Coronary Artery Disease Clinical Trial
Official title:
The Effect of Melatonin on the Outcomes of Myocardial Ischemia/Reperfusion Injury During Coronary Artery Bypass Grafting Surgery
The ischemia/reperfusion (I/R) injury of the myocardium initiates a variety and complex sets of inflammatory reactions that may both exaggerate local injury as well as provoke injury of distant organ function . I/R injuries are the main causes of heart failure, morbidity, and mortality after cardiac surgery such as coronary artery bypass graft (CABG surgery) . The reactive oxygen species are believed to be excessively elevated during coronary artery bypass surgery (CABG) due to compromised free radical scavenging mechanism in the myocardium that can make myocardium highly susceptible to oxidative stress and inflammation and result in reperfusion injury . Melatonin and its metabolites protect against inflammation by regulating several inflammatory cytokines. Additionally, melatonin is a free radical scavenger and an antioxidant agent. the current study is designed to investigate the protective effects of melatonin against myocardial I/R injury in patients undergoing coronary artery bypass grafting (CABG) surgery.
Myocardial ischemia is a situation where there is an inadequate blood and oxygen supply to the heart muscles due to partial or complete obstruction of the coronary arteries, predisposing the affected cardiac muscle to death. Hence, restoration of blood supply is critical to reestablish myocardial reperfusion. The ischemia/reperfusion (I/R) injury of the myocardium initiates a variety and complex sets of inflammatory reactions that may both exaggerate local injury as well as provoke injury of distant organ function . I/R injuries are the main causes of heart failure, morbidity, and mortality after cardiac surgery such as coronary artery bypass graft (CABG surgery) . The reactive oxygen species are believed to be excessively elevated during coronary artery bypass surgery (CABG) due to compromised free radical scavenging mechanism in the myocardium that can make myocardium highly susceptible to oxidative stress and inflammation and result in reperfusion injury . Strategies to improve the CABG related complications are much needed to augment the positive outcomes in the post-operative surviving patients. There are various therapeutic approaches to decrease or ameliorate myocardial I/R injury, these include reperfusion controlling, cardioprotective events and management via various interventions. Melatonin (N-acetyl 5-methoxy-tryptamine) is mainly secreted by the pineal gland to regulate sleep. Since 1993 when melatonin was first reported, a wide range of melatonin functions have been directly confirmed by multiple scientific studies . Melatonin and its metabolites protect against inflammation by regulating several inflammatory cytokines. Additionally, melatonin is a free radical scavenger and an antioxidant agent. Early studies have shown that melatonin exerts beneficial effects in the context of renal I/R, myocardial I/R, and hepatic I/R. The ability to protect against I/R injury may relate to the functions of melatonin as both an anti-inflammatory and an antioxidant agent . Some authors show an anti-apoptotic action of melatonin in different organs of the body, such as thymus, kidney, brain and liver . the current study is designed to investigate the protective effects of melatonin against myocardial I/R injury in patients undergoing coronary artery bypass grafting (CABG) surgery. ;
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