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Am. J. Respir. Crit. Care Med., Volume 165, Number 2, January 2002, 165-170

Recruitment Maneuvers during Lung Protective Ventilation in Acute Respiratory Distress Syndrome

ANA VILLAGRÁ, ANA OCHAGAVÍA, SARA VATUA, GASTÓN MURIAS, MARIA DEL MAR FERNÁNDEZ, JOSEFINA LOPEZ AGUILAR, RAFAEL FERNÁNDEZ, and LLUIS BLANCH

Critical Care Center, Hospital de Sabadell, Corporacio Parc Tauli, Sabadell, Spain

The objective was to analyze the physiologic effects of recruitment maneuvers (RM) in 17 patients with acute respiratory distress syndrome (ARDS) ventilated with a lung protective strategy. RM consisted of 2 min of pressure-controlled ventilation at a peak pressure of 50 cm H2O and a positive end-expiratory pressure (PEEP) above the upper inflection point of the respiratory pressure-volume curve obtained at zero PEEP. In eight patients, RM were repeated in the late phase of ARDS. Oxygenation did not change 15 min after RM in the early and late phase of ARDS. When PaO2/fraction of inspired oxygen (FIO2) increased during RM, venous admixture (Q VA/Q T) decreased. The opposite occurred in patients in whom PaO2/FIO2 decreased during RM. RM-induced changes in cardiac output were not observed. A significant correlation was found between RM-induced changes in PaO2/FIO2 during the RM and changes in respiratory system compliance at 15 min (r = 0.66, p < 0.01) and RM-induced changes in Q VA/Q T (r = -0.85; p < 0.01). The correlation between RM-induced changes in PaO2/FIO2 in responders (improvement in PaO2/FIO2 of greater than 20% during the RM) and the inspired oxygen fraction was also significant. In ARDS patients ventilated with a lung protective strategy we conclude that RM have no short-term benefit on oxygenation, and regional alveolar overdistension capable of redistributing blood flow can occur during RM.




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