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Lung function, COPD and cognitive function: a multivariable and two sample Mendelian randomization study.

Daniel H Higbee^1,2, Raquel Granell¹, Gibran Hemani¹

¹MRC Integrative Epidemiology Unit (IEU), University of Bristol, Oakfield Grove, Bristol, BS8 2BN, UK.

BMC Pulmonary Medicine

|July 23, 2021

Summary

This summary is machine-generated.

This study found no evidence that reduced lung function or COPD directly causes cognitive decline. Further research should explore shared risk factors for both conditions instead.

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Area of Science:

Genetics and Epidemiology
Neuroscience
Respiratory Medicine

Background:

Observational studies suggest a link between decreased lung function and cognitive impairment.
Cognitive dysfunction is a precursor to dementia, with limited treatment options.
Identifying modifiable risk factors is crucial for preventing cognitive decline.

Purpose of the Study:

To investigate whether lung function or risk of Chronic Obstructive Pulmonary Disease (COPD) causally influences cognitive function using Mendelian randomization (MR).

Main Methods:

Utilized single nucleotide polymorphisms (SNPs) from genome-wide association studies for lung function and COPD as instrumental variables.
Assessed the effect of these genetic variants on general cognitive function in a large cohort (n=132,452).
Employed multivariable Mendelian randomization (MVMR) to analyze the causal relationships, adjusting for covariates like height and educational attainment.

Main Results:

Initial analysis showed weak evidence for a causal link between reduced lung function or COPD risk and lower cognitive function.
Multivariable MR indicated that reduced FEV1 and FVC might influence cognitive function, but this association weakened significantly after adjusting for height and educational attainment.
The causal effect estimates were not statistically significant after covariate adjustment.

Conclusions:

The study did not find robust evidence that reduced lung function or COPD directly causes impaired cognitive function.
Observed associations in previous studies may be attributable to residual confounding.
Future research should focus on identifying shared risk factors for both respiratory and cognitive health, rather than solely viewing lung function as a modifiable risk factor for cognitive decline.