1. Remote measurement of the leak around the uncuffed tracheal tube: objective measurement and physical characteristics 
A.J. Sims, K. Keltie, C.A. Reay, J.H. Smith 
British Journal of Anaesthesia 
Volume 108, Issue 1, Pages (January 2012)
DOI: /bja/aer367
Copyright © 2012 The Author(s) Terms and Conditions

2. Fig 1
Electrical analogue of a breathing circuit. The leak between a TT and the trachea is represented by a resistor.
British Journal of Anaesthesia  , DOI: ( /bja/aer367)
Copyright © 2012 The Author(s) Terms and Conditions

3. Fig 2
Measured pressure–flow characteristics of 10 physical models of TT–trachea interface (points). Details of each model are described in the main text. Values of a′, b′, and Q10 (derived from a′ and b′) for each model are given in Table 1. The lines are calculated from the Prony equation for volumetric flow [equation (2)] using a′ and b′ coefficients from Table 1.
British Journal of Anaesthesia  , DOI: ( /bja/aer367)
Copyright © 2012 The Author(s) Terms and Conditions

4. Fig 3
Proportion of volume lost to leak and Q10 for different values of PEEP (a), plateau pressure (b), and time spent at plateau (c). Values were measured using a ventilator and test lung with one of the leak models in a simulated breathing circuit.
British Journal of Anaesthesia  , DOI: ( /bja/aer367)
Copyright © 2012 The Author(s) Terms and Conditions

5. Fig 4
Relationship between LC, represented by Q10 (flow through leak litre min at a lung pressure of 10 cm H2O), and proportion of volume lost to leak for 130 patients.
British Journal of Anaesthesia  , DOI: ( /bja/aer367)
Copyright © 2012 The Author(s) Terms and Conditions

6. Fig 5
Relationship between volume lost to leak and time-integrated lung pressure signal per breath. Values represent clinical data obtained from patients with Q10 in the 0.3–0.4 range (a) and the 0.4–0.6 range (b).
British Journal of Anaesthesia  , DOI: ( /bja/aer367)
Copyright © 2012 The Author(s) Terms and Conditions