 72 years, 15 female, 22 with mild dementia) were included in the study. We found good-excellent reliability (ICC range 0.86–0.93) for most qLRP parameters. qLRP parameters exhibited limited intra-subject variability and we found no large sources of variability when examining subgroups. Conclusion: qLRP was found to have acceptable test-retest reliability and the study results pave the way for research using longitudinal or cross-sectional measurements to assess the construct in identifying and prognosticating neurodegenerative diseases.
KW - Alzheimer's disease
KW - Light reflex
KW - Memory clinic
KW - Neurodegeneration
KW - Quantitative pupillometry
KW - Test-retest
U2 - 10.1016/j.jns.2023.122856
DO - 10.1016/j.jns.2023.122856
M3 - Journal article
C2 - 38154247
AN - SCOPUS:85182283538
VL - 456
JO - Journal of the Neurological Sciences
JF - Journal of the Neurological Sciences
SN - 0022-510X
M1 - 122856
ER -
ID: 380217302