Why Heart Surgery Hospital Rankings Don't Tell the Whole Story
When you or a loved one needs heart surgery, one of the first things most people do is search for "best cardiac surgery centers" or "heart surgery hospital rankings." It makes sense. You want the best. You want reassurance that you're making the right choice.
But here is something I tell my patients regularly: the way hospitals are ranked in popular media does not always reflect the quality of cardiac surgical care you will actually receive. Some of the metrics used in widely publicized rankings have little to do with what happens in the operating room. Others are meaningful but easily misunderstood.
As a board-certified cardiovascular and thoracic surgeon, I have operated at academic medical centers and community hospitals. I have seen excellent outcomes in both settings and poor outcomes in both settings. The differences are more nuanced than any single ranking can capture.
This article will walk you through the major quality rating systems, explain what they actually measure, and give you practical guidance on how to evaluate a hospital before your cardiac surgery.
Understanding STS Star Rating Hospitals: The Gold Standard in Cardiac Surgery Quality
The Society of Thoracic Surgeons (STS) maintains the most clinically rigorous quality measurement system in cardiac surgery. If you are going to pay attention to one rating system, this is the one.
How STS Star Ratings Work
The STS collects detailed clinical data from participating cardiac surgery programs across the United States. Using this data, programs are rated on a one-to-three star scale for specific procedure categories:
- Isolated coronary artery bypass grafting (CABG)
- Isolated aortic valve replacement (AVR)
- Combined AVR plus CABG
A three-star STS rating means the program's composite quality score is among the highest in the country. A two-star rating reflects performance that meets expected standards. A one-star rating indicates performance below expected benchmarks.
What makes the STS system valuable is that it adjusts for patient risk. A hospital that operates on sicker, higher-risk patients is not penalized simply because those patients have higher complication rates. The composite score accounts for risk-adjusted mortality, complication rates, and adherence to evidence-based care processes such as appropriate use of internal mammary artery grafts during CABG and timely administration of perioperative medications.
Limitations You Should Know
The STS star rating system is voluntary. Not all hospitals participate, and not all participating hospitals consent to public reporting of their results. A hospital without a visible STS rating is not necessarily a bad hospital — it may simply have opted out of public disclosure.
Additionally, STS ratings are procedure-specific. A hospital may earn three stars for isolated CABG but have no rating for valve surgery if their volume in that category is too low. This matters if your operation is a complex multi-valve procedure or an aortic aneurysm repair — procedures for which STS star ratings may not be available.
You can search for STS star rating hospitals at the STS public reporting website. I encourage every patient considering cardiac surgery to check this resource.
U.S. News, Healthgrades, and Leapfrog: What These Popular Rankings Actually Measure
Let me be direct: popular hospital ranking systems like U.S. News & World Report, Healthgrades, and Leapfrog serve a purpose, but they should not be the primary driver of your cardiac surgery decision.
U.S. News & World Report
The U.S. News "Best Hospitals" list is probably the most recognized ranking in the country. Their cardiology and heart surgery ranking incorporates outcomes data, patient experience scores, volume, nurse staffing ratios, and — importantly — reputation surveys sent to physicians. That reputation component historically accounted for a significant portion of the overall score. A hospital can rank highly in part because cardiologists across the country have heard of it, not necessarily because its surgical results are superior.
In recent years, U.S. News has adjusted its methodology to weight outcomes more heavily, which is a positive development. But patients should understand that this is still a composite score mixing clinical and non-clinical factors.
Healthgrades
Healthgrades uses administrative claims data — essentially billing records — to calculate risk-adjusted mortality and complication rates. The advantage is broad coverage: nearly all hospitals are included. The disadvantage is that billing data lacks the clinical granularity of a registry like STS. Important variables that affect surgical risk, such as the degree of left ventricular dysfunction, frailty, or porcelain aorta, are not well captured in billing codes.
Leapfrog Group
Leapfrog focuses on patient safety metrics: infection rates, medication errors, ICU staffing, and similar indicators. These are important aspects of hospital quality, but they reflect general hospital safety rather than cardiac surgery-specific performance.
My recommendation: Use popular rankings as a starting point, but do not stop there. Cross-reference with STS data and, critically, ask about surgeon-specific outcomes when possible.
Beyond Ratings: How to Identify the Best Cardiac Surgery Centers for Your Specific Operation
Rankings and star ratings give you a population-level view of hospital performance. But your surgery will be performed by a specific surgeon, assisted by a specific team, in a specific operating room. Here are the factors I believe matter most:
1. Procedural Volume — for Both the Hospital and the Surgeon
Decades of research consistently show that higher surgical volume is associated with better outcomes in cardiac surgery. This is true at both the hospital level and the individual surgeon level. ACC/AHA guidelines recommend that hospitals performing CABG maintain a minimum annual volume, and the data supporting volume-outcome relationships is particularly strong for complex procedures like aortic root replacements, reoperative surgery, and combined procedures.
Ask directly: How many of these specific operations does this surgeon perform per year? How many does this hospital perform? There is no magic number, but a surgeon who performs your specific procedure regularly — not just occasionally — is more likely to deliver a good result.
2. Availability of a Heart Team
Modern cardiac surgery decisions should involve a multidisciplinary heart team: cardiac surgeons, interventional cardiologists, imaging specialists, and anesthesiologists with cardiac expertise. This is particularly important for decisions like aortic valve replacement (TAVR vs. SAVR), complex coronary artery disease management, and combined valve-plus-coronary procedures.
If a hospital does not have a formal heart team structure, that is a red flag — especially for complex cases.
3. Comprehensive Postoperative Care Infrastructure
Outcomes in cardiac surgery depend heavily on what happens after the operation. Look for programs with dedicated cardiothoracic ICUs staffed by intensivists experienced in managing post-cardiac surgery patients, robust cardiac rehabilitation programs, and structured follow-up pathways. A beautiful operation means little if postoperative complications are managed poorly.
4. The Program's Willingness to Be Transparent
High-quality programs are typically willing to share their outcomes data openly. If a surgeon or hospital is reluctant to discuss their mortality rates, complication rates, or STS scores, that reluctance itself is information worth considering.
5. Your Gut Feeling About Communication
This may seem unscientific, but it matters. Did the surgeon explain your options clearly? Did the team answer your questions without rushing? Were alternatives to surgery discussed? A program that communicates well is more likely to coordinate your care well. Studies in patient safety literature consistently link communication quality to clinical outcomes.
How a Second Opinion Helps You Navigate Hospital Quality Decisions
Evaluating hospital quality is difficult even for physicians, let alone patients under the stress of a new cardiac diagnosis. A cardiac surgery second opinion from an independent surgeon can help you assess whether the recommended procedure is appropriate, whether the proposed surgical approach reflects current best practices, and whether you might benefit from being treated at a different type of center.
At WhiteGloveMD, I review your complete medical records — including catheterization films, echocardiograms, CT scans, and operative notes — and provide a detailed assessment of your case. This includes evaluating whether the surgical plan is sound and, when relevant, whether your case complexity warrants a higher-volume or more specialized center.
I also encourage patients to use our free cardiac surgery risk calculator as a starting point for understanding their individual surgical risk profile. Knowing your estimated risk helps you have a more informed conversation with your surgical team and puts rankings and ratings into personal context.
When Center Selection Matters Most
Not every cardiac surgery requires the most specialized center in the country. A straightforward, first-time three-vessel CABG in an otherwise healthy patient can be performed with excellent results at many well-run community cardiac surgery programs. But certain scenarios demand careful center selection:
- Reoperative cardiac surgery (second or third open-heart operation)
- Complex aortic surgery including root replacement or arch reconstruction
- Multi-valve surgery, particularly when combined with CABG or aortic procedures
- High-risk TAVR or SAVR in patients with significant comorbidities
- Mechanical circulatory support or heart transplant evaluation
In these situations, the difference between an adequate program and an excellent one can be measured in survival.
Practical Steps Before Choosing Your Cardiac Surgery Hospital
Here is a checklist you can use right now:
- Check the STS public reporting database for your hospital's star rating in the specific procedure you need.
- Ask your surgeon about their personal volume and outcomes for your specific operation.
- Verify that a heart team approach is used for treatment decisions at the hospital.
- Look beyond the "Best Of" lists. Cross-reference multiple sources rather than relying on any single ranking.
- Consider geography thoughtfully. Traveling for a more experienced center may make sense for complex cases. For lower-risk operations, a strong local program with good outcomes may be the better choice, especially when factoring in family support and postoperative follow-up.
- Get an independent second opinion. An outside surgeon reviewing your case has no institutional bias and can offer a frank assessment of both the treatment plan and the proposed center.
You deserve to make this decision with clear, unbiased information. Hospital marketing budgets are large. Quality data can be opaque. But the information is available if you know where to look and what questions to ask.
If you are facing a cardiac surgery recommendation and want an independent, expert review of your case — including whether your hospital and surgical plan are the right fit — a WhiteGloveMD second opinion can help. I personally review every case, and my goal is simple: make sure you have the information you need to make the best decision for your heart and your life.