Time Course of Symptoms and Oximetry Variables At Exacerbation. Time course of heart rate, oxygen saturation (SpO2) and peak-expiratory flow (PEF) from seven days prior (-7) to exacerbation onset (day 0, vertical line) and seven days into exacerbation of COPD. Data expressed as mean and 95%CI (in SD units) for each variable separately.
Hurst et al. BMC Pulmonary Medicine 2010 10:52 doi:10.1186/1471-2466-10-52