A MitraClip is a small device used to repair a leaking mitral valve without open-heart surgery. Instead of cutting through the chest, a cardiologist threads the clip through a vein in the leg and guides it to the heart, where it clamps the two leaflets of the mitral valve together to reduce the backward flow of blood. The procedure is primarily offered to people whose mitral valve leak is severe enough to cause heart failure symptoms but who are too high-risk for traditional surgery.
How the Mitral Valve Works and Why It Leaks
The mitral valve sits between the two left chambers of your heart. It opens to let oxygen-rich blood flow from the upper chamber (left atrium) into the lower pumping chamber (left ventricle), then snaps shut so blood moves forward into the body. When the valve doesn’t close properly, blood leaks backward with every heartbeat. This is called mitral regurgitation.
There are two main reasons the valve leaks. In primary mitral regurgitation, the valve itself is damaged: the leaflets may be floppy, thickened, or torn. In secondary mitral regurgitation, the valve structure is fine, but the heart muscle around it has stretched or weakened (often from heart failure or a heart attack), pulling the leaflets apart so they can’t seal. The MitraClip can treat both types, though the clinical evidence and guidelines differ slightly depending on the cause.
How the Procedure Works
The MitraClip procedure has four main steps: gaining access to a vein, crossing into the left side of the heart, placing the clip, and closing the access site. The entire process is done in a catheterization lab, not an operating room, and you’re under general anesthesia throughout.
A cardiologist starts by inserting a catheter into the femoral vein in the groin. From there, the catheter is advanced up into the right side of the heart. To reach the mitral valve on the left side, the team performs a transseptal puncture, passing a thin needle through the wall that separates the two upper chambers. Once across, the clip delivery system is guided down to the mitral valve.
The clip itself works like a clothespin. It grasps the edges of the two valve leaflets and holds them together in the middle, creating a double opening for blood to flow through while preventing the backward leak. If a single clip doesn’t reduce the leak enough, additional clips can be placed during the same procedure. Throughout every step, the team relies on transesophageal echocardiography (an ultrasound probe positioned in the esophagus behind the heart) to visualize the valve in real time, confirm the leaflets are properly captured, and assess whether the leak has been adequately reduced.
Who Is a Candidate
The MitraClip is not a first-line treatment. Current guidelines reserve it for people with severe mitral regurgitation who are at high or prohibitive surgical risk, meaning traditional open-heart valve repair or replacement would carry unacceptable danger due to age, frailty, or other medical conditions. A multidisciplinary heart team, typically including interventional cardiologists, cardiac surgeons, and imaging specialists, evaluates each patient before the procedure is approved.
For secondary mitral regurgitation, candidates generally need to have a heart pumping strength (ejection fraction) between 20% and 50%, and they must still be severely symptomatic despite being on the best available heart failure medications. Patients whose hearts are too weak or too enlarged may not benefit.
What the Evidence Shows
The strongest evidence for MitraClip comes from the COAPT trial, which followed patients with secondary mitral regurgitation for five years. Compared to medications alone, adding the MitraClip cut the annual rate of heart failure hospitalizations nearly in half: 33.1% per year in the device group versus 57.2% in the medication-only group. Five-year mortality was also lower, at 57.3% with the clip compared to 67.2% without it. The combined risk of death or hospitalization within five years dropped from 91.5% with medication alone to 73.6% with the device.
These are patients with serious, advanced heart failure, so the overall numbers remain high in both groups. But the relative improvement is substantial. Beyond survival data, about half of patients with severe heart failure symptoms experienced at least a one-class improvement in functional capacity after the procedure, meaning activities like walking or climbing stairs became noticeably easier. Roughly one in four improved by two classes.
Risks and Complications
Because the MitraClip avoids opening the chest, the complication profile is considerably lighter than open-heart surgery, but it’s not risk-free.
- Clip detachment from one leaflet: Earlier versions of the device saw this in up to 11% of cases. With newer-generation clips and more experienced operators, the rate has dropped to under 2%.
- Stroke: Occurs in 0% to 1% of procedures.
- Bleeding: Severe bleeding requiring a transfusion is reported in up to 17% of cases, though fewer than half of bleeding events are related to the groin access site. Other causes include blood thinners used during the procedure.
- Vascular complications at the access site: Major complications occur in roughly 1.4% to 4% of cases, with minor ones in about 3% to 4%.
In rare cases, the clip may not reduce the leak enough, and a second procedure or eventual surgery may be needed.
Recovery and What to Expect Afterward
Hospital stays after a MitraClip are significantly shorter than after open-heart surgery. Most patients spend one to three days in the hospital. The first day or two typically involves close monitoring in an intensive or step-down unit, where the team watches heart rhythm, blood pressure, and the groin access site. Many people go home the next day feeling noticeably better than before, though the full benefit often builds over weeks as the heart adapts to the reduced leak.
Physical recovery is faster than surgical valve repair, which typically requires four to eight weeks of restricted activity. After a MitraClip, most people return to light daily activities within a few days and resume normal routines within one to two weeks. You’ll be prescribed blood-thinning medication for a period after the procedure, and follow-up echocardiograms are scheduled to confirm the clip is holding and the leak remains controlled. Long-term, many patients continue their heart failure medications, though doses may be adjusted as heart function improves.