From: Equipment review: Measurement of occlusion pressures in critically ill patients
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) |