1. Acute effects of fentanyl on breathing pattern in anaesthetized subjects 
L.M. Ferguson, G.B. Drummond 
British Journal of Anaesthesia 
Volume 96, Issue 3, Pages (March 2006)
DOI: /bja/ael011
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

2. Fig 1
The breathing system used. The fresh gas flow was set at 15 litre min−1.
British Journal of Anaesthesia  , DOI: ( /bja/ael011)
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

3. Fig 2
Changes in (a) end-tidal partial pressure of carbon dioxide and (b) end-tidal concentration of sevoflurane after drug administration.
British Journal of Anaesthesia  , DOI: ( /bja/ael011)
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

4. Fig 3
Effects of fentanyl 0.5 μg kg−1 on breathing pattern. The values of duration of inspiration (T1), expiration (TE) and tidal volume (VT) increased significantly (all P<0.01, Friedman test).
British Journal of Anaesthesia  , DOI: ( /bja/ael011)
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

5. Fig 4
Summary spirogram of the effects of fentanyl on the breathing pattern.
British Journal of Anaesthesia  , DOI: ( /bja/ael011)
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

6. Fig 5
The inspiratory flow patterns of the individual subjects, before (dotted line) and 240 s after (continuous line) fentanyl. In all subjects the initial rate of increase of flow rate was reduced.
British Journal of Anaesthesia  , DOI: ( /bja/ael011)
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

7. Fig 6
Individual changes in the relationship between tidal volume and duration of inspiration. The filled symbol represents the control condition, and the line represents the changes after fentanyl. In one subject, a reciprocal relationship was evident: in the other subjects there was either little change or a proportional change in both values (a positive slope of the plot).
British Journal of Anaesthesia  , DOI: ( /bja/ael011)
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions