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Diabetes increases risk of target vessel failure and adverse events during percutaneous coronary interventionTrial shows higher risks for patients with diabetes after heart procedures

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Key Takeaway
Note that patients with diabetes face higher risks of adverse outcomes after PCI regardless of OCT guidance.

The study investigated outcomes in patients undergoing percutaneous coronary intervention, specifically comparing the efficacy of optical coherence tomography guided procedures against angiography guided procedures. The primary focus was on identifying differences in target vessel failure and serious major adverse cardiovascular events between patients with and without diabetes.

Results indicated that patients with diabetes experienced a higher incidence of target vessel failure compared to those without the condition. Furthermore, the study found that serious major adverse cardiovascular events were more frequent in the diabetic cohort. Notably, the use of optical coherence tomography guidance did not significantly reduce the rates of target vessel failure or serious major adverse cardiovascular events in patients with diabetes compared to angiography guidance.

The authors noted that while the trial compared two different imaging modalities, the underlying presence of diabetes remained associated with poorer outcomes. Clinicians should recognize that despite the integration of advanced imaging like optical coherence tomography, patients with diabetes continue to face a higher risk of adverse events following coronary intervention. These findings highlight the need for continued vigilance in managing the complexities of coronary disease in the diabetic population.

People living with diabetes often face unique challenges when managing heart health. When these patients require a procedure called percutaneous coronary intervention (PCI) to open blocked heart arteries, they may be at a higher risk for complications. This research looks at how advanced imaging technology affects outcomes for these specific patients, helping doctors understand the best ways to manage care for those with both heart disease and diabetes.

To investigate this, researchers conducted a randomized controlled trial involving a large group of patients. The study included 1,044 patients with diabetes and 1,443 patients without diabetes. The goal was to see if using a high-resolution imaging technique called optical coherence tomography (OCT) would improve outcomes compared to standard angiography during the heart procedure. The researchers followed the patients for 24 months to track their recovery and health status.

The results showed a clear link between diabetes and higher rates of complications. Patients with diabetes had a higher rate of target vessel failure, which is a measure of how well the artery remains open. Specifically, 9.9% of patients with diabetes experienced this compared to 6.3% of those without diabetes. Additionally, patients with diabetes were more likely to experience serious major adverse cardiovascular events, which are significant heart problems. These events occurred in 5.3% of the diabetic group compared to 2.7% in the non-diabetic group.

While the study compared two different ways of guiding the procedure, it did not find that the advanced imaging (OCT) reduced these risks for people with diabetes. The results showed no significant difference in outcomes when comparing OCT guidance to standard angiography guidance. This means that while the technology is advanced, it did not change the higher risk profile observed in patients with diabetes during the study period.

It is important to remember that this is one study and does not change immediate medical advice. While the data shows a clear link between diabetes and higher risk, the study does not say that the procedure itself is unsafe for those with diabetes. It simply highlights that patients with diabetes may need extra attention and careful monitoring. For now, patients should continue to work closely with their doctors to manage their specific heart health needs based on their individual medical history.

What this means for you:
Patients with diabetes may face higher heart risks after certain procedures, regardless of the imaging used.

Study Details

Study typeRct
Sample sizen = 1,044
EvidenceLevel 2
Follow-up24.0 mo
PublishedSep 2026
View Original Abstract ↓
BACKGROUND: Patients with diabetes are at higher risk for adverse events after percutaneous coronary intervention (PCI) compared with patients without diabetes. OBJECTIVES: This study sought to assess the influence of diabetes and complex lesions on the outcomes of patients undergoing PCI with and without optical coherence tomography (OCT) guidance during a follow-up period of 2 years. METHODS: Patients in ILUMIEN IV randomized to OCT-guided vs angiography-guided PCI were grouped into those with (n = 1,044) and without diabetes (n = 1,443). Study endpoints were target vessel failure (TVF) and serious major adverse cardiovascular events (MACE). RESULTS: After adjustment for differences in clinical and angiographic characteristics, the 2-year rates of both TVF (9.9% vs 6.3%; adjusted HR: 1.48; 95% CI: 1.09-2.02; P = 0.01) and serious MACE (5.3% vs 2.7%; adjusted HR: 1.77; 95% CI: 1.14-2.76; P = 0.01) were increased in diabetic compared with nondiabetic patients, consistently in patients with and without complex lesions (P = 0.22 and 0.14, respectively), although the highest 2-year rates were in patients with diabetes and complex lesions. In all randomized patients, OCT guidance compared with angiography guidance did not reduce TVF or serious MACE. These effects were consistent in patients with and without diabetes (P = 0.41 and 0.20, respectively), and were not modified by treatment of complex lesions. CONCLUSIONS: In the large-scale ILUMIEN IV trial, patients with diabetes remained at increased risk for adverse events after PCI compared with nondiabetic patients despite the use of OCT procedural guidance. Patients with diabetes and complex lesions were at particularly high risk for adverse outcomes after PCI.
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