Table 1

Comparison between elastance (E) and resistance (R) and the levels of assistance

ReferenceDiagnosisAssessment of E and RE (cm H2O/l)R (cm H2O/l/s)VA (cm H2O/l)FA (cm H2O/l/s)
VA = volume assist; FA = flow assist; ARF = acute respiratory failure; CVF = chronic ventilatory failure; COPD = chronic obstructive pulmonary disease; RCWD = restrictive chest wall disease.
Bianchi et al40Stable CVF: COPDRun away10.5 (4.6) 3.8 (1.7) 8.6 (3.6)3 (1.3)
Vitacca et al18ARF: COPDOesophageal balloon17.6 (12.4)22.4 (8)15.6 (4.9)4.4 (1.7)
Polese et al21Stable CVF: COPDOesophageal and gastric balloons15.8 (8)15 (7.6)13.9 (4.1)4.1 (1.3)
Porta et al22Stable CVF: COPDOesophageal and gastric16.4 (16.8)15.3 (7.9)12.2 (5.6)4.7 (2.7)
RCWDballoons18.2 (12.4) 8.1 (4.1)27.8 (8)6.9 (2.7)