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Table 1 Requisites of the occlusion manoeuvres for P.01 measurements

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

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)