81 The Relationship Between Fist-Edge-Palm Performance and Informant Related Functional Status in Elderly Veterans
Authors: Moore Ian J , Comnick Ian D , Okolichany Ron , Mooney Scott , Padala Prasad 
Published: December 2023

Objective:Explore the relationship between a motor programming and sequencing procedure and informant rating of patients' functional abilities, especially driving. The Fist-Edge-Palm (FEP; Luria, 1970; 1980) task has previously demonstrated merit distinguishing between healthy controls and those with neurodegenerative processes (Weiner et al., 2011). However, associations between FEP performance and informant-rated functional status, particularly driving ability, have been minimally reported. This exploratory review examined the relationship between FEP, informant-rated driving ability, overall functional impairment, and neurocognitive diagnostic severity.Participants and Methods:41 Veterans seen in a South-Central VA Memory Clinic between 08/2020 and 07/2022 served as participants. Neuropsychological assessment included gathering demographic information, chairside neurobehavioral examination (including FEP), cognitive testing, and collateral informant completed Functional Activities Questionnaire (FAQ). Diagnostic severity [no diagnosis, mild cognitive impairment (MCI), dementia (MNCD)] was determined based on the patient's cognitive and functional deficits as measured by neuropsychological testing and informant-rated functional deficits. Correlational analyses were conducted to examine the strength of possible relationships between FEP performance, diagnostic severity, informant-rated functional status including driving impairment. Linear regression analyses determined the extent to which diagnostic severity and FEP performance predict informant-reported driving and ADL impairmentsResults:Participants were 97.5% male, 78% white, 22% black. Diagnostically, 3 patients received no diagnoses, 14 with MCI, and 24 with MNCD. Spearman rank correlations were computed; FEP performance was moderately negatively correlated with diagnostic severity [rho = -.35; p < .05] and driving impairment [rho = -.31; p < .05]. Diagnostic severity was moderately positively correlated with driving [rho= .44; p < .05] and total functional [rho = .65; p < .05] impairment. Total functional impairment positively correlated with reported driving impairment [rho = .58; p < .05]. Simple linear regressions tested if FEP performance and diagnostic severity independently predicted informant-reported driving and functional impairment. FEP performance predicted diagnostic severity (R2 = .12, p < .05) and reported driving impairment severity (R2 = .10, p <.05) but did not predict total functional impairment severity (R2 = .06, p = .14). Diagnostic severity predicted both informant-reported driving impairment severity (R2 = .16, p <.05) and functional severity (R2 = .30, p < .05). Multiple regression tested if diagnostic severity and FEP performance together was more predictive of driving and functional impairment than individually; the overall model was predictive of driving (R2 = .19, p < .05) and total functional (R2 = .30, p < .05) impairment, but only diagnostic severity significantly predicted reported driving (B = .63, p < .05) and functional (B = 6.25, p < .05) impairments.Conclusions:FEP performance was associated with diagnosis and collateral informant concerns of patient driving ability but not statistically related to overall functional impairment or nondriving related ADLs. FEP demonstrates utility in identification of patients demonstrating concerning driving fitness per collateral informants and diagnostic severity due to rapidity of administration, ease of instructing providers, and implementation in a wide variety of clinical settings when a caregiver or informant may not be available. Future directions include explaining the relationship between FEP and driving ability and exploring associations between FEP and other neuropsychological instruments.