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• W2171340897 abstract "Abstract Introduction We previously showed in animals that the ratio of inspired tidal volume (Vt insp ) to inspiratory peak electrical activity of the diaphragm (EAdi pk ) can be used to quantify the respective patient and ventilator breath contributions (PVBCs) during neurally adjusted ventilatory assist (NAVA). The PVBC index has not been tested clinically. Methods We studied 12 intubated and mechanically ventilated patients with acute respiratory failure and measured EAdi pk , airway (Paw) and inspiratory esophageal pressure (Pes) and Vt insp . We applied 11 different NAVA levels, increasing them every 3 minutes in steps of 0.3 cm H 2 O/μV from 0 to 3.0 cmH 2 O/μV. At each NAVA level, one breath was non-assisted (NAVA level 0). PVBC indices were calculated by relating Vt insp /EAdi pk of the non-assisted breath to Vt insp /EAdi pk of the assisted breath(s) using one ( N1 PVBC) or the mean value of five preceding assisted breaths ( X5 PVBC). During assisted breaths, inspiratory changes in Pes (∆Pes) and transpulmonary (ΔPtp) pressures were used to calculate the relative contribution of patient to total inspiratory lung-distending pressures (ΔPes/ΔPtp). Matching of respiratory drive indices and squaring of the PVBC was evaluated for their effect on the correlation between PVBC and ΔPes/ΔPtp. Linear regression analysis and Bland-Altman analysis were applied to compare indices. Results Using an average of five assisted breaths prior to the non-assisted breath and squaring the PVBC ( X5 PVBC 2 ) improved determination coefficients ( P <0.05), adjusted the regression slope and intercept between PVBC and ΔPes/ΔPtp toward identity ( P <0.05) and reduced bias ( P <0.05). Matching EAdi pk between non-assisted and assisted breaths within the range of 0.77 to 1.30 improved the relationship between X5 PVBC 2 and ΔPes/ΔPtp ( P <0.05) and abolished the need for EAdi normalization in the PVBC calculation ( R 2 = 0.96; bias = 0.16 ± 0.06; precision = 0.33 ± 0.08 (mean and 95% confidence interval)). Conclusions This clinical study confirms previous experimental results showing that the PVBC 2 predicts the contribution of the inspiratory muscles versus that of the ventilator during NAVA, when differences in effort (EAdi) between non-assisted and assisted breaths are limited. PVBC could help to quantify and standardize the adjustment of the level of assist, and hence reduce the risks of excessive ventilatory assist in patients. Trial registration ClinicalTrials.gov NCT01663480 . Registered 9 August 2012." @default.
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• W2171340897 date "2015-12-01" @default.
• W2171340897 modified "2023-10-16" @default.
• W2171340897 title "Assessment of patient-ventilator breath contribution during neurally adjusted ventilatory assist in patients with acute respiratory failure" @default.
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• W2171340897 doi "https://doi.org/10.1186/s13054-015-0775-2" @default.
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