The Association Between Hemoglobin Level and Cognitive Function in Older Adults During Hospitalization: A Prospective...

Area of Science:

• Gerontology
• Neuroscience
• Hematology

Background:

• Mildly low hemoglobin (Hb) is linked to cognitive deficits in ambulatory settings.
• Hospitalized patients often have lower Hb levels due to transfusion policies.
• Older adults are at increased risk for cognitive impairment and may be more sensitive to low Hb.

Purpose of the Study:

• To investigate the association between restrictive hemoglobin levels during hospitalization and cognitive function.
• To specifically examine this association in older adult populations.

Main Methods:

• Prospective observational study of 5112 hospitalized patients with Hb < 10 g/dL.
• Cognitive function assessed using the Short Portable Mental Status Questionnaire (SPMSQ).
• Statistical analysis using zero-inflated Poisson and logistic regression, controlling for covariates.

Main Results:

• Lower nadir Hb levels were significantly associated with decreased cognition (higher SPMSQ scores).
• A 1 g/dL decrease in Hb correlated with a 7.2% increase in SPMSQ scores across all ages.
• The impact of lower Hb on cognition was amplified in older adults (8.8% increase for >50 years, 20.8% for >65 years).

Conclusions:

• Hospitalized patients with lower hemoglobin levels experience diminished cognitive function.
• Older adults are particularly vulnerable to cognitive decline associated with lower Hb levels during hospitalization.