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Risk of side branch occlusion during coronary angioplasty
Insights
Percutaneous transluminal coronary angioplasty (PTCA) poses a risk of side branch occlusion, particularly when the side branch originates from the lesion itself. Careful assessment is crucial to minimize these iatrogenic complications during coronary interventions.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Medicine
Background:
- Percutaneous transluminal coronary angioplasty (PTCA) is a common procedure for treating coronary artery stenosis.
- Side branch occlusion is a potential complication during PTCA, which can lead to adverse cardiac events.
- Understanding the risk factors and incidence of side branch occlusion is crucial for improving PTCA outcomes.
Purpose of the Study:
- To assess the incidence and risk factors of side branch occlusion during PTCA.
- To evaluate the clinical consequences of side branch occlusion following PTCA.
- To differentiate the risk of occlusion based on the origin of the side branch relative to the stenosis.
Main Methods:
- Analysis of 600 consecutive PTCA procedures.
- Pre-PTCA angiographic assessment of 557 patients to identify side branches at risk.
- Classification of side branches into two groups based on their origin relative to the stenosis (Group I: originating from the lesion; Group II: originating near the stenosis).
- Assessment of side branch patency post-PTCA by two independent observers using defined criteria for occlusion.
Main Results:
- Of 365 jeopardized side branches in 302 patients, 20 (5.5%) occluded post-PTCA.
- Side branches originating from the lesion segment (Group I) had a significantly higher occlusion rate (14%) compared to those originating nearby (Group II, 1%).
- Occluded side branches were associated with transient adverse events, including chest pain and enzyme elevation, but not decreased exercise tolerance.
Conclusions:
- A significant proportion of patients undergoing PTCA have side branches at risk for iatrogenic occlusion.
- Side branch origin from the lesion itself is a major predictor of occlusion during PTCA.
- Minimizing side branch occlusion is essential for improving the safety and efficacy of PTCA.
Abstract:
To assess the risk of side branch occlusion during percutaneous transluminal coronary angioplasty (PTCA), 600 consecutive procedures were analyzed. On the basis of pre-PTCA angiograms of 557 patients in whom the balloon was actually inflated, 365 side branches in 302 patients (54% of patients) were deemed in jeopardy. A total of 122 side branches in 102 patients (18%) originated from the lesion segment itself, i.e., their take-off was narrowed (Group I, 33% of side branches at risk), whereas 243 side branches in 214 patients (38%) originated from the immediate vicinity of the stenosis in a way that they were subjected to temporary occlusion during balloon dilatation (Group II, 67% of side branches at risk). Patency of side branches was determined by consensus of 2 observers. Criteria for occlusion were disappearance, filling by collaterals, or stagnation of flow. After PTCA, 20 of 365 side branches (5%) were occluded and associated with chest pain in 5 patients, creatine kinase increase in 6, left anterior hemiblock, septal Q waves and transient atrial fibrillation in 1 and non-sustained ventricular tachycardia in 1 of the 20 patients. Exercise tolerance did not decrease. No local predilection for side branch occlusion was evident. Seventeen of 122 side branches (14%) occluded in Group I, compared with 3 of 243 (1%) in Group II (p less than 0.001). Thus, more than half of the patients who underwent PTCA had side branches at risk for iatrogenic occlusion.(ABSTRACT TRUNCATED AT 250 WORDS)