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Decrease in PaCO2 with prone position is predictive of improved outcome in acute respiratory distress syndrome.

Luciano Gattinoni1, Federica Vagginelli, Eleonora Carlesso

  • 1Istituto di Anestesia e Rianimazione, Universitá degli Studi di Milano, Ospedale Policlinico, Milan, Italy. gattinon@policlinico.mi.it

Critical Care Medicine
|December 12, 2003
PubMed
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Prone positioning improves survival in acute respiratory distress syndrome (ARDS) patients who show a reduction in partial pressure of carbon dioxide (Paco2). This indicates improved alveolar ventilation is key for surviving acute respiratory failure.

Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology
  • Pulmonary Medicine

Background:

  • Acute lung injury (ALI) and acute respiratory distress syndrome (ARDS) are critical conditions characterized by impaired gas exchange.
  • Prone positioning is a ventilatory strategy used to improve oxygenation in ALI/ARDS patients.

Purpose of the Study:

  • To investigate if improved gas exchange from prone positioning correlates with better outcomes in ALI/ARDS.
  • To identify predictors of survival in ALI/ARDS patients undergoing prone therapy.

Main Methods:

  • Retrospective analysis of 225 patients with ALI/ARDS from a randomized controlled trial and a pilot study.
  • Patients received 6 hours of prone positioning daily for 10 days, with respiratory variables measured before and after.
  • Arterial blood gas (ABO) alterations and 28-day mortality were assessed.

Related Experiment Videos

Main Results:

  • Patients who responded to prone positioning with a decrease in Paco2 had significantly improved 28-day survival (35.1% vs. 52.2%).
  • Oxygenation responders (increased Pao2/Fio2) did not show a significant difference in outcome compared to non-responders.
  • Independent risk factors for mortality included lower Pao2/Fio2 ratio, higher minute ventilation/Paco2 ratio, and elevated plasma creatinine.

Conclusions:

  • A reduction in Paco2 in response to prone positioning is a significant predictor of improved survival in ALI/ARDS.
  • Enhanced alveolar ventilation efficiency, indicated by decreased physiologic deadspace, is a crucial marker for survival in acute respiratory failure.