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Do airway secretions play an underappreciated role in acute respiratory distress syndrome?

Graf, Jerónimo; Marini, John J

Current Opinion in Critical Care: February 2008 - Volume 14 - Issue 1 - p 44–49
doi: 10.1097/MCC.0b013e3282f2f4cb
Respiratory system: Edited by Paolo Pelosi

Purpose of review We review the evidence that airway secretions may have an underappreciated role in acute respiratory distress syndrome, contributing to physiologic disarrangements, ventilator dependence and perhaps to injury generation. As common manipulations of ventilator settings, position and fluid status have the potential to influence these problems, explorations into the secretion dynamics of acute lung injury may be fertile ground for developing therapeutic advances.

Recent findings Principles that govern the interaction of airflow and airway fluids suggest that mobile fluids and secretions are pumped by well-selected ventilatory patterns toward the airway opening. Conversely, other selections may inhibit these fluids from clearance or encourage their translocation between lung regions. Recent laboratory work demonstrates that choices for tidal volume and positive end-expiratory pressure may localize or disperse proteinaceous lung edema or bacteria. Gravitational factors may interact with ventilatory pattern for benefit or harm.

Summary Capability of ventilation and positioning to mobilize secretions implies the potential for clearance or containment of inflammatory mediators and infection. Ventilatory and positional prescriptions could be designed to meet one of either conflicting targets. Additional experimental and clinical investigations are required before adopting these proposed therapeutic principles into practice.

University of Minnesota, Minneapolis/St Paul, Minnesota, USA

Correspondence to John J. Marini, MD, Professor of Medicine, Regions Hospital, Pulmonary/Critical Care, MS-11203B, 640 Jackson Street, St Paul, MN 55101, USA Tel: +1 651 254 3411; fax: +1 651 254 3098; e-mail:

© 2008 Lippincott Williams & Wilkins, Inc.