Table.
Results of tests on infants done before, during, and after exposure to 15% oxygen. Values are medians (range)
| Pre-challenge | Challenge | Post-challenge | P values
|
|||
|---|---|---|---|---|---|---|
| Pre-challenge v challenge | Challenge v post-challenge | Pre-challenge v post-challenge | ||||
| Measurements: | ||||||
| Oxygen saturation (%) | 97.6 (94.0 to 100) | 92.8 (84.7 to 100) | 97.5 (90.0 to 100) | <0.001 | <0.01 | >0.05 |
| Heart rate/min | 123 (105 to 140) | 131 (107 to 146) | 130 (99 to 144) | <0.01 | >0.05 | <0.05 |
| Respiratory rate/min | 30 (21 to 53) | 32 (20 to 58) | 31 (18 to 55) | >0.05 | >0.05 | >0.05 |
| Percentage of time spent in regular breathing pattern | 27 (0 to 53) | 16 (0 to 44) | 25 (7 to 83) | <0.001 | <0.001 | >0.05 |
| No of episodes of desaturation/h | 0 (0 to 0.2) | 0.4 (0 to 35) | 0 (0 to 0) | <0.001 | <0.01 | >0.05 |
| Apnoea: | ||||||
| Percentage of time spent in periodic apnoea | 0.7 (0 to 31) | 2.4 (0 to 35) | 0.2 (0 to 11) | <0.001 | <0.001 | <0.05 |
| Longest episode of periodic apnoea (min) | 1.4 (0.9 to 20.5) | 4.3 (0.4 to 34.8) | 1.4 (0.5 to 4.8) | <0.01 | <0.05 | >0.05 |
| Isolated apnoeic pauses/h | 6.2 (0 to 13) | 7.3 (0 to 19) | 7.9 (0 to 17) | >0.05 | >0.05 | >0.05 |
| Percentage of apnoeic pauses ⩾8 s | 9.0 (0 to 33) | 1.8 (0 to 47) | 4.9 (0 to 50) | <0.001 | <0.05 | >0.05 |