TY - JOUR
T1 - Poorer cognitive performance in patients with essential tremor-Parkinson's disease vs. patients with Parkinson's disease
AU - Louis, Elan D.
AU - Rohl, Brittany
AU - Collins, Kathleen
AU - Cosentino, Stephane
N1 - Publisher Copyright:
© 2015 Louis, Rohl, Collins and Cosentino.
PY - 2015
Y1 - 2015
N2 - Background: Patients with essential tremor (ET) seem to be at increased risk of developing Parkinson's disease (PD). Surprisingly, little has been written about this clinical entity, ET-PD. Cognitive dysfunction is a well-known feature of PD, and can also be an issue in patients with ET. Whether the presence of the combined diagnosis, ET-PD, is associated with additive cognitive effects as compared with PD has not been studied. Methods: Thirty ET-PD patients and 53 age-matched PD patients were enrolled in a clinical-epidemiological study. Two cognitive screens, the Telephone Interview for Cognitive Status (TICS, score = 0-41) and Folstein Mini-Mental State Examination (MMSE; range 0-30), were administered. Results: The MMSE score was lower in ET-PD than PD [26.5 ± 3.1 (median 28.0) vs. 28.4 ± 2.2 (median 29.0), p = 0.001]. The TICS score was lower in ET-PD than PD [31.7 ± 3.9 (32.0) vs. 35.0 ± 2.0 (35.0), p < 0.001]. Subscores of these tests that related to orientation (p < 0.001), language (p < 0.001), and working memory (p = 0.001) were lower in ET-PD than PD, whereas the delayed memory subscore was only marginally lower in ET-PD than PD (p = 0.06), and the two groups did not differ with respect to the motor/construction subscore (p = 0.22). Both global cognitive scores were inversely correlated with disease duration (for MMSE score, Spearman's r = -0.46, p < 0.001; for TICS score, Spearman's r = -0.53, p < 0.001). Conclusion: The combined diagnosis, ET-PD, seemed to be associated with additive cognitive effects as compared with PD alone.
AB - Background: Patients with essential tremor (ET) seem to be at increased risk of developing Parkinson's disease (PD). Surprisingly, little has been written about this clinical entity, ET-PD. Cognitive dysfunction is a well-known feature of PD, and can also be an issue in patients with ET. Whether the presence of the combined diagnosis, ET-PD, is associated with additive cognitive effects as compared with PD has not been studied. Methods: Thirty ET-PD patients and 53 age-matched PD patients were enrolled in a clinical-epidemiological study. Two cognitive screens, the Telephone Interview for Cognitive Status (TICS, score = 0-41) and Folstein Mini-Mental State Examination (MMSE; range 0-30), were administered. Results: The MMSE score was lower in ET-PD than PD [26.5 ± 3.1 (median 28.0) vs. 28.4 ± 2.2 (median 29.0), p = 0.001]. The TICS score was lower in ET-PD than PD [31.7 ± 3.9 (32.0) vs. 35.0 ± 2.0 (35.0), p < 0.001]. Subscores of these tests that related to orientation (p < 0.001), language (p < 0.001), and working memory (p = 0.001) were lower in ET-PD than PD, whereas the delayed memory subscore was only marginally lower in ET-PD than PD (p = 0.06), and the two groups did not differ with respect to the motor/construction subscore (p = 0.22). Both global cognitive scores were inversely correlated with disease duration (for MMSE score, Spearman's r = -0.46, p < 0.001; for TICS score, Spearman's r = -0.53, p < 0.001). Conclusion: The combined diagnosis, ET-PD, seemed to be associated with additive cognitive effects as compared with PD alone.
KW - Clinical
KW - Cognition
KW - Dementia
KW - Essential tremor
KW - Parkinson's disease
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U2 - 10.3389/fneur.2015.00106
DO - 10.3389/fneur.2015.00106
M3 - Article
C2 - 26042084
AN - SCOPUS:84930671204
SN - 1664-2295
VL - 6
JO - Frontiers in Neurology
JF - Frontiers in Neurology
IS - MAY
M1 - 00106
ER -