1. Small dose of clonidine mixed with low-dose ropivacaine and fentanyl for epidural analgesia after total knee arthroplasty† 
Förster J.G. , Rosenberg P.H.  
British Journal of Anaesthesia 
Volume 93, Issue 5, Pages (November 2004)
DOI: /bja/aeh259
Copyright © 2004 British Journal of Anaesthesia Terms and Conditions

2. Fig 1
Total amounts of i.m. oxycodone each patient received during the study period. Group RF without, Group RFC with clonidine. There is a statistically significant difference between the groups (MW-U, P=0.027), with smaller i.m. oxycodone requirements in Group RFC.
British Journal of Anaesthesia  , DOI: ( /bja/aeh259)
Copyright © 2004 British Journal of Anaesthesia Terms and Conditions

3. Fig 2
(a) Mean arterial pressure (MAP) and (b) heart rate (HR) at the four interview times. Group RF without, Group RFC with clonidine. Times of predetermined interviews: 18:00 and 24:00 on the day of surgery, 06:00 and 12:00 on the first postoperative day. Symbols are mean (sd). With regard to MAP, there is a statistically significant difference between the groups (RM anova, F=10.5, P<0.002).
British Journal of Anaesthesia  , DOI: ( /bja/aeh259)
Copyright © 2004 British Journal of Anaesthesia Terms and Conditions