linear regression algorithms on artefact-free breaths with amplitudes within the mean±1SD. A sequence of optimising iterations for computer breath selection produced best-fit regression coefficients with the PNT flow. Transpulmonary pressure was measured by esophageal catheter. Lung compliance and airway resistance were computed by a least mean square technique. Ribcage to abdominal phase angle (phi), Laboured breathing index (LBI), and phase relation in total breath (PhRTB) were computed from

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... nalysis of RIP ribcage and abdomen excursions. Validation measurements were performed on 18 infants of 28-35wks GA. Results Correlation coefficients for compliance and resistance by PNT vs. RIP were r 2 =0.9737 and 0.8980 respectively. LBI for these infants was 1.2 ± 0.6, phi was 54.4 ± 7.4 degrees and PhRTB was 33.4 ± 3.1%. Conclusion When properly calibrated, RIP derived respiratory mechanics measurements provide sufficient diagnostic accuracy in infants receiving NIV support. Abstract O-077 Figure 1