Tidal breathing parameters in 30 infants at term age measured with Volusense Pediatrics (VSP) (VoluSense, Bergen, Norway) without and with simultaneous application of a facemask
| VSP only | VSP+mask simultaneously | Mean difference (95% CI) | Per cent difference (95% CI) | p-value | |
| Number of breathing cycles analysed | 44.1±14.1 | 60.2±26.3 | |||
| Tidal breathing parameters | |||||
| VT mL | 15.0±3.1 | 20.1±4.3 | 5.0 (4.2–5.9) | 34.3 (29.2–39.5) | 0.0001 |
| VT mL·kg−1 | 4.5±1.2 | 6.1±1.7 | 1.5 (1.3–1.8) | 34.3 (29.2–39.5) | 0.0001 |
| V′E·mL·min−1·kg−1 | 275.7±91.8 | 358.7±113.8 | 83.0 (57.0–109.0) | 33.8 (24.2–43.4) | 0.0001 |
| Respiratory rate per min | 63.0±19.7 | 61.4±16.0 | −1.6 (−4.8–1.6) | −0.2 (−5.4–4.9) | 0.31 |
| PTEF mL·s−1 | 46.6±16.9 | 62.1±22.7 | 15.5 (9.9–21.1) | 37.5 (24.9–50.2) | 0.0001 |
| tPTEF/tE % | 41.5±10.8 | 42.2±11.4 | 0.7 (−2.8–4.2) | 3.7 (−5.5–13.0) | 0.69 |
| tI/tE % | 78.9±9.7 | 89.4±13.4 | 10.4 (6.4–14.5) | 13.7 (8.5–18.9) | 0.0001 |
| TEF50/PTEF % | 90.3±5.7 | 92.2±6.0 | 2.0 (0.5–3.4) | 2.2 (0.6–3.9) | 0.009 |
Data are presented as mean±sd unless otherwise stated. VT: tidal volume; V′E: minute ventilation. PTEF: peak tidal expiratory flow; tPTEF: time to peak tidal expiratory flow; tE: total expiratory time; tI: inspiratory time; TEF50: tidal expiratory flow at 50% of expiratory volume. p-values are from paired-sample t-tests.