If a cardiologist has told you that you need either bypass surgery or stents, you are facing one of the most studied decisions in medicine. Large trials have compared the two for decades, and US guidelines now say complex cases should be decided by a heart team, not a single specialist.
A second opinion is a reasonable step when the situation is stable and the stakes are high. This guide explains what the major trials found, what guidelines generally favor in common scenarios, what a second opinion actually needs to see, how a remote review works, and when you should not wait for one at all.
Chest pressure, squeezing, fullness or pain that lasts more than a few minutes or goes away and comes back can be a heart attack, especially with shortness of breath, a cold sweat, nausea or lightheadedness. Call 911 in the US or Canada (123 in Colombia) at the first sign.1 A second opinion is for stable decisions, not emergencies.
Bypass and stents in one minute
Both treatments restore blood flow past narrowed coronary arteries. They do it differently, and that difference drives the trade-offs.
Stents (PCI)
- A catheter through the wrist or groin opens the narrowing with a balloon and a metal mesh tube
- No chest incision, and usually a shorter hospital stay and recovery than surgery
- Treats the narrowed spot itself; new narrowings elsewhere may need more procedures later
Bypass surgery (CABG)
- A surgeon attaches arteries or veins to route blood around the blockages
- Open-chest operation with a hospital stay and a longer recovery
- Bypasses the whole diseased segment, which helps explain its advantage in some complex patterns
For costs and logistics of each in Colombia, see our guides to angioplasty and stent costs and bypass surgery costs. This article is about the decision itself.
What the major trials found
ISCHEMIA: stable disease, and whether to intervene at all
Before "bypass or stents" comes a more basic question: does a procedure help more than medication alone? The ISCHEMIA trial randomized 5,179 patients with stable coronary disease and moderate or severe ischemia on stress testing to an initial invasive strategy (catheterization, then stents or bypass as appropriate) or to an initial strategy of optimal medical therapy, with procedures reserved for patients whose symptoms did not settle.2
In the main analysis, covering about 3.3 years, the main composite outcome (cardiovascular death, heart attack, resuscitated cardiac arrest, or hospitalization for unstable angina or heart failure) occurred in 13.3% of the invasive group and 15.5% of the medication-first group, a difference that was not statistically significant. The invasive approach did improve angina-related quality of life, most clearly in people who had angina daily or weekly at the start.2
Who was not in the trial matters just as much. ISCHEMIA excluded patients with significant left main narrowing, a recent heart attack, a pumping function (ejection fraction) below 35%, advanced kidney disease, or angina that was unacceptable at the start.2 If any of those describe you, its results do not straightforwardly apply.
FREEDOM: diabetes with multivessel disease
FREEDOM compared bypass with stents in about 1,900 people with diabetes and disease in more than one coronary artery. At five years, the combined rate of death, heart attack or stroke was 18.7% after bypass versus 26.6% after stents. Death from any cause was 10.9% versus 16.3%, and heart attack 6.0% versus 13.9%. Stroke was the exception: 5.2% after bypass versus 2.4% after stents.3
SYNTAX: three-vessel and left main disease
The SYNTAX trial randomized about 1,800 patients with three-vessel disease or left main disease to bypass or stents. At ten years, death from any cause was 27% after stents and 24% after bypass overall, a difference that was not statistically significant. Within the three-vessel group it was 28% versus 21%, favoring bypass; within the left main group it was 26% versus 28%, with no significant difference.4 That split is one reason guidelines treat these two anatomies differently.
The trial also gave cardiology the SYNTAX score, a measure of how complex coronary disease is. It is read from the angiogram: each narrowing of 50% or more in a vessel at least 1.5 mm wide is scored, with extra weight for features such as total blockage, branch points, heavy calcium, sharp bends, length over 20 mm, clot and diffuse disease.5 Higher scores mean more complex anatomy.
What guidelines generally favor, by scenario
The 2021 ACC/AHA/SCAI coronary revascularization guideline and the 2023 chronic coronary disease guideline set out the US approach. The table below is a plain-language summary, not a decision tool; your anatomy, heart function, other conditions and preferences can change the answer.67
| Scenario | What guidelines generally favor | Evidence behind it |
|---|---|---|
| Stable disease, symptoms controlled on medication | Guideline-directed medical therapy; no procedure needed just for symptoms | ISCHEMIA; 2023 chronic coronary disease guideline27 |
| Stable disease, lifestyle-limiting angina despite medication | Revascularization recommended to improve symptoms (stents or bypass depending on anatomy) | 2023 chronic coronary disease guideline7 |
| Diabetes with three-vessel disease | Bypass; stents reserved mainly for poor surgical candidates; heart-team decision | FREEDOM; 2021 revascularization guideline36 |
| Significant left main disease | Bypass to improve survival; stents a reasonable alternative in selected patients with low-to-medium anatomic complexity | SYNTAX; 2021 revascularization guideline46 |
| Stable three-vessel disease, normal pumping function | Bypass may be reasonable to improve survival | SYNTAX; 2021 revascularization guideline46 |
| Complex, diffuse multivessel disease (for example SYNTAX score above 33) | Reasonable to choose bypass over stents to improve survival | 2023 chronic coronary disease guideline7 |
| Heart attack in progress or unstable symptoms | Emergency care now; not a case for a second opinion | AHA warning signs1 |
The heart team
When the best treatment is not clear, the 2021 guideline recommends a multidisciplinary heart team, so that the specialists who place stents and the surgeons who perform bypass weigh in together, and it asks that decisions center on the patient's own goals and preferences.6 The same guideline notes that the SYNTAX score has limits, because different readers can score the same angiogram differently, and it recommends the STS score for estimating surgical risk.6 A second opinion is, in effect, a way to get a heart-team review when you are not sure one happened.
Ask your own cardiologist: "Was my case reviewed by both an interventional cardiologist and a cardiac surgeon? What is my SYNTAX score?" The answers tell you how much of the decision has already been tested.
What a second opinion needs: images, not just reports
A second opinion on bypass versus stents is mostly a second reading of your angiogram. A reviewer who has only the cath report is reviewing someone else's interpretation. To calculate a SYNTAX score or judge whether a lesion suits a stent, the reviewer must see the angiogram runs themselves.5
- Angiogram films as DICOM, every run, from the hospital cath lab. Under US law your right of access includes images.8
- The cath report, including any pressure-wire (FFR or iFR) measurements.
- Echocardiogram report and images, since heart pumping function and valve disease shape the choice.
- Stress test or cardiac CT results, if done.
- Your cardiologist's letter stating the recommendation and the reasoning.
- Medication list with doses, allergies, and other conditions (diabetes, kidney function, lung disease, prior stroke), which change surgical risk.
Our separate guide on assembling cardiac records covers how to request each item and in which format.
How a remote second opinion works
- Gather and send the packet. Upload the images and reports through the reviewing hospital's secure portal or link. Keep your originals.
- Ask for a review by both specialties. Request that an interventional cardiologist and a cardiac surgeon both look at the films. A review by only one side is a weaker test of the recommendation.
- Get the answer in writing. Ask for a written opinion that states the recommended option, the SYNTAX score or its equivalent, the reasons, and what would change their view.
- Video consult. A call lets you ask follow-up questions. Bring your list (below) and someone to take notes.
- Take it back to your own cardiologist. If the two opinions differ, ask your cardiologist to look at the written second opinion. A disagreement is useful information, not a failure.
A remote review can confirm or question a recommendation. It cannot examine you, so the treating team will usually repeat some assessment before any procedure. Ask in advance which tests a hospital would redo on arrival.
Questions to ask any reviewing team
- Which option do you recommend, and what in my angiogram drives that?
- What is my SYNTAX score, and what is my STS surgical risk estimate?
- Would medication alone be reasonable for me right now? Why or why not?
- If stents: how many, where, and how likely am I to need another procedure?
- If bypass: which grafts would you plan to use, and how long would I stay in the hospital?
- Does my diabetes, kidney function or heart pumping function change your answer?
Getting the second opinion in Colombia
Colombia has hospitals with both interventional cardiology and cardiac surgery on site, which is what a heart-team review requires. Our list of accredited cardiac hospitals is a starting point. When you ask a hospital for a second opinion, check three things in writing: that both specialties will review your films, what the review costs, and whether that fee is credited if you go on to have treatment there.
Keep the review separate from the sale. A second opinion is most useful when the reviewer has nothing riding on the answer. Ask for the opinion first, and a treatment quote only afterward. If the advice is to have surgery, our article on who should not travel for heart surgery explains when staying close to home is the safer plan.
If you want comparable written quotes after you have a recommendation, you can request a quote. Your cardiologist decides what you need and whether you are fit to travel.
When not to wait
A second opinion takes time: requesting films, uploading, review, a call. That is reasonable for stable disease and a planned procedure. It is not reasonable when symptoms are unstable.
- Call 911 now for chest discomfort lasting more than a few minutes or coming back; discomfort in one or both arms, the back, neck, jaw or stomach; or shortness of breath, cold sweat, nausea or lightheadedness.1
- Tell your cardiologist promptly if your angina is changing: coming on with less effort, more often, or lasting longer.
- Ask your cardiologist directly whether waiting a few weeks for a review is safe in your case. If they say it is not, follow that advice.