There are more than a dozen distinct types of heart surgery, but they fall into six major categories: coronary artery bypass, valve repair or replacement, aortic aneurysm repair, arrhythmia correction, device implantation, and heart transplant. More than one million cardiac surgical procedures are performed worldwide each year, with bypass and valve surgeries making up the largest share. Here’s what each type involves and who it’s for.
Coronary Artery Bypass Grafting (CABG)
Bypass surgery is the single most common heart operation. In high-income countries, roughly 37 out of every 100,000 people undergo it each year. The goal is straightforward: when one or more arteries feeding the heart are blocked by plaque, a surgeon creates a detour using a healthy blood vessel taken from your chest, leg, or arm. Blood flows through the new route, bypassing the blockage entirely.
Not all bypass surgeries look the same. The four main approaches are:
- Traditional (on-pump) CABG. The chest is opened through the breastbone, and a machine temporarily takes over pumping blood while the surgeon works. This is the most common method.
- Off-pump CABG. The chest is still opened, but the heart keeps beating on its own throughout the procedure. No heart-lung machine is used.
- Minimally invasive CABG. Small incisions are made between the ribs instead of splitting the breastbone. Recovery is faster.
- Robotic-assisted CABG. A form of minimally invasive surgery where the surgeon controls robotic arms from a console, using a magnified 3D view of the surgical site for extreme precision.
After traditional bypass surgery, expect about a week in the hospital and 6 to 12 weeks of recovery at home. Minimally invasive approaches shorten that timeline, though the exact difference depends on the number of bypasses performed and your overall health.
Heart Valve Repair and Replacement
Valve surgery is the second most common category, performed at a rate of about 31 per 100,000 people per year in high-income countries. The heart has four valves that keep blood flowing in the right direction. When a valve stiffens, leaks, or narrows, a surgeon can either fix the existing valve or swap it for an artificial one. The aortic valve and mitral valve are the ones most frequently treated.
Repair techniques vary depending on what’s wrong. A surgeon might separate valve flaps that have fused together, patch torn flaps, or place a supportive ring around the valve opening to restore its shape. If repair isn’t possible, the valve is removed and replaced with either a mechanical valve (made of carbon-coated plastic) or a tissue valve (made from animal tissue or a human donor valve). Mechanical valves last longer but require lifelong blood-thinning medication. Tissue valves eventually wear out but don’t carry the same medication burden.
Some valve replacements can now be done through a catheter threaded into the heart from a blood vessel in the groin, avoiding open-chest surgery entirely. This catheter-based approach has become standard for many patients, particularly older adults who face higher risk from traditional surgery.
Aortic Aneurysm Repair
When a section of the aorta, the body’s largest artery, balloons outward due to a weakened wall, it creates an aneurysm. Left untreated, the aneurysm can rupture. There are two surgical options.
Open repair involves a long incision along the side of the chest. The surgeon clamps the aorta above and below the damaged section, cuts out the weakened portion, and sews in a synthetic fabric graft that becomes the new wall of the artery. It’s a major operation with a significant recovery period.
The minimally invasive alternative is endovascular repair. Instead of opening the chest, the surgeon inserts a thin tube through an artery in the groin and guides it up to the aneurysm using X-ray imaging. A mesh stent is deployed inside the weakened section, reinforcing the artery wall from the inside. Hospital stays and recovery times are considerably shorter with this approach, though not every aneurysm is shaped or located in a way that allows it.
Arrhythmia Surgery
When the heart beats in a dangerously irregular rhythm and medications or catheter procedures haven’t worked, surgery can physically interrupt the faulty electrical signals causing the problem.
The most established procedure is the maze surgery, designed specifically for atrial fibrillation, the most common type of abnormal heart rhythm. A surgeon uses freezing or radiofrequency energy to create a precise pattern of tiny scars on the heart’s upper chambers. These scars form barriers that block chaotic electrical signals while still allowing normal signals to pass through. The success rate for this procedure is 80 to 90%, though some patients need an additional catheter-based procedure afterward to fully eliminate the arrhythmia.
The maze procedure can be performed through a full chest opening or through smaller incisions between the ribs. It’s often done at the same time as another heart surgery, such as valve repair, rather than as a standalone operation.
Device Implantation
Two major devices are surgically placed inside the body to manage serious heart conditions.
An implantable defibrillator is a small device placed under the skin, connected to the heart by wires. It continuously monitors heart rhythm and delivers an electrical shock if it detects a life-threatening irregular beat, essentially restarting normal rhythm within seconds. Placement is typically less invasive than open-heart surgery.
A ventricular assist device (VAD) is a mechanical pump implanted in the heart itself, most often in the left ventricle, the heart’s main pumping chamber. It helps a weakened heart push blood to the rest of the body. VAD implantation requires open-heart surgery and is used in three situations: as a temporary bridge while waiting for a heart transplant, as support while the heart recovers from a reversible condition, or as a permanent solution for people who aren’t candidates for transplant. That last use, called destination therapy, means living with the device indefinitely.
Heart Transplant
A transplant replaces a failing heart with a healthy one from a deceased donor. It’s reserved for end-stage heart failure, when no other treatment can restore adequate heart function. The surgery itself takes several hours, and the recovery process involves close monitoring for organ rejection, which requires lifelong immune-suppressing medication. Many transplant patients return to active daily life, but the limited supply of donor hearts means long wait times are common, which is one reason VADs play such an important role as a bridge.
Open-Heart vs. Minimally Invasive Approaches
Across nearly every category of heart surgery, there’s a trend toward smaller incisions and less invasive techniques. Traditional open-heart surgery involves splitting the breastbone and opening the chest wide, giving the surgeon a direct view of the heart. It remains essential for complex cases, but it comes with longer hospital stays and a recovery period that stretches into months.
Minimally invasive options, whether catheter-based, thoracoscopic (through small incisions between the ribs), or robotic-assisted, aim to achieve the same result with less physical trauma. In robotic surgery, the surgeon sits at a console and controls instruments attached to robotic arms. The system translates hand and foot movements into precise actions inside the chest, guided by a magnified 3D camera view. The robot doesn’t operate independently. It’s a tool that extends the surgeon’s reach and steadiness.
The trade-off is that not every patient or condition qualifies for a minimally invasive approach. The anatomy of your heart, the complexity of the problem, and whether you’ve had previous heart surgery all influence which method your surgical team recommends.