| C | compliance |
| CO2 | carbon dioxide |
| HME | heat and moisture exchanger |
| ICU | intensive care unit |
| PCV | pressure-controlled ventilation |
| P alv | alveolar pressure |
| P aw | airway pressure |
| PEEP | positive end expiratory pressure |
| Pt | patient |
| R | resistance |
| RR | respiratory rate |
| τ | time constant |
| VT | tidal volume |
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