Heart Bypass Surgery (CABG)

Coronary Artery Bypass Grafting (CABG)

Coronary Artery Bypass Grafting (CABG), commonly called "heart bypass surgery," is a major surgical procedure used to treat severe coronary artery disease. It creates new pathways for blood to flow to the heart muscle by bypassing clogged or narrowed sections of the coronary arteries. By using healthy blood vessels from elsewhere in the body to "reroute" blood, CABG restores vital oxygen supply to the heart muscle and reduces the risk of a heart attack.

When You Should Consider CABG

• Left Main Disease: A severe blockage in the main artery supplying the left side of the heart, which is considered high-risk.

• Triple Vessel Disease: Significant blockages in all three major coronary arteries.

• Diabetes: Patients with diabetes and multi-vessel disease often have better long-term outcomes with surgery than with stenting.

• Complex Anatomy: Blockages that are too long, heavily calcified (hardened), or located in areas where a stent cannot be safely placed.

• Failed Angioplasty: When previous attempts to open arteries with balloons or stents have not been successful or the artery has narrowed again.

Surgical Techniques

• On-Pump CABG: The traditional method where a heart-lung bypass machine takes over the work of the heart and lungs, allowing the surgeon to operate on a still, non-beating heart.

• Off-Pump (Beating Heart) CABG: The surgeon uses specialized stabilizers to operate while the heart continues to beat, avoiding the bypass machine. This is often preferred for patients at high risk for stroke.

• Minimally Invasive (MIDCAB): Small incisions are made between the ribs rather than through the breastbone. This is typically used for bypassing one or two arteries on the front of the heart.

• Endoscopic Vessel Harvesting (EVH): A 2026 standard where grafts from the leg or arm are removed through tiny incisions using a camera, reducing scarring and pain.

How CABG Is Performed

• Incision: A midline incision is made, and the breastbone (sternum) is divided to access the heart.

• Harvesting: Simultaneously, healthy vessels are harvested: the Internal Mammary Artery (chest), Saphenous Vein (leg), or Radial Artery (arm).

• Bypass: One end of the graft is attached to the aorta (the main artery) and the other end below the blockage, creating a permanent "detour."

• Restarting: Once the connections are tested for leaks, the heart is restarted (if it was stopped), and the bypass machine is disconnected.

• Closing: The sternum is secured with permanent stainless steel wires, and the skin is closed with stitches or staples.

Pre-Procedure Preparation

• Fasting for at least 8–12 hours before surgery, as it is performed under general anesthesia.

• Extensive blood work, chest X-rays, and an ECG to ensure you are fit for major surgery.

• Dental clearance is often required to ensure no hidden infections could travel to the heart.

• Stopping or adjusting certain medications, especially blood thinners like Clopidogrel or Aspirin, as directed.

• Shaving and surgical scrubbing of the chest, legs, and arms to prevent infection.

Tests Before CABG

• Coronary Angiogram: The "roadmap" that shows exactly where the blockages are located.

• Echocardiogram: To assess the heart's pumping strength (Ejection Fraction) and valve function.

• Carotid Doppler: To check for blockages in the neck arteries that might increase the risk of stroke during surgery.

• Pulmonary Function Test (PFT): To ensure the lungs are strong enough to handle anesthesia and recovery.

• Vein Mapping: Ultrasound of the legs or arms to ensure the vessels are healthy enough to be used as grafts.

Life After CABG

• ICU Stay: Expect to spend the first 24 hours in the Intensive Care Unit for close monitoring of heart rhythm and blood pressure.

• Hospital Stay: Total recovery in the hospital usually lasts 5 to 7 days.

• Sternal Precautions: For the first 6 weeks, you must avoid lifting anything heavier than 2–3 kg to allow the breastbone to heal properly.

• Cardiac Rehabilitation: Starting around week 6, supervised exercise programs are highly recommended to rebuild strength.

• Long-term Meds: You will likely remain on Aspirin and cholesterol-lowering medications (statins) indefinitely to keep the new grafts clear.

Benefits of CABG

• Superior Longevity: Provides a long-term solution for complex multi-vessel disease, often outlasting stents.

• Symptom Relief: Significant reduction or total elimination of chest pain (angina) and shortness of breath.

• Reduced Heart Attack Risk: By restoring blood flow to large areas of the heart, the risk of a future major cardiac event is lowered.

• Improved Quality of Life: Most patients return to an active lifestyle and can exercise more effectively than before surgery.

• 2026 Success Rates: Elective CABG has a high survival rate (approx. 98–99%) due to advanced surgical and anesthesia protocols.