Coronary arteries revascularization surgery without artificial blood circulation

Coronary artery revascularization without cardiopulmonary bypass (commonly referred to as coronary artery bypass grafting on a beating heart or off-pump CABG) is a surgical procedure designed to treat advanced coronary artery disease. This surgical intervention is indicated for patients diagnosed with advanced atherosclerosis presenting with multivessel involvement, characterized by high-grade stenosis or complete occlusion of the coronary arteries.

What is coronary artery revascularization without cardiopulmonary bypass?

The primary objective of coronary artery bypass grafting is to restore physiological blood flow to the myocardium, ensuring adequate delivery of oxygen and nutrients, relieving chest pain (angina pectoris), and reducing the risk of myocardial infarction.

During this surgical intervention, complete myocardial revascularization is performed to re-establish perfusion across all segments of the myocardium. This comprehensive blood flow restoration represents a distinct advantage over single-vessel or partial revascularization achieved via percutaneous coronary intervention (PCI / coronary angioplasty).

At the clinic, this operation is performed without the use of a cardiopulmonary bypass machine (off-pump technique), operating directly on the beating heart using specialized myocardial tissue stabilizers. As a result, physiological recovery begins sooner, and the body experiences lower systemic inflammatory response and physiological stress compared to conventional on-pump surgery.

When is off-pump coronary artery bypass grafting performed?

The operation is performed for the following clinical conditions and indications:

• advanced coronary artery atherosclerosis: complex, multiple, or diffuse arterial narrowings;
• left main or multivessel coronary disease: significant stenosis or total occlusion of the left main coronary artery or all three major coronary vessels;
• refractory angina pectoris: chest tightness, squeezing, or pain during physical exertion or emotional stress that is not adequately controlled with pharmacological therapy;
• high risk of myocardial infarction: clinical scenarios involving imminent threat of abrupt blood flow cessation over extensive myocardial territories;
• coronary anatomy unsuitable for stenting: anatomical configurations where percutaneous angioplasty cannot provide durable, complete revascularization.

Procedure steps and postoperative physiological benefits

The procedure is conducted in a cardiac surgical operating suite under general anesthesia. The surgeon utilizes the patient's own autologous conduits (most commonly the internal mammary artery, radial artery, or great saphenous vein) to construct vascular bypasses around the obstructed coronary segments.

Following complete off-pump revascularization, the following physiological improvements are documented:

• resolution or marked reduction of chest pain (angina): restoration of myocardial perfusion and oxygenation eliminates retrosternal tightness and pressure during physical effort or stress;
• improvement in functional capacity and physical endurance: shortness of breath and rapid fatigue decrease or resolve entirely, facilitating routine daily activities, walking, and stair climbing;
• significant decrease in myocardial infarction risk: surgical bypass grafts protect myocardial tissue from acute ischemic injury and necrosis;
• extension of long-term life expectancy: clinical trials have established that complete coronary revascularization improves long-term survival, particularly in multivessel and left main disease;
• reduced requirement for cardiovascular medications: alleviation of ischemic symptoms reduces or eliminates the need for fast-acting antianginal agents (such as nitroglycerin), allowing physicians to de-escalate dosages.

Performing the operation on a beating heart without cardiopulmonary bypass lowers the incidence of postoperative systemic, neurological, renal, and hematological complications, leading to a faster initiation of rehabilitation.