Abstract 112: Internal Consistency Between Cognitive Tests for Survivors of Cardiac Arrest

Abstract

Introduction: Cardiac arrest survivors suffer cognitive impairment easily missed on a clinical examination. We evaluated a battery of cognitive tests including the Cerebral Performance Category Extended (CPC-E), Montreal Cognitive Assessment (MoCA), and the Computer Assessment of Cognitive Impairment (CAMCI) to evaluate these deficits. Hypothesis: The CPC-E, MoCA and CAMCI tests correlate with one another, but the internal consistency of each test differs. Methods: Chart review of 201 cardiac arrest survivors occurred between October 2010 and January 2018. Pearson’s correlation was used to assess between-test correlation while Cronbach’s alpha was used to assess internal consistency of each test. We evaluated both the overall measure score and individual items in the measure. Results: Complete assessments were available for 50 subjects, 75 completed both the MoCA and the CAMCI, 57 completed both the CPC-E and the CAMCI, and 76 completed the MoCA and the CPC-E. Internal consistencies existed within both the MoCA and the CPC-E (Cronbach alpha = 0.661, and 0.738, respectively), while only borderline internal consistency was found within the CAMCI (Cronbach alpha = 0.638). At the scale level moderate or limited correlation existed between tests (Figure). At the item level, the CAMCI had little to no correlation with items of the CPC-E or MoCA. Moderate correlations existed between item specific domains of visuospatial, attention and delayed recall items of the MoCA and domains of alert, logical thinking, attention, and short term memory of the CPC-E (r=0.3-0.5). Conclusions: Strong correlation between the CAMCI and MoCA suggests they evaluate similar domains of function. The MoCA is shorter, easily administered and inexpensive, arguing for its use over the CAMCI. The CPC-E’s strong internal consistency and moderate correlation with the MoCA suggests it may provide additional discrimination of cognitive function in the cardiac arrest population.