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Sigmoidal equation for lung and chest wall volume-pressure curves in acute respiratory failure

¹Service de Réanimation Médicale et d'Assistance Respiratoire, Hôpital de la Croix-Rousse, 69004 Lyon; ²Service de Réanimation Médicale, Centre Hospitalier Lyon-Sud, 69310 Pierre Bénite, France; ³Service de Réanimation, Centre Hospitalier Saint Luc-Saint Joseph, 69007 Lyon; ⁴Service de Réanimation Polyvalente, Hopital d'instruction Des Armées, 69003 Lyon; ⁵Service de Réanimation Chirurgicale, Centre Hospitalier Lyon Sud, 69310 Pierre Bénite; and ⁶Equipe d'accueil 1896, Laboratoire de Physiologie, Claude Bernard University, 69008 Lyon, France

Submitted 17 April 2003 ; accepted in final form 13 July 2003

To assess incidence and magnitude of the "lower inflection point" of the chest wall, the sigmoidal equation was used in 36 consecutive patients intubated and mechanically ventilated with acute lung injury (ALI). They were 21 primary and 5 secondary ALI, 6 unilateral pneumonia, and 4 cardiogenic pulmonary edema. The lower inflection point was estimated as the point of maximal compliance increase. The low constant flow inflation method and esophageal pressure were used to partition the volume-pressure curves into their chest wall and lung components on zero end-expiratory pressure. The sigmoidal equation had an excellent fit with coefficients of determination >0.90 in all instances. The point of maximal compliance increase of the chest wall ranged from 0 to 8.3 cmH₂O (median 1 cmH₂O) with no difference between ALI groups. The chest wall significantly contributed to the lower inflection point of the respiratory system in eight patients only. The occurrence of a significant contribution of the chest wall to the lower inflection point of the respiratory system is lower than anticipated. The sigmoidal equation is able to determine precisely the point of the maximal compliance increase of lung and chest wall.

acute respiratory distress syndrome; mechanical ventilation; volume-pressure curves; acute lung injury

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