Table 3.
Infant PFT Acceptability
| Criteria Not Met for Infant PFT Measurements | Baseline Visit (N=73) | 48 week Visit (N=70) |
|---|---|---|
| FRC | ||
| Total Measurements Not Acceptable | 0 | 2 |
| Box Signal Drift | 1 | |
| Mouth pressure and box volume signals not in-phase | 1 | |
| Minimum of 3 technically satisfactory FRC measurements not noted | 2 | |
| RVRTC | ||
| Total Measurements Not Acceptable | 11 | 13 |
| Forced exhalation not complete (premature termination) | 9 | 5 |
| Sigh breath before forced exhalation | 3 | 1 |
| Lack of flow limitation | 11 | 13 |
| Glottic closure | 7 | 5 |
| Peak flow not achieved prior to exhalation of 10% of the volume | 7 | 6 |
| 2 technically acceptable curves with indices within 10% of one another not noted | 11 | 13 |
| ERV | ||
| Total Measurements Not Acceptable | 16 | 20 |
| Tidal breathing data not collected for minimum of 15 seconds prior to inflation | 1 | 20 |
| Tidal breathing data not collected for minimum of 30 seconds post-forced exhalation | 2 | 3 |
| Minimum of 2 to 3 acceptable ERV measures within 10% of one another not noted | 16 | 4 |