Table 1.
Comparison of ventilator parameters between propped-up and Trendelenburg ventilation
| Settings | Propped-up position at 30° | Trendelenburg position |
|---|---|---|
| Mode of ventilation | PCV+in Hamilton C-3 ventilators | PCV+in Hamilton C-3 ventilators |
| Inspiratory pressure (Pi) | 23 cm H2O | 23 cm H2O |
| PEEP | 7 cm H2O | 7 cm H2O |
| Others (I:E, FiO2) | 1:1, 100% | 1:1, 100% |
| TV | 210–230 mL | 300–320 mL |
| Cs | 13.7 mL/cm H2O | 19.3 mL/cm H2O |
| PaO2 | 52 mm Hg | 49 mm Hg (60 minutes post-Trendelenburg position) |
| PaCO2 | 112 mm Hg | 78 mm Hg (60 minutes post-Trendelenburg position) |
| pAO2 | 573 mm Hg | 615.5 mm Hg |
PCV, pressure-controlled ventilation; PEEP, positive end expiratory pressure; I:E, inspiratory and expiratory ratio; FiO2, fraction of inspired oxygen; TV, tidal volume; PO2, partial pressure of oxygen in arterial blood; PaCO2, partial pressure of carbon dioxide in arterial blood; Cs, static lung compliance; pAO2, alveolar oxygen tension in mm Hg