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Predicting cognitive decline in patients with hypoxaemic COPD

R A Incalzi1, F Chiappini, L Fuso

  • 1Department of Geriatrics, Catholic University of the Sacred Heart, Rome, Italy.

Respiratory Medicine
|August 6, 1998
PubMed
Summary

Cognitive decline in COPD patients on oxygen therapy is faster with severe bronchial obstruction. The onset of depression, not baseline symptoms, predicts this decline.

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Area of Science:

  • Pulmonary Medicine
  • Neurology
  • Geriatrics

Background:

  • Hypoxaemic COPD patients on continuous oxygen therapy are at risk for cognitive decline.
  • Predictors of cognitive decline in this population require further investigation.

Purpose of the Study:

  • To identify predictors of cognitive decline in patients with hypoxaemic COPD receiving continuous oxygen therapy.

Main Methods:

  • Prospective study of 84 ambulatory hypoxaemic COPD patients over 2 years.
  • Baseline assessments included respiratory function, blood gas analysis, Mini Mental Status (MMS), Geriatric Depression Scale (GDS), Activities of Daily Living (ADLs), and Charlson's comorbidity index.
  • Reassessments at 1 and 2 years, with changes analyzed using Friedman's ANOVA by rank test.

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Main Results:

  • Cognitive function (MMS) declined significantly over 2 years in patients who completed the study.
  • Patients experiencing cognitive decline had lower baseline FVC and FEV1, indicating more severe bronchial obstruction.
  • Cognitive decline was inversely correlated with changes in GDS scores, suggesting a link with affective status.

Conclusions:

  • Severe bronchial obstruction is a predictor of faster cognitive decline in COPD patients on oxygen therapy.
  • The onset of depression, rather than pre-existing depressive symptoms, appears to be a risk factor for cognitive decline.
  • Cognitive decline parallels worsening affective status in this patient group.