Bypass Surgery (CABG) in Hyderabad

What is CABG Bypass Surgery?

In coronary artery disease, fatty plaques block one or more coronary arteries, reducing blood flow to the heart. When blockages are too complex or extensive for angioplasty, or when clinical evidence supports better long-term outcomes with surgery, CABG is the treatment of choice.

The surgeon harvests a segment of healthy blood vessel (the graft) from another part of the body and uses it to create a new route for blood to travel around the blockage. Blood flows through this bypass graft from the aorta directly to the coronary artery beyond the blockage, bypassing the narrowed segment entirely. The original blocked artery remains in place; the graft simply provides an alternative pathway.

The number of bypass grafts performed in one operation depends on the number of significantly blocked arteries. Single bypass (one blocked artery), double bypass (two), triple bypass (three), and quadruple bypass (four or more) are all performed routinely, with no meaningful increase in risk for additional grafts when the surgical team is experienced.

When is CABG Recommended Over Angioplasty?

Three-vessel coronary disease

Significant blockages in all three major coronary arteries. Large clinical trials (SYNTAX, FREEDOM) consistently show superior long-term outcomes with CABG over angioplasty in this pattern.

Left main artery disease

The left main coronary artery supplies over 70% of the heart's blood supply. Blockages here are particularly high-risk. CABG provides more durable protection than stenting for left main disease in most anatomical patterns.

Diabetes with multi-vessel disease

The FREEDOM trial specifically demonstrated that diabetic patients with multi-vessel disease have significantly lower rates of death, heart attack, and repeat procedures with CABG compared to drug-eluting stents.

Complex disease unsuitable for stenting

Heavily calcified arteries, long diffuse disease, or small vessel anatomy that cannot be adequately stented are well treated surgically.

Combined with other cardiac surgery

If a patient needs valve replacement or repair at the same time as coronary treatment, CABG allows both to be addressed in a single operation.

Prior failed angioplasty

Patients who have had multiple restenoses (re-narrowing) inside stents, known as in-stent restenosis, often achieve more durable results with bypass surgery.

Types of Bypass Graft Used

Internal Mammary Artery (LIMA/RIMA)

The gold standard graft. Arteries from inside the chest wall, left (LIMA) and right (RIMA). LIMA to the left anterior descending artery (LAD) has a greater than 95% patency (openness) at 10 years and is used in virtually all CABG operations. Bilateral IMA grafting (both LIMA and RIMA) improves long-term outcomes further, particularly in younger patients.

Radial Artery

The artery from the non-dominant forearm. Excellent long-term patency approaching that of IMA grafts. Preferred over saphenous vein for the second and third grafts when bilateral IMA is not used.

Saphenous Vein Graft

A segment of vein from the leg. Technically easier to harvest and has been used for decades. Vein grafts have lower long-term patency than arterial grafts, with around 50% remaining open at 10 years. Still widely used when multiple grafts are required.

The CABG Procedure: Step by Step

Pre-operative Assessment:

Full cardiac workup including coronary angiography, 2D echocardiography, pulmonary function tests, and comprehensive blood panel. Medications including blood thinners are adjusted in the days before surgery.

Anesthesia:

General anesthesia is administered. The patient is fully asleep throughout the procedure.

Chest Opening:

In conventional CABG, the sternum (breastbone) is divided (sternotomy) to access the heart. In minimally invasive approaches, smaller incisions are used.

Cardiopulmonary Bypass:

In on-pump CABG, the heart is temporarily stopped and a heart-lung bypass machine maintains circulation and oxygenation. This gives the surgeon a still, bloodless field to sew the grafts with precision. In off-pump (beating heart) CABG, grafts are sewn while the heart continues to beat with the assistance of stabilizing devices.

Graft Harvesting:

The IMA, radial artery, or saphenous vein is harvested by a second surgeon simultaneously, reducing overall operative time.

Graft Anastomosis:

Each graft is sewn from the aorta to the coronary artery beyond the blockage using extremely fine sutures under magnification. The precision of these connections directly determines long-term graft function.

Weaning from Bypass:

The heart is restarted and its function assessed before the bypass machine is discontinued.

Closure:

The sternum is wired together and the chest is closed. Drainage tubes are placed temporarily.

Cardiac ICU:

The patient is transferred to the cardiac ICU for the first 12 to 24 hours of closely monitored recovery.

A typical three-vessel CABG takes 3 to 5 hours. Operative time varies with the number of grafts, surgical approach, and patient complexity.

On-Pump vs Off-Pump CABG

On-Pump CABG (Conventional)

The heart is stopped and a bypass machine maintains circulation. Provides the best surgical field for complex multi-vessel grafting. The large majority of CABG worldwide is performed on-pump. Appropriate for most patients.

Off-Pump CABG (Beating Heart Surgery)

Grafts are sewn while the heart continues to beat using mechanical stabilizers to hold the target area still. Avoids the bypass machine. May reduce certain complications in high-risk patients (elderly, poor kidney function, stroke history). Technically more demanding.

Minimally Invasive Direct CABG (MIDCAB)

A smaller incision between the ribs is used to bypass the front of the heart (LAD artery) without sternotomy. Suitable for single-vessel disease of the LAD. Recovery is significantly faster than conventional CABG.

Recovery After Bypass Surgery

Cardiac ICU

12 to 24 hours post-surgery for continuous monitoring.

Hospital Stay

Typically 5 to 7 days for uncomplicated CABG.

Return to Light Activity

Walking encouraged from day 2 to 3. Gentle activity increases daily.

Sternal Healing

The sternum takes 6 to 8 weeks to fully heal. Lifting restrictions apply during this period.

Return to Office Work

Desk work: 4 to 6 weeks. Manual or physically demanding work: 8 to 12 weeks.

Driving

6 weeks post-operatively for conventional CABG (sternal precautions).

Cardiac Rehabilitation

Strongly recommended. Structured rehab after CABG reduces mortality by approximately 30% over 5 years.

Medications

Aspirin lifelong. Statin. Beta-blocker. ACE inhibitor. Medications tailored to individual cardiac risk profile.

Follow-up

Cardiology and surgical review at 4 to 6 weeks, then 6-monthly for the first two years.

Germanten's cardiac rehabilitation programme is available to all CABG patients and significantly accelerates functional recovery while reducing long-term cardiac risk.