Interventional cardiologists constantly seek to optimize outcomes in challenging cases. Specifically, the recent IVUS-CHIP trial provided new data on IVUS-guided complex PCI for high-risk patients. While previous studies suggested clear benefits, this international trial highlights some unexpected outcomes. Consequently, these findings challenge the routine assumption that intravascular imaging always improves short-term clinical results.
The Trial Design and Methodology
Specifically, the IVUS-CHIP trial enrolled 2,020 patients across multiple international centers. Researchers focused on complex, high-risk procedures involving challenging coronary anatomy. One group received IVUS-guided PCI with strict stent-optimization criteria. Meanwhile, the other group underwent standard angiography-guided procedures. Furthermore, doctors monitored the primary endpoint of target-vessel failure for a median of 19 months. Therefore, this robust study provides a comprehensive look at modern interventional strategies.
Outcomes of IVUS-guided complex PCI
Surprisingly, the results did not show a reduction in target-vessel failure with imaging guidance. In the IVUS-guided group, the failure rate reached 13.9%. In contrast, the angiography group experienced a rate of 11.1%. Moreover, the statistical analysis yielded a p-value of 0.08, which indicates no significant difference between strategies. Additionally, the IVUS procedures took significantly longer to perform than those guided by angiography alone. However, procedural complications remained similar between both cohorts throughout the follow-up period.
Analyzing the Clinical Implications
These findings differ from other recent trials that showed benefits for intravascular imaging. Thus, the medical community must evaluate why these results vary across different patient populations. For instance, the IVUS-CHIP study utilized specific practice patterns that might influence the comparison. Despite the lack of significance in this trial, many guidelines still recommend imaging for anatomically complex lesions. Ultimately, clinicians should balance procedural complexity with the potential for optimization when selecting their imaging tools.
Frequently Asked Questions
Q1: What was the primary endpoint in the IVUS-CHIP trial?
Researchers defined the primary endpoint as target-vessel failure. This included a composite of death from cardiac causes, target-vessel myocardial infarction, or clinically indicated revascularization.
Q2: Did IVUS-guided PCI improve safety outcomes in this study?
No, the trial found that procedural complications and adverse events were similar between the two groups. Specifically, complications occurred in 11.3% of IVUS cases and 10.2% of angiography cases.
Q3: How did procedure times compare between the two groups?
The IVUS-guided procedures averaged 88.8 minutes. In comparison, the angiography-guided procedures were shorter, averaging 66.2 minutes.
References
- Diletti R et al. Intravascular Ultrasound-Guided or Angiography-Guided Complex High-Risk PCI. N Engl J Med. 2026 Mar 30. doi: 10.1056/NEJMoa2601521. PMID: 41911016.
- Lee JM et al. Intravascular Imaging–Guided or Angiography-Guided Complex PCI. N Engl J Med. 2023;388(18):1668-1679.
- Carvalho PEP et al. IVUS, OCT Each Bring Something to the Table for PCI in Complex Lesions: Meta-analysis. JACC Cardiovasc Interv. 2026 Jan 20.