The retrospective cohort study, drawing on a national administrative claims database, included nearly 36,000 individuals who underwent coronary artery bypass graft (CABG; 71.7%) and heart valve procedures (28.3%). All patient were naive at 180 days prior to the index procedure. persistent use of opioids post-surgery occurred in 2,609 patients who underwent CABG (10.2%) and in 821 valve surgery patients (8.1%; P=0.001). While the researchers reported that the likelihood of developing dependence decreased among heart valve patients, they also reported in increase in risk for women, those younger in age, those with preoperative congestive heart failure, patients with chronic lung disease, those with diabetes, those with kidney failure, those with chronic pain, and those with alcoholism.