The Timed Up and Go test predicts frailty in patients with COPD

Area of Science:

• Gerontology
• Pulmonology
• Biomedical Engineering

Background:

• Frail patients with chronic obstructive pulmonary disease (COPD) often remain undiagnosed.
• The Timed Up and Go (TUG) test is a recognized measure of mobility and frailty.
• Early identification of frailty in COPD is crucial for timely intervention.

Purpose of the Study:

• To investigate the efficacy of the TUG test in identifying frail individuals with COPD.
• To determine if TUG performance differentiates between frail and non-frail COPD patients.
• To assess the TUG test's ability to detect frailty independent of age and lung function severity.

Main Methods:

• A cohort of 520 COPD patients and 150 controls underwent frailty assessment using a Comprehensive Geriatric Assessment questionnaire to derive a frailty index (FI).
• The TUG test was administered to all participants to measure physical mobility.
• Lung function and body composition were assessed; ROC curve analysis was used to evaluate TUG's discriminative ability.

Main Results:

• COPD patients exhibited significantly higher frailty index scores (0.16 ± 0.08) compared to controls (0.05 ± 0.03).
• Frail COPD patients demonstrated longer TUG times (11.55 ± 4.03s) than non-frail COPD patients (9.2 ± 1.6s) and controls (8.3 ± 1.2s), even after adjusting for age and lung function.
• The TUG test showed good discrimination between frail and non-frail COPD patients (AUC 72%, diagnostic odds ratio 2.67).

Conclusions:

• The TUG test is a valuable tool for screening frailty in COPD patients.
• TUG performance reliably distinguishes frail from non-frail individuals with COPD, irrespective of age or airflow obstruction severity.
• The TUG's simplicity and speed make it suitable for widespread clinical application in COPD frailty assessment.