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Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
Published on: February 2, 2024
Exercise-Induced Desaturation in COPD Patients Postexacerbation: Impact of Different Definitions on Prevalence Rates
Beatrice Salvi1, Mara Paneroni1, Carla Simonelli1
1Respiratory Rehabilitation Unit, Istituti Clinici Scientifici Maugeri IRCCS, Lumezzane, Brescia, Italy.
The Clinical Respiratory Journal
|June 1, 2026
Summary
Exercise-induced oxygen desaturation (EID) prevalence in COPD patients varies significantly based on definition. A review found good agreement between definitions, but the most conservative identified EID in only 15% of patients.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
Background:
- Exercise-induced oxygen desaturation (EID) is a decrease in SpO2 during exertion, common in COPD.
- Inconsistent definitions of EID hinder research and clinical practice.
Purpose of the Study:
- Evaluate various EID definitions in scientific literature.
- Determine EID prevalence during the 6-min walking test (6MWT) in COPD patients undergoing pulmonary rehabilitation (PR).
- Assess agreement between different EID definitions.
Main Methods:
- Conducted a scoping review to identify EID definitions.
- Retrospectively analyzed EID prevalence in 954 COPD patients during 6MWT using selected definitions.
- Assessed inter-definition agreement using Fleiss' kappa.
Main Results:
- Identified 23 distinct EID definitions across 62 reviewed articles.
- The most common criterion was a ≥4% decrease in SpO2.
- EID prevalence ranged from 15.6% to 38.7% based on the definition used; overall agreement was good (kappa=0.718).
Conclusions:
- EID prevalence in COPD patients recovering from exacerbation varies widely with definition.
- While definitions showed good agreement, the most conservative identified EID in only 15% of patients.
- Further research is needed to establish the optimal EID definition for clinical use and outcome prediction.
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