IVUS Guidance Reduces Target Vessel Failure in Complex Bifurcation PCI

A randomized trial shows IVUS-guided optimization more than halves the 1-year risk of failure in complex double kissing crush procedures.

For Doctors in a Hurry

Researchers investigated whether intravascular ultrasound guidance improves clinical outcomes for patients undergoing double kissing crush stenting for complex coronary bifurcation lesions.
This multicenter randomized trial enrolled 555 patients with complex bifurcations, comparing 277 intravascular ultrasound guided procedures against 278 angiography guided cases.
Ultrasound guidance reduced target vessel failure (HR 0.40; 95% CI 0.23-0.71; P=0.002) compared to angiography alone at one year follow up.
The researchers concluded that clinical benefits resulted from achieving specific optimization targets identified by intravascular ultrasound during the stenting procedure.
Clinicians should utilize intravascular ultrasound to optimize stent expansion and apposition when treating complex bifurcation lesions with the double kissing crush technique.

Optimizing Outcomes in Complex Coronary Bifurcation Interventions

Percutaneous coronary intervention for bifurcation lesions remains technically demanding, often requiring complex two-stent strategies that carry higher risks of restenosis and stent thrombosis compared to simpler lesions [1, 2]. While a provisional single-stent approach is preferred for noncomplex anatomy, complex bifurcations frequently necessitate advanced techniques like the double kissing crush to ensure long-term vessel patency [3, 4]. Current clinical guidelines suggest that intravascular imaging can improve outcomes in high-risk subsets, yet routine adoption remains limited by perceived procedural complexity and economic barriers [5, 6, 7]. Clinicians must frequently decide whether the additional time and resources required for intravascular ultrasound provide a tangible benefit over high-quality angiography alone [8, 9]. A multicenter randomized trial now evaluates whether imaging-guided optimization specifically improves the safety and efficacy of the double kissing crush technique in these challenging anatomical scenarios, offering clear guidance for interventional cardiologists managing complex coronary disease.

Trial Design and Complex Lesion Criteria

The DKCRUSH VIII trial (NCT03770650) was a randomized, open-label study conducted across 24 clinical centers in China to assess imaging guidance in high-stakes coronary interventions. The researchers enrolled 555 patients with clinical indications for percutaneous coronary intervention who met the DEFINITION criteria for complex bifurcation lesions. The DEFINITION system is a validated clinical tool that categorizes bifurcation complexity based on anatomical features like stenosis severity and lesion length. A primary inclusion requirement was a side branch lesion length of 10 mm or greater, a characteristic known to increase technical difficulty and the risk of periprocedural complications. Participants were randomly assigned in a 1:1 ratio to receive either intravascular ultrasound-guided percutaneous coronary intervention (n = 277) or angiography-guided intervention (n = 278). This cohort represented a particularly high-risk population, with 124 patients (44.8%) in the intravascular ultrasound group and 122 patients (43.9%) in the angiography group presenting with bifurcation lesions involving the left main coronary artery, a critical vessel where stent failure can lead to catastrophic ischemic events. To ensure procedural consistency, the double kissing crush technique was utilized in 96.8% of all patients. This specific two-stent strategy involves multiple steps of balloon inflation and stent crushing to maintain side branch patency and optimize the bifurcation scaffold, providing a rigorous baseline to compare the two guidance modalities.

Significant Reduction in One-Year Clinical Events

The researchers evaluated the efficacy of the two guidance strategies by measuring the primary endpoint of target vessel failure at one year. This composite endpoint was defined as the occurrence of cardiac death, target vessel myocardial infarction (a heart attack localized to the territory of the treated artery), or clinically driven target vessel revascularization (the need for a repeat procedure due to recurrent symptoms or ischemia). While previous data have indicated that intravascular ultrasound-guided percutaneous coronary intervention is associated with fewer clinical events than angiography-guided intervention, this trial provides specific evidence for the high-risk double kissing crush technique in complex bifurcations. At the one-year follow-up, a primary endpoint event occurred in 17 patients (6.1%) in the intravascular ultrasound group compared to 41 patients (14.7%) in the angiography group. This difference represented a significant reduction in clinical events, with a hazard ratio of 0.40 (95% CI: 0.23-0.71; P = 0.002). The data demonstrate that using intravascular imaging to guide stent optimization more than halves the risk of target vessel failure in this specific patient population. The observed reduction in the primary endpoint was driven mainly by lower rates of target vessel myocardial infarction and target vessel revascularization, rather than a significant difference in cardiac death alone. For practicing cardiologists, these findings confirm that the upfront investment of time required for imaging translates directly into fewer repeat procedures and ischemic events for the patient over the following year.

The Role of Defined Optimization Targets

The researchers observed that the clinical superiority of the intravascular ultrasound arm was not a byproduct of simply inserting the imaging probe. Instead, the benefit of ultrasound-guided intervention was achieved largely through meeting defined optimization targets (specific, pre-specified criteria for ensuring the stent is fully expanded against the vessel wall and properly sized to the reference diameter). In the context of the double kissing crush technique, these targets provided a standardized framework for the interventionalist to identify and correct mechanical issues such as malapposition (gaps between the stent struts and the arterial wall) or underexpansion that are often invisible on a standard two-dimensional angiogram. For the practicing clinician, these findings dictate that the integration of intravascular ultrasound into complex bifurcation procedures must be active rather than observational. The reduction in the primary endpoint of target vessel failure at one year, which occurred in 17 patients (6.1%) in the ultrasound-guided group compared to 41 patients (14.7%) in the angiography-guided group (HR: 0.40; 95% CI: 0.23-0.71; P = 0.002), was contingent upon the operator using the imaging data to guide further balloon inflations or stent adjustments. By meeting these rigorous optimization targets, physicians can effectively mitigate the risks of myocardial infarction and repeat revascularization in high-risk lesions, particularly those involving the left main coronary artery, which was present in 44.8% of the ultrasound group and 43.9% of the angiography group.

Study Info

IVUS or Angiography Guidance for Percutaneous Coronary Intervention in Complex Coronary Bifurcation Lesions

Xiaofei Gao, Jing Kan, Yan Chen, Xiang Chen, et al.

Journal Journal of the American College of Cardiology

Published March 01, 2026