Coronary graft is most commonly taken from ?
**Core Concept**
The most common coronary graft used in coronary artery bypass grafting (CABG) surgery is a bypass conduit taken from the patient's own body, specifically from the internal thoracic artery (ITA) or the saphenous vein.
**Why the Correct Answer is Right**
The ITA is preferred over the saphenous vein due to its superior long-term patency rates and resistance to atherosclerosis. The ITA is harvested from the anterior chest wall, typically between the 2nd and 6th intercostal spaces. It is then anastomosed to the coronary artery distal to the occlusion, restoring blood flow to the myocardium. The ITA's excellent growth potential and minimal risk of graft failure make it an ideal choice for coronary grafting.
**Why Each Wrong Option is Incorrect**
* **Option A:** Radial artery - While the radial artery can be used as a coronary graft, it is not the most common choice due to its smaller diameter and increased risk of spasm.
* **Option B:** Gastroepiploic artery - This artery is sometimes used as a graft for coronary artery bypass, but it is not as commonly used as the ITA or saphenous vein.
* **Option C:** Superior mesenteric artery - This artery is not typically used as a coronary graft due to its location and the risks associated with harvesting it.
**Clinical Pearl / High-Yield Fact**
The ITA is often referred to as the "gold standard" coronary graft due to its superior long-term patency rates and resistance to atherosclerosis.
**Correct Answer: C. Saphenous vein.**