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Table 2 Histology Grading

From: Endoscopic Saphenous harvesting with an Open CO2 System (ESOS) trial for coronary artery bypass grafting surgery: study protocol for a randomized controlled trial

The histological structures to be evaluated are the: The numeric grading system estimates the percent disruption of each histological structure and will be scored according to the following scale [2]:
endothelial layer 0 Intact or not disruption
elastic lamina 1 < 10%
medial smooth muscle and connective tissue 2 10-25%
adventitial connective tissue. 3 25-50%
  4 > 50%