1. Nitrous oxide exposure does not seem to be associated with increased mortality, stroke, and myocardial infarction: a non-randomized subgroup analysis of the General Anaesthesia compared with Local Anaesthesia for carotid surgery (GALA) trial 
R.D. Sanders, C. Graham, S.C. Lewis, A. Bodenham, M.J. Gough, C. Warlow 
British Journal of Anaesthesia 
Volume 109, Issue 3, Pages (September 2012)
DOI: /bja/aes164
Copyright © 2012 The Author(s) Terms and Conditions

2. Fig 1
The Kaplan–Meier curve for the primary outcome (mortality, stroke, and myocardial infarction event-free) survival 1 yr after carotid endarterectomy. The log-rank test showed no difference in event-free survival at 1 yr between the two groups (P=0.21).
British Journal of Anaesthesia  , DOI: ( /bja/aes164)
Copyright © 2012 The Author(s) Terms and Conditions