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Pulse Oximetry Overestimates Oxygen Saturation in COPD
Sridhar Amalakanti1, Mohan Rao Pentakota2
1Department of Neurology iamimenotu@gmail.com.
Respiratory Care
|December 31, 2015
Summary
Pulse oximetry is a useful tool for detecting hypoxemia in COPD patients. However, it performed poorly compared to arterial blood gas analysis, especially in chronic bronchitis.
Area of Science:
- Pulmonary Medicine
- Critical Care Medicine
Background:
- Pulse oximetry is a common non-invasive method for measuring oxygen saturation.
- Its utility in Chronic Obstructive Pulmonary Disease (COPD) patients, particularly those with chronic bronchitis and emphysema, requires further investigation.
Purpose of the Study:
- To evaluate the performance of handheld pulse oximetry in patients with COPD experiencing acute respiratory failure.
- To compare pulse oximetry readings with invasive arterial blood gas analysis.
Main Methods:
- A cross-sectional, observational study was conducted on 50 COPD patients admitted to a tertiary referral hospital.
- Simultaneous measurements of peripheral oxygen saturation (SpO2) and arterial oxygen saturation (SaO2) were obtained.
Main Results:
- Pulse oximetry demonstrated 84.60% sensitivity for detecting hypoxemia in respiratory failure.
- The mean difference (bias) between SaO2 and SpO2 was -3.98.
- Lower sensitivity and positive predictive value were observed in chronic bronchitis patients compared to emphysema patients.
Conclusions:
- Pulse oximetry's performance was suboptimal when compared to arterial blood gas analysis in COPD patients.
- Higher variability in readings was noted in patients with chronic bronchitis than in those with emphysema.
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