1. Adenosine-enhanced ischemic preconditioning provides myocardial protection equal to that of cold blood cardioplegia 
James D McCully, PhD, Masahisa Uematsu, MD, Sidney Levitsky, MD 
The Annals of Thoracic Surgery 
Volume 67, Issue 3, Pages (March 1999)
DOI: /S (98)01371-X

2. Fig 1
Effects of adenosine-enhanced ischemic preconditioning (APC), cold blood cardioplegia (CBC), and ischemic preconditioning (IPC) on infarct size (percent of left ventricular volume) after 30 minutes of hypothermic global ischemia and 120 minutes of reperfusion. Results are shown as mean ± standard error of the mean for n = 6 to 9 for each group. Asterisk indicates significant differences at p < 0.05 versus APC and CBC hearts. There was no significant difference between APC and CBC hearts.
The Annals of Thoracic Surgery  , DOI: ( /S (98)01371-X)