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Critical Care

Open Access

The Gliding-SLICE method: an enhanced tool for estimation of intratidal respiratory mechanics

  • S Schumann1,
  • C Stahl1,
  • D Steinmann1,
  • K Möller2 and
  • J Guttmann1
Critical Care200711(Suppl 2):P204

Published: 22 March 2007


Model DataSystem MechanicRespiratory SystemMechanical ParameterVolume Range


Focusing on lung-protective ventilation, the analysis of nonlinear dynamic respiratory mechanics appears crucial. Based on the SLICE method we developed the Gliding-SLICE method as a tool to determine respiratory system mechanics. This tool was tested in a nonlinear water-filled two-chamber lung model.


The classic SLICE method [1] determines parameters of the respiratory system for abutted volume ranges. The Gliding-SLICE method enhances this method by moving a window of analysis along the volume axis. This way, a quasi-continual course of intratidal mechanics can be determined. To test the new method we build up a physical model that consists of two connected chambers filled with water. During inspiration water is displaced from one chamber to the other resulting in a counter pressure. Using wedges of certain shapes we simulated volume-dependent nonlinear compliances.


Using the Gliding-SLICE method we determined a nonlinear course of compliance in a patient (Figure 1) and in model data (Figure 2).
Figure 1

abstract P204

Figure 2

abstract P204


The Gliding-SLICE method allows one to calculate mechanical parameters of the respiratory system quasi-continually. This allows a more intuitive interpretation of data. The method is not limited to principle constrictions but can be enhanced by ventilatory maneuvers; for example, for separated view on inspiratory and expiratory respiratory mechanics.

Authors’ Affiliations

University Hospital, Freiburg, Germany
HFU, Furtwangen, Germany


  1. Guttmann , et al.: Technol Health Care. 1994, 2: 175-191.PubMedGoogle Scholar


© BioMed Central Ltd. 2007