The baseline characteristics and vital signs between the treatment groups were well
matched (Table 1). Patient treatments after randomization are shown in Table 2. Patient reported
pain scores, opioid requirements and hemodynamics were similar between the two groups
(Supplemental Table 8). The majority (99.5%) of patients allocated to oxygen received oxygen
at 8 L/min, whilst a small proportion (7.7%) of patients in the no oxygen group required oxygen
at 4 L/min either before or upon arrival to the cardiac catheterization laboratory (Supplemental
Figure 2). There was a significant difference in oxygen saturations (P