Aortocoronary – Definition and Bypass Surgery
Aortocoronary refers to the connection between the aorta and the coronary arteries, especially in the context of aortocoronary bypass surgery.
Things worth knowing about "Aortocoronary"
Aortocoronary refers to the connection between the aorta and the coronary arteries, especially in the context of aortocoronary bypass surgery.
What Does Aortocoronary Mean?
The term aortocoronary combines the words aorta (the main artery of the body) and coronary artery (the blood vessels supplying the heart muscle). It describes anatomical or surgical connections between the aorta and the coronary arteries. In clinical practice, the term is most commonly used in reference to the aortocoronary bypass (ACB), one of the most frequently performed cardiac surgical procedures worldwide.
Anatomical Background
The coronary arteries originate directly from the aorta and supply the heart muscle with oxygen-rich blood. There are two main coronary arteries:
- Left coronary artery (LCA): supplies the majority of the left heart
- Right coronary artery (RCA): supplies the right heart muscle and parts of the posterior heart wall
When these vessels become narrowed or blocked due to deposits (atherosclerosis), the heart muscle can no longer receive sufficient blood, potentially leading to angina pectoris or a heart attack.
The Aortocoronary Bypass
The aortocoronary bypass procedure (ACB surgery) is a cardiac surgical technique in which narrowed or blocked coronary arteries are bypassed using new vascular connections. A graft vessel (the bypass) is sewn between the aorta and the coronary artery beyond the point of narrowing, restoring blood flow to the heart muscle.
Vessels Used as Grafts
Various vessels from the patient's own body are used as bypass grafts:
- Internal thoracic artery (mammary artery): preferred graft due to excellent long-term patency
- Great saphenous vein: leg vein, frequently used in multi-vessel bypass surgery
- Radial artery: forearm artery, also a suitable option
Indications
Aortocoronary bypass surgery is generally recommended for:
- Significant narrowing of multiple coronary vessels (multivessel coronary artery disease)
- Narrowing of the left main coronary artery
- Insufficient response to medication or percutaneous coronary intervention (PTCA/stenting)
- Severely reduced cardiac pump function combined with coronary stenoses
Surgical Procedure
The operation is performed under general anesthesia and may take several hours depending on the number of bypasses required. Traditionally, the procedure is carried out using the heart-lung machine (cardiopulmonary bypass), which takes over cardiac function during surgery. In selected cases, an off-pump bypass on a beating heart is also possible.
Risks and Complications
As with any major surgical procedure, aortocoronary bypass surgery carries certain risks:
- Bleeding and infection
- Cardiac arrhythmias (e.g., atrial fibrillation)
- Stroke
- Kidney dysfunction
- Sternal wound infections
In specialized centers, the mortality rate for elective procedures is low, typically below 2%.
Outcomes and Prognosis
Aortocoronary bypass surgery demonstrably improves quality of life in suitable patients, reduces symptoms such as angina pectoris, and prolongs life expectancy in certain patient groups. Long-term graft patency varies depending on the vessel used: arterial grafts (especially the internal thoracic artery) show patency rates above 90% at 10 years, while venous grafts achieve approximately 50-60% patency at 10 years.
References
- Neumann F-J. et al. - 2018 ESC/EACTS Guidelines on myocardial revascularization. European Heart Journal, 2019; 40(2):87-165.
- Bojar R.M. - Manual of Perioperative Care in Adult Cardiac Surgery. 5th edition, Wiley-Blackwell, 2011.
- Loop F.D. et al. - Influence of the internal-mammary-artery graft on 10-year survival and other cardiac events. New England Journal of Medicine, 1986; 314(1):1-6.
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