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Table 1 Potential added values of two newly available tools in bedside monitoring*

From: Two steps forward in bedside monitoring of lung mechanics: transpulmonary pressure and lung volume

Transpulmonary pressure Functional residual capacity
Non-invasively estimates lung-distending pressure Non-invasively estimates 'functional' lung size, which refines compliance and resistance calculations
Samples 'local' (but potentially critical) dependent zones of the lungs Helps monitor disease progression and resolution
Presents a new approach for setting 'effective' PEEP level in ALI/ARDS patients Allows assessment of the impact of common interventions: PEEP and positioning
Offers the potential for monitoring 'true' driving pressures across the lung (tidal changes in PTP), despite abnormalities of the chest wall and effort Complements PTP in the setting of non-symmetrical lung and chest wall diseases (e.g., atelectasis, effusion, etc.)
  Optimizes lung-protection strategy by determining the size of the 'baby lung', allowing for calculation of the 'strain ratio'
  1. *see text for limitations. ALI: Acute lung injury; ARDS: Acute respiratory distress syndrome; PTP: Transpulmonary pressure; PEEP: Positive end-expiratory pressure.