Abstract
Introduction: Patients with chronic obstructive pulmonary disease (COPD) exhibit varying degrees of hypoxemia depending on the stage of the disease, with pulse oximetry (SpO2) being a practical and non-invasive method to assess blood oxygen saturation. In clinical situations where patients may have moderate hypoxemia [partial pressure of arterial oxygen (PaO2) > 55 to < 60 mmHg], the devi…