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Table 4 Inspiratory muscle effort during the five different weaning tests and 20 minutes after extubation

From: Spontaneous breathing trial and post-extubation work of breathing in morbidly obese critically ill patients

  PSV PSV PSV PSV T piece After extubation
+7 cmH2O PEEP 0 cmH2O PEEP +7 cmH2O PEEP 0 cmH2O PEEP
+7 cmH2O +7 cmH2O 0 cmH2O 0 cmH2O
Swing Pes, cmH2O 7.2 ± 5.0* 13.4 ± 5.5* 12.3 ± 6.3* 19.1 ± 7.7 19.8 ± 7 19.1 ± 5.4
Swing Pdi, cmH2O 8.4 ± 5.5* 15.4 ± 5.7* 14.2 ± 6.4* 21.2 ± 8.1 21.7 ± 7.0 20.9 ± 5.5
PTP es, cmH2O.s/minute 141 ± 54* 259 ± 84* 231 ± 82* 346 ± 97 332.9 ± 85.9 365 ± 87
PTP di, cmH2O.s/minute 157 ± 80* 318 ± 113* 302 ± 111* 451 ± 151 439 ± 152 465 ± 117
WOB, J/L 0.69 ± 0.31* 1.15 ± 0.39* 1.09 ± 0.49* 1.58 ± 0.57 1.57 ± 0.56 1.56 ± 0.5
WOB, J/minute 7.15 ± 3.5* 12.2 ± 6.8* 12.4 ± 7.1* 17.7 ± 10.2 16.8 ± 8.0 17.8 ± 9.1
  1. Abbreviations: Pdi trans-diaphragmatic pressure, PEEP positive end-expiratory pressure, Pes esophageal pressure, PTPdi trans-diaphragmatic pressure time product, PTPes esophageal pressure time product, PSV pressure support ventilation, WOB work of breathing. *p < 0.001 when compared with after extubation