Distal reference segment luminal gain following percutaneous coronary intervention for chronic total occlusion
Manabu Ogita1, Junya Ako, Kenichi Sakakura
1Cardiovascular Division, Saitama Medical Center, Jichi Medical University, Saitama, Japan.
Insights
Percutaneous coronary intervention for chronic total occlusion improves blood flow. Left ventricular ejection fraction and minimum lumen diameter predict improved lumen diameter distal to the treated lesion.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Biology
Background:
- Chronic total occlusion (CTO) poses challenges in percutaneous coronary intervention (PCI).
- Assessing changes in distal lumen diameter after CTO PCI is crucial for understanding treatment outcomes.
- The determinants of luminal gain in the distal reference segment following CTO PCI require further investigation.
Purpose of the Study:
- To investigate the predictors of luminal gain in the distal reference segment after percutaneous coronary intervention for chronic total occlusion.
- To evaluate the relationship between baseline clinical and angiographic factors and changes in distal lumen diameter post-PCI.
Main Methods:
- Retrospective analysis of 48 patients undergoing PCI for CTO.
- Collection of clinical and angiographic data at baseline and follow-up (mean 251 days).
- Logistic regression analysis to identify predictors of luminal gain (increase in lumen diameter from post-procedure to follow-up).
Main Results:
- Luminal gain was observed in the distal reference segment in 69% of patients.
- A larger distal reference lumen diameter was noted at follow-up compared to post-procedure (P < 0.05).
- Baseline minimum lumen diameter and left ventricular ejection fraction were significant predictors of luminal gain.
Conclusions:
- Luminal gain occurs in the distal reference segment following PCI for CTO.
- Left ventricular ejection fraction and baseline minimum lumen diameter are key predictors of this gain.
- Left ventricular ejection fraction may influence lumen diameter distal to CTO lesions.
Abstract:
Percutaneous coronary intervention (PCI) for chronic total occlusion (CTO) increases forward blood flow, possibly resulting in an increase in lumen diameter. We investigated the determinants of luminal gain at the distal reference segment following PCI for CTO. Forty-eight consecutive patients who underwent PCI for CTO were included in this study. Clinical and angiographic data were obtained at baseline and follow-up (mean follow-up period: 251 ± 73.6 days). Overall, the reference lumen diameter was 2.53 ± 0.38 mm at post-procedure and 2.38 ± 0.84 mm at follow-up. The distal reference lumen diameter (segment 5 mm distal to the stent) was larger at follow-up than at post-procedure (1.64 ± 0.64 and 1.38 ± 0.51 mm, respectively, P < 0.05). Luminal gain (LG), in the distal reference segment, defined as an increase in lumen diameter from post-procedure to follow-up, was observed in 33 of 48 patients (69%). Univariate and multivariate logistic regression analyses were performed to identify the clinical and angiographic predictors of LG. Minimum lumen diameter and left ventricular ejection fraction at baseline were both significant predictors of LG in univariate and multivariate logistic regression analyses. Luminal gain was observed at the distal reference segment following PCI for CTO. Left ventricular ejection fraction may have an impact on the lumen diameter distal to lesions responsible for CTO.
