Table 2. Summary of Characteristics in Studies Included for the Meta-analysis

CABG = coronary artery bypass grafting; CPB = cardiopulmonary bypass; IV = intravenous; TD = transdermal; POD = postoperative day; −x min = clonidine administration × min before anesthesia (x = 60, 90, and 120); CK-MB = creatine kinase myocardial band.