Success Rate of Percutaneous Coronary Intervention (PCI)
Contemporary PCI achieves procedural success rates of 90-95% overall, with angiographic success exceeding 95% in most cases. 1, 2
Overall Success Rates
Modern PCI demonstrates consistently high success rates across multiple large registries:
- Angiographic success: 93-99% for stented lesions in contemporary practice 3, 4
- Procedural success: 90-95% (defined as angiographic success without death, MI, or emergency CABG) 1, 2
- Clinical success: 92.8% when performed for Class I indications per ACC/AHA guidelines 5
These rates represent substantial improvement from the early balloon angioplasty era (72-74% success) due to advances in stent technology, adjunctive pharmacotherapy, and operator experience 1, 2.
Success Rates by Clinical Context
Standard Lesions
- De novo native coronary lesions with stenting: 97.5-99% angiographic success 3, 4
- Non-stented lesions: 86% success rate 3
Complex Lesion Subsets
Chronic Total Occlusions (CTO):
- Overall CTO success: 77-82% with contemporary techniques 6, 7
- CTO in STEMI setting: >90% success rate 1
- Conventional CTO: 65% average success 1
- Success rates are significantly lower than standard lesions due to technical challenges 8
Elderly Patients (≥65 years):
- Overall success: 93.5-98% in patients >65 years 9, 8
- Success rates remain high even in patients >75 years (95-98%) with minimal difference compared to younger patients 9, 8
- Complication rates are higher despite similar success rates 9
Unprotected Left Main Disease:
- Procedural success: 95-98% with contemporary stenting techniques 1
- Technical success is high but long-term outcomes vary by lesion complexity and SYNTAX score 10
Complication Rates (Contemporary Era)
Major complications have declined substantially:
- Mortality: 0.36-1.27% across registries 3, 4
- Emergency CABG: 0.2-0.5% (down from 5.8% in early era) 3, 4
- Myocardial infarction: 1.2-2.8% periprocedural 3
- Stroke: <0.01% 6
CTO-specific complications:
Factors Affecting Success
Predictors of lower success rates include:
- Chronic total occlusions >3 months duration 3, 7
- Excessive calcification 11
- Absence of tapered stump 7, 11
- Excessive tortuosity 11
- Degenerated saphenous vein grafts 3
- Advanced age (though success remains high) 9
- Multivessel disease 7
Success by ACC/AHA Indication Class
Success rates correlate with guideline-recommended indications:
- Class I indications: 92.8% clinical success 5
- Class IIa indications: 91.7% 5
- Class IIb indications: 89% 5
- Class III indications: 85.5% 5
This gradient demonstrates that evidence-based patient selection significantly impacts outcomes 5.
Key Clinical Considerations
Procedural success is defined as achieving angiographic success (residual stenosis <20% with TIMI 3 flow for stented lesions, or >20% reduction with <50% residual for non-stented) without death, MI, or emergency CABG. 3, 4
Important caveats:
- Success rates decline with unsuccessful wire crossing in CTOs, where complication rates increase substantially (perforation 10.7% vs 3.65%, tamponade 1.65% vs 0%) 6
- Pre-procedural coronary CTA for complex CTOs can improve success rates from 63% to 90% 12
- Failed PCI procedures carry significantly higher one-year MACE rates (18.8% vs 1.8%) 7