Intravascular Ultrasound Guidance Improves the Long-term Prognosis in Patients with Unprotected Left Main Coronary
Jian Tian1, Changdong Guan2, Wenyao Wang1
1Department of Cardiology, Fu Wai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
Insights
Intravascular ultrasound (IVUS)-guided stenting for unprotected left main coronary artery disease significantly reduces long-term death and myocardial infarction compared to angiography guidance. This improved prognosis highlights IVUS benefits for complex coronary interventions.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Medical Imaging
Background:
- Unprotected left main coronary artery (LMCA) disease poses significant risks.
- Stenting is a common treatment, but optimal guidance remains crucial for long-term outcomes.
- Conventional angiography guidance may have limitations in complex LMCA interventions.
Purpose of the Study:
- To compare the long-term outcomes of LMCA stenting guided by intravascular ultrasound (IVUS) versus conventional angiography.
- To evaluate the impact of IVUS guidance on the composite of all-cause death and myocardial infarction (MI) at 3 years.
- To assess target vessel revascularization (TVR) rates as a secondary outcome.
Main Methods:
- A retrospective study of 1,899 patients undergoing unprotected LMCA stenting between January 2004 and December 2011.
- Patients were divided into IVUS-guided (n=713) and conventional angiography-guided (n=1186) groups.
- Primary outcome: composite of all-cause death and MI at 3 years. Secondary outcome: TVR at 3 years. Statistical adjustments for baseline risk factors were performed.
Main Results:
- Unadjusted analysis showed a trend towards lower primary outcomes in the IVUS group (6.9% vs. 8.4%, p=0.22), with similar TVR (6.0% vs. 6.0%, p=0.97).
- After risk factor adjustment, IVUS guidance significantly reduced the composite of death and MI (HR: 0.65; 95% CI: 0.50-0.84; p=0.001).
- No significant difference in TVR was observed between the groups after adjustment (HR: 1.09; 95% CI: 0.84-1.42; p=0.53).
Conclusions:
- IVUS guidance is associated with significantly improved long-term prognosis in patients undergoing unprotected LMCA stenting.
- The benefits of IVUS guidance are evident in reducing the incidence of major adverse cardiovascular events.
- IVUS provides superior long-term outcomes compared to conventional angiography for complex LMCA interventions.
Abstract:
This study compared the long term outcomes in patients with unprotected left main coronary artery (LMCA) disease who underwent stenting under the guidance of intravascular ultrasound (IVUS) or conventional angiography at a large single center. The primary outcome was the composite of all-cause death and myocardial infarction (MI) at 3 years. Target vessel revascularization (TVR) at 3 years was one of the secondary outcomes. Between January 2004 and December 2011, a total of 1,899 patients who underwent IVUS-guided (n = 713, 37.5%) or conventional angiography-guided (n = 1186, 62.5%) stenting were included. At 3 years, the unadjusted primary outcome trended lower in the IVUS-guided group versus the angiography-guided (6.9% vs. 8.4%, p = 0.22) although the TVR was similar between two groups (6.0% vs. 6.0%, p = 0.97). However, after adjustment for differences in baseline risk factors, IVUS-guidance was associated with significantly lower incidence of the composite of all-cause death and MI (hazard ratio [HR]: 0.65; 95% confidence interval [CI]: 0.50 to 0.84; p = 0.001), although there was still no significant difference in TVR between the two groups (HR: 1.09; 95% CI: 0.84 to 1.42; p = 0.53). IVUS guidance has benefits in improving the long-term prognosis for unprotected LMCA stenting.
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