Can spirometry, pulse oximetry and dyspnea scoring reflect respiratory failure in patients with chronic obstructive pulmonary disease exacerbation?
OBJECTIVE: To evaluate the extent to which oximetry, spirometry and dyspnea scoring can reflect hypoxemia and hypercapnia among patients admitted to the emergency department (ED) with acute exacerbations of chronic obstructive pulmonary disease. SUBJECTS AND METHODS: Spirometry, oxygen saturation by pulse oximetry (SpO2), arterial blood gas analysis and dyspnea scoring assessments were made in the ED. Correlations of these parameters were evaluated by means of Pearson’s test. Pulse oximetry cutoff values to express hypoxemia were demonstrated by receiver operating characteristic (ROC) curves. RESULTS: 76 patients with a mean age of 68.0 years were included in the study. Mean spirometric values, expressed as percentages of predicted values, were forced expiratory volume in 1 s (FEV1) = 23.1 +/- 9%; forced vital capacity (FVC) = 32.8 +/- 11%, and mean FEV1/FVC = 72.4 +/- 21.6%. While there was a positive correlation between the SpO2, SaO2 and PaO2 values (r = 0.91 and 0.80, respectively)
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