Fig. 4
From: Impact of prolonged assisted ventilation on diaphragmatic efficiency: NAVA versus PSV
Inspiratory pressure–time product of the diaphragm (PTP DI ) per breath (PTP DI /b) and per minute (PTP DI /min) in the two groups of patients, ventilated in neurally adjusted ventilatory assist (NAVA) or pressure support ventilation (PSV). Black bars denote PTPDI/b and PTPDI/minute measured during the three spontaneous breathing trials (SBT) (0, 24 and 48 hours). White bars denote PTPDI/b and PTPDI/min measured each 4 hours during assisted ventilation. During the assisted ventilation period both the PMUSC/b and the PMUSC/min were constantly higher in the NAVA than in the PSV group (analysis of variance model: for PDI/b, F = 32.64; p <0,001; for PMUSC/min, F = 39.15; p <0.001)