Exsufflation pressures

Gomez-Merino E, Sancho J, Marin J, et al. Mechanical insufflation-exsufflation pressure, volume, and flow relationships and the adequacy of the manufacturer s guidelines. Am J Phys... 

Mechanical insufflator-exsufflators (Cough-Assist, J. H. Emerson Co., Cambridge, Massachusettes, U.S.A.) deliver deep insufflations (at positive pressures of 30 to 50 cmH20) followed immediately by deep exsufflations (at negative pressures of -30 to -50 cmH20). The insufflation and exsufflation pressures and delivery times are independently adjustable (71). With an inspiratory time of two seconds and an expiratory time of three seconds, there exists a very good correlation between the pressures used and the flows obtained (72). 

Beck GJ, Scarrone LA. Physiological effects of exsufflation with negative pressure (E.W.N.P.). Dis Chest 1956 29(1) 1-16. 

Baraeh AL, GJ Beek. Exsufflation with negative pressure physiologic and clinical studies in poliomyelitis, bronehial asthma, pulmonary emphysema and bronchiectasis. Arch Intern Med 1954 93(6) 825-841. 

Williams EK, Holaday DA. The use of exsufflation with negative pressure in postoperative patients. Am J Surg 1955 90(4) 637-640. 

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