Table 2.
Peak flow and %negative effort comparison
| Attempted Simulated Breaths |
Successful Breaths |
Peak Flow Comparison (Contiguous Pair Analysis) |
%Negative Effort (Using Common Downstream Pressure) |
Maximum %Negative Effort Dependence (Maximum %NED Seen, and Corresponding Downstream Pressure) |
||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Subject No. (Type) | Total | No central apnea | Arousal | No flow limitation | Limited down-stream pressure change | Analyzable breaths | Common down-stream pressure, cmH2O | Slow | Fast | No. of pairs | Slow, l/s | Fast, l/s | Slow, % | Fast, % | Slow, % | Pressure, cmH2O | Fast, % | Pressure, cmH2O |
| 1 (Control) | 76 | 7 | 18 | 28 | 8 | 15 | −4.8 | 8 | 7 | 1 | 0.12 | 0.14 | 18.8 ± 8.9 | 17.0 ± 13.7 | 42.8 | −5 | 64.1 | −5.7 |
| 2 (OSA) | 32 | 8 | 2 | 14 | 3 | 5 | −3.3 | 3 | 2 | 0 | 16.1 ± 8.9 | 24.8 ± 33.8 | 40.8 | −3.7 | 52.3 | −3.4 | ||
| 3 (Control) | 27 | 3 | 4 | 11 | 0 | 9 | −4.1 | 5 | 4 | 1 | 0.09 | 0.08 | 28.1 ± 11.8 | 20.5 ± 6.8 | 56 | −5.3 | 31 | −5 |
| 4 (OSA) | 37 | 4 | 9 | 15 | 5 | 4 | −7.1 | 3 | 2 | 0 | 16.3 ± 17.8 | 12.4 ± 7.9 | 22.8 | −9.8 | 27.8 | −7.6 | ||
| 5 (OSA) | 32 | 4 | 6 | 10 | 6 | 6 | −5.2 | 3 | 3 | 2 | 0.4 | 0.42 | 26.1 ± 21.5 | 21.0 ± 6.2 | 46.9 | −5.2 | 34.6 | −5.6 |
| 6 (Control) | 34 | 2 | 9 | 8 | 4 | 11 | −4.7 | 3 | 8 | 6 | 0.25 | 0.26 | 4.8 ± 3.7 | 12.9 ± 12.5 | 29.6 | −8.2 | 42.6 | −6.8 |
| 7 (Control) | 46 | 0 | 6 | 6 | 6 | 28 | −4.6 | 9 | 17 | 4 | 0.25 | 0.27* | 18.1 ± 9.0 | 22.0 ± 15.0 | 35 | −5.6 | 56 | −5.6 |
| 8 (OSA) | 50 | 2 | 17 | 6 | 15 | 10 | −6.5 | 3 | 7 | 1 | 0.14 | 0.15 | 49.8 ± 32.5 | 27.7 ± 16.7 | 83 | −6.5 | 70 | −7.9 |
| Average | 41.8 | 11 | −5.0 | 22.3 | 19.8 | 44.6 | 47.3 | |||||||||||
NED, negative effort dependence.
*
Peak flow (see boldface) is only statistically significant different (P < 0.05) in one subject.