A Specific Angiographic View of Left Coronary Artery Bifurcation in the Left Main Percutaneous Coronary Intervention
Samir S A Reis1,2, Roberto V Botelho2, Alexandre Abizaid3
1Federal University of Uberlândia, Minas Gerais, Brazil.
Insights
A new angiographic view effectively visualizes the left main coronary artery (LMCA) bifurcation when standard methods fail. This safe and reproducible projection aids in diagnosing complex coronary artery anatomy.
Area of Science:
- Cardiovascular Imaging
- Interventional Cardiology
- Anatomical Visualization
Background:
- Limited literature exists on specialized angiographic projections for unique anatomies.
- Standard projections are often insufficient for clear visualization of the left main coronary artery (LMCA) bifurcation.
Purpose of the Study:
- To introduce and evaluate a novel right lateral (90-120° RAO) with 30° cranial angiographic projection.
- To improve visualization of the LMCA bifurcation in cases where routine views are inadequate.
Main Methods:
- A prospective study involving 84 patients utilizing the proposed projection.
- Reproducibility assessed by two independent observers using the Prevalence and Bias Adjusted Kappa (PABAK) index.
- Intra/inter-observer agreement quantified with 95% confidence intervals.
Main Results:
- The projection demonstrated efficiency in 79% of cases with significant observer agreement (PABAK=0.76).
- Excellent visualization of the anterior descending artery origin (89%) and intermediate branch (89%) was achieved.
- Good visualization of the circumflex artery origin (83%) was also noted, with high reproducibility.
Conclusions:
- The proposed right lateral (90-120° RAO) with 30° cranial projection is effective, safe, and reproducible.
- This projection is valuable for detailed LMCA bifurcation anatomy assessment in conventional angiography.
- It serves as a crucial working projection during coronary angioplasty when standard views are insufficient.
Objectives:
We propose a right lateral (90-120° RAO) with 30° cranial angiographic view to expose the bifurcation of the left main coronary artery (LMCA) when previously used routine projections were inefficient at clearly showing this region.
Background:
Little has been published in the medical literature regarding angiographic projections dedicated to special anatomies.
Methods:
A total of 84 patients were subjected to the proposed projections. A reproducibility study, conducted with the participation of 2 independent observers, judged the effectiveness of the proposed projection. The Prevalence and Bias Adjusted Kappa (PABAK) index, with a 95% confidence interval (CI), was used to demonstrate the intensity of intra/inter-observer agreement.
Results:
The proposed projection was efficient in 79% of the angiograms, with agreement of 0.76 (0.6-0.9; P ≤ 0.001). The origins and the proximal segments of: the anterior descending coronary artery were exposed in 89% of the angiograms, agreement of 0.86 (0.7-1.0; P ≤ 0.001); the circumflex artery were exposed in 83% of the angiograms, with agreement of 0.72 (0.5-1.0; P ≤ 0.001); and the intermediate branch, when present, were exposed in 89% of the angiograms, agreement of 0.79 (0.6-1.0; P ≤ 0.001).
Conclusion:
The right lateral (90-120° RAO) with 30° cranial projection is effective, safe, and reproducible. In special situations where routine projections fail, this proposed projection can reveal important details of the anatomy of the bifurcation of the LMCA during conventional coronary angiography or be the working projection during coronary angioplasty. (J Interven Cardiol 2016;29:293-299).
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