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CABG versus PCI in high-risk coronary revascularisation patients shows mixed outcomes over 5 yearsNew Surgery Options For High-Risk Heart Patients

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Key Takeaway
Consider CABG for high-risk patients over 75 without CKD, but note mixed outcomes across other classes.

This observational study emulation used Hospital Episode Statistics data to compare coronary artery bypass grafting (CABG) and percutaneous coronary intervention (PCI) in 103,670 people requiring multivessel revascularisation with at least one of seven high-risk characteristics. The cohort included 62,048 patients (59.9%) who received CABG and 41,622 (40.1%) who received PCI, with a 5-year follow-up.

For patients aged over 75 years without chronic kidney disease (Class 1), CABG showed consistent benefits across primary and secondary outcomes. For the other six patient classes, however, heterogeneity in benefits and harms existed both between and within classes, with mixed results.

Safety and tolerability data were not reported. Key limitations include the observational data source, heterogeneity in benefits and harms across patient classes, and uncertainty for six patient classes. Causation cannot be inferred from this observational emulation.

Practice relevance is limited, though a trial to address uncertainty about CABG versus PCI indications in this population is feasible. The findings suggest CABG may be preferable for Class 1 patients, but certainty is limited by the observational design.

New Surgery Options For High-Risk Heart Patients

Imagine standing in a hospital waiting room. You have severe heart disease. Your doctor must choose between open-heart surgery or a stent. This choice feels huge. It changes your life forever.

But the old way of thinking did not fit everyone. Doctors used to assume one treatment worked for all patients. That assumption was wrong for many people with complex health problems.

This new research changes that view. It looks at people with high-risk traits. These include being over 75 years old or having kidney disease. The study found that benefits and harms varied greatly between groups.

The Old Way Vs The New Way

For years, doctors relied on big studies of average patients. These studies often left out the sickest people. They assumed the results applied to everyone.

But here is the twist. High-risk patients do not respond the same way. Some get better with surgery. Others do better with a stent. The old one-size-fits-all approach failed these patients.

A Factory Analogy For The Heart

Think of the heart like a busy factory. Sometimes the pipes clog up. Surgery clears the whole factory floor. Stents just open one specific pipe.

In a healthy factory, either method works well. But in a damaged factory, the choice matters more. Some machines break down too fast after surgery. Other machines handle the stress of a stent better. The biology is complex and unique to each person.

Researchers looked at over 100,000 patients in the UK. They used a special method called target trial emulation. This method mimics a real clinical trial using existing data.

They found seven distinct patient groups. One group was older than 75 without kidney disease. These patients benefited consistently from surgery. They had lower death rates and fewer hospital stays.

For the other six groups, the results were mixed. Some patients in these groups did better with stents. Others did better with surgery. The difference depended on their specific health profile.

This doesn't mean this treatment is available yet.

The study also planned a new trial. This trial will test the best option for each group directly. It will involve doctors and patients in the planning process.

This news is important for your heart health. If you are high-risk, talk to your doctor about your specific profile. Do not assume the standard advice fits you perfectly.

Doctors can now use this data to guide decisions. They will look at your age, kidney function, and other factors. This leads to more honest conversations about risks and benefits.

This research is not a finished product. It identifies uncertainty that needs solving. The planned trial will take time to run. It will require about 3,000 participants to get clear answers.

Approval for new guidelines will take years. But this work paves the way for better care. Patients will get treatments that truly fit their needs. The future of heart care is more personalized.

Study Details

Study typeRct
Sample sizen = 103,670
EvidenceLevel 2
PublishedMay 2026
View Original Abstract ↓
Aim This study aimed to investigate whether treatment effects (TE) for coronary artery bypass grafting (CABG) versus percutaneous coronary intervention (PCI) were consistent for people requiring coronary revascularisation with high-risk characteristics. Methods We used target trial emulation (TTE) as study design and observational data from Hospital Episode Statistics (HES). The target population was people requiring multivessel coronary revascularisation with at least one of seven high-risk characteristics: age >75 years, female, heart failure, chronic kidney disease, peripheral vascular disease, intermediate frailty risk, or presentation with acute coronary syndrome. The intervention was CABG and the comparison was PCI. Outcomes included all-cause and cardiovascular (CV) mortality, CV hospitalisation, and major adverse cardiovascular events within 5 years of the index procedure. This study included four research stages: (1) latent class analysis (LCA) to identify mutually exclusive patient clusters representing different clinical phenotypes, (2) instrumental variable analysis (IVA) to estimate the TE for the whole population and each patient class; (3) repeating IVA in an emulated trial population obtained by matching a previous cardiac surgery trial enriched for high-risk characteristics to the HES population; (4) co-designed a pragmatic randomised controlled trials (RCT) with multiple stakeholders to address uncertainty identified from the analyses above. Results Of 103,670 patients in the target population, 62,048 (59.9%) received CABG and 41,622 (40.1%) received PCI. Seven patient classes were identified as the best solution from LCA. The emulated trial consisted of 3124 patients, 1,588 (50.8%) in CABG arm and 1,536 (49.2%) in PCI arm. Patients aged >75 years without CKD (Class 1) who received CABG showed consistent benefits in all primary and secondary outcomes. For the other six patient classes, heterogeneity in benefits and harms between CABG and PCI existed both between and within classes in clinical outcomes. An RCT to resolve the remaining uncertainty using Bayesian approach would require 3000 participants to detect a hazard ratio of 0.7 with a family-wise type 1 error rate <5% and 90% power across all seven classes. Conclusion TTE of coronary revascularisation options in people with high-risk characteristics demonstrated mixed benefits and harms both between and within disease phenotypes. A trial to address uncertainty as to the indications for CABG versus PCI in this target population is feasible.
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