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. 1998 Jan 22;1(3):89–93. doi: 10.1186/cc110

Table 1.

Requisites of the occlusion manoeuvres for P.01 measurements

Noise-free
Not perceivable by the patient
Rapid (Hans Rudolf valve or balloon system)
High speed paper recording (> 20 mm/s)
Preferably in intubated or tracheostomized patients (oropharynx compliance can alter the value)