“…Several studies have shown that intraoperative infusion of beta blockers, and particularly the β1-blocker, esmolol, decreases the intra- and post-operative use of opioids (Johansen et al, 1998; White et al, 2003; Chia et al, 2004; Collard et al, 2007). Moreover, beta blockers have synergistic effects with COX-2 inhibitors, preserving the immune function after surgery, and reducing the risk of postoperative metastasis in rats (Benish et al, 2008).…”