Fig. 2
a Oxygen saturation (SaO2) considered indicative of clinical deterioration. b Supplemental oxygen considered indicative of clinical deterioration. Abbreviations: L = liters, NRB = non-rebreather mask, PPV = positive pressure ventilation. *Results are standardized according to percentage of respondents answering question. In a, 266 and 240 respondents provided oxygen saturations indicative of clinical deterioration at rest and with exercise, respectively. In b, between 198 and 241 respondents stated whether a given level of supplemental oxygen constituted clinical deterioration. **Supplemental oxygen required to maintain the oxygen saturation (SaO2) named by the respondent as indicative of clinical deterioration (see Fig. 1). ***Supplemental oxygen required to make the patient “subjectively more comfortable” even though not required to maintain oxygen saturation (SaO2)