Canadian Anaesthetists’ Society Journal

, Volume 19, Issue 4, pp 373–380 | Cite as

Pulmonary gas exchange: a comparison of the effects of sighs using helium and oxygen with the effects of positive expiratory pressure plateau

  • K. W. Turnbull


A comparison of periodic hyperinflations or “sighs” and positive expiratory pressure plateau (PEFP) was done in ten post-operative cardiac patients. Highly significant decreases in shunts (Qs/Qt) and highly significant increases in PaO2 occurred with PEPP. Improvement in ventilation. occurred with “sighs” but no change in oxygenation or perfusion was observed. A BIRD respirator was used and was adapted to PEPP.


Coronary Artery Bypass Graft Ventricular Septal Defect Arterial Oxygen Tension Mixed Venous Blood Venous Admixture 
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On a fait une comparaison entre ľhyperinflation périodique ou “soupirs” et le plateau de pression positive à ľexpiration (PPPE) chez dix cardiaques en pénode post-opératoire. Il y a eu une diminution importante des shunts et une augmentation importante de la PaO2 avec le PPPE. Il y a eu amélioration de la ventilation avec les “soupirs” mais on n’a observé aucun changement dans ľoxygénation ou la perfusion. On a utilisé un respirateur Bird et on ľa adapté au PPPE.


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Copyright information

© Canadian Anesthesiologists 1972

Authors and Affiliations

  • K. W. Turnbull
    • 1
  1. 1.Department of AnaesthesiaClinical Research Fellow, Pulmonary Function LaboratoryVancouver

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