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Different techniques for P.01 assessment
| Technique | Advantage | Disadvantage |
| `Formal' occlusion | Precise; | Complicated; |
| technique | good; | requires specific |
| repeatable | equipment and | |
| interruption of the | ||
| natural breathing | ||
| rhythm | ||
| `Quasi occlusion' | Simple; | Requires a pressure |
| technique (demand | no specific | trigger with an |
| valve) | equipment; | opening time in the |
| no interruption | demand valve | |
| of the natural | > 100 ms; | |
| breathing rhythm | can be influenced by | |
| external factors | ||
| (endotracheal tube | ||
| obstruction) |
