Obstructive Sleep Apnea Syndrome Is Associated with Deficits in Verbal but Not Visual Memory

Although cognitive deficits are well documented in patients with sleep apnea, the impact on memory remains unclear. To test the hypotheses that (1) patients with obstructive sleep apnea have memory impairment and (2) memory impairment is commensurate with disease severity. Patients with obstructive...

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Veröffentlicht in:American journal of respiratory and critical care medicine 2010-07, Vol.182 (1), p.98-103
Hauptverfasser: TWIGG, Gillian L, PAPAIOANNOU, Loannis, JACKSON, Melinda, GHIASSI, Ramesh, SHAIKH, Zarrin, JAYE, Jay, GRAHAM, Kim S, SIMONDS, Anita K, MORRELL, Mary J
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container_title American journal of respiratory and critical care medicine
container_volume 182
creator TWIGG, Gillian L
PAPAIOANNOU, Loannis
JACKSON, Melinda
GHIASSI, Ramesh
SHAIKH, Zarrin
JAYE, Jay
GRAHAM, Kim S
SIMONDS, Anita K
MORRELL, Mary J
description Although cognitive deficits are well documented in patients with sleep apnea, the impact on memory remains unclear. To test the hypotheses that (1) patients with obstructive sleep apnea have memory impairment and (2) memory impairment is commensurate with disease severity. Patients with obstructive sleep apnea and healthy volunteers (apnea-hypopnea index
doi_str_mv 10.1164/rccm.200901-0065OC
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To test the hypotheses that (1) patients with obstructive sleep apnea have memory impairment and (2) memory impairment is commensurate with disease severity. Patients with obstructive sleep apnea and healthy volunteers (apnea-hypopnea index &lt;5 events/h) completed a test battery specially designed to differentiate between aspects of memory (semantic, episodic, and working) versus attention. Sleepiness was measured on the basis of the Epworth Sleepiness Scale and Oxford Sleep Resistance test. Memory performance in patients versus control subjects was compared (Mann-Whitney U test; P &lt; 0.01, Bonferroni corrected for multiple comparisons) and relationships between performance and disease severity were analyzed by linear regression. Sixty patients and healthy control subjects matched for age (mean +/- SD: patients, 51 +/- 9 yr; control subjects, 50 +/- 9 yr) and education (patients, 14 +/- 3 yr; control subjects, 15 +/- 3 yr) participated. Patients demonstrated impaired Logical Memory Test results (immediate recall: patients, median [range], 36 [9-69]; control subjects, 43 [19-64], P = 0.0004; and delayed recall: patients, 22 [6-42]; control subjects, 27 [10-46]; P = 0.0001). There were minimal differences in attention, visual episodic, semantic, or working memory; patients performed better than control subjects on Spatial Span forward and backward. Regression analysis revealed that Logical Memory Test performance was not significantly related to disease severity after controlling for age, education, and sleepiness. Obstructive sleep apnea is associated with impairment in verbal, but not visual, memory. The impairment was present across a range of disease severity and was not explained by reduced attention. 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To test the hypotheses that (1) patients with obstructive sleep apnea have memory impairment and (2) memory impairment is commensurate with disease severity. Patients with obstructive sleep apnea and healthy volunteers (apnea-hypopnea index &lt;5 events/h) completed a test battery specially designed to differentiate between aspects of memory (semantic, episodic, and working) versus attention. Sleepiness was measured on the basis of the Epworth Sleepiness Scale and Oxford Sleep Resistance test. Memory performance in patients versus control subjects was compared (Mann-Whitney U test; P &lt; 0.01, Bonferroni corrected for multiple comparisons) and relationships between performance and disease severity were analyzed by linear regression. Sixty patients and healthy control subjects matched for age (mean +/- SD: patients, 51 +/- 9 yr; control subjects, 50 +/- 9 yr) and education (patients, 14 +/- 3 yr; control subjects, 15 +/- 3 yr) participated. Patients demonstrated impaired Logical Memory Test results (immediate recall: patients, median [range], 36 [9-69]; control subjects, 43 [19-64], P = 0.0004; and delayed recall: patients, 22 [6-42]; control subjects, 27 [10-46]; P = 0.0001). There were minimal differences in attention, visual episodic, semantic, or working memory; patients performed better than control subjects on Spatial Span forward and backward. Regression analysis revealed that Logical Memory Test performance was not significantly related to disease severity after controlling for age, education, and sleepiness. Obstructive sleep apnea is associated with impairment in verbal, but not visual, memory. The impairment was present across a range of disease severity and was not explained by reduced attention. Such verbal memory impairment may affect daytime functioning and performance.</description><subject>Adult</subject><subject>Anesthesia. Intensive care medicine. Transfusions. 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To test the hypotheses that (1) patients with obstructive sleep apnea have memory impairment and (2) memory impairment is commensurate with disease severity. Patients with obstructive sleep apnea and healthy volunteers (apnea-hypopnea index &lt;5 events/h) completed a test battery specially designed to differentiate between aspects of memory (semantic, episodic, and working) versus attention. Sleepiness was measured on the basis of the Epworth Sleepiness Scale and Oxford Sleep Resistance test. Memory performance in patients versus control subjects was compared (Mann-Whitney U test; P &lt; 0.01, Bonferroni corrected for multiple comparisons) and relationships between performance and disease severity were analyzed by linear regression. Sixty patients and healthy control subjects matched for age (mean +/- SD: patients, 51 +/- 9 yr; control subjects, 50 +/- 9 yr) and education (patients, 14 +/- 3 yr; control subjects, 15 +/- 3 yr) participated. Patients demonstrated impaired Logical Memory Test results (immediate recall: patients, median [range], 36 [9-69]; control subjects, 43 [19-64], P = 0.0004; and delayed recall: patients, 22 [6-42]; control subjects, 27 [10-46]; P = 0.0001). There were minimal differences in attention, visual episodic, semantic, or working memory; patients performed better than control subjects on Spatial Span forward and backward. Regression analysis revealed that Logical Memory Test performance was not significantly related to disease severity after controlling for age, education, and sleepiness. Obstructive sleep apnea is associated with impairment in verbal, but not visual, memory. The impairment was present across a range of disease severity and was not explained by reduced attention. Such verbal memory impairment may affect daytime functioning and performance.</abstract><cop>New York, NY</cop><pub>American Thoracic Society</pub><pmid>20299536</pmid><doi>10.1164/rccm.200901-0065OC</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record>
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Journals@Ovid Complete; American Thoracic Society (ATS) Journals Online; Alma/SFX Local Collection
subjects Adult
Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy
Biological and medical sciences
Case-Control Studies
Chronic obstructive pulmonary disease, asthma
Cognitive ability
Female
G. Sleep and Control of Ventilation
Health care
Humans
Hypotheses
Intensive care medicine
Male
Mann-Whitney U test
Medical sciences
Memory
Memory Disorders - etiology
Mental Recall
Patients
Pattern Recognition, Visual
Pneumology
Polysomnography
Regression analysis
Semantics
Sleep apnea
Sleep Apnea, Obstructive - complications
Verbal Learning
title Obstructive Sleep Apnea Syndrome Is Associated with Deficits in Verbal but Not Visual Memory
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