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Early and late morphologic changes in human coronary arteries after percutaneous transluminal coronary angioplasty
Insights
Percutaneous transluminal coronary angioplasty (PTCA) can cause early arterial narrowing due to plaque and dissection. Late PTCA sites show significant plaque buildup, but no procedure-related lesions were found.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Pathology
Background:
- Percutaneous transluminal coronary angioplasty (PTCA) is a common procedure for coronary artery disease.
- Understanding the long-term effects of PTCA on coronary arteries is crucial for patient outcomes.
- Histological analysis provides detailed insights into tissue changes post-intervention.
Purpose of the Study:
- To investigate the morphologic changes at PTCA sites in patients undergoing subsequent coronary procedures or experiencing adverse events.
- To differentiate between early and late histological findings following PTCA.
Main Methods:
- Retrospective analysis of clinical and morphologic data from 6 male patients.
- Histological examination of coronary arteries at PTCA sites (early: 4 hours-7 days; late: 80-150 days).
- Coronary angiography and measurement of trans-stenotic gradients.
Main Results:
- Early PTCA sites (n=3) showed significant narrowing (76-95%) by atherosclerotic plaque, with dissection or hematoma.
- Late PTCA sites (n=3) demonstrated substantial luminal diameter increase post-PTCA but significant late narrowing (76-95%) due to plaque.
- No PTCA-induced lesions (e.g., cracks) were identified histologically in late cases.
Conclusions:
- Early PTCA complications include plaque formation and dissection at the intervention site.
- Late PTCA sites are characterized by significant atherosclerotic plaque accumulation, independent of procedure-related lesions.
- The study highlights the dynamic and complex nature of coronary artery response to PTCA over time.
Abstract:
Certain clinical and morphologic observations are described in 6 men who had percutaneous transluminal coronary angioplasty (PTCA) of the left anterior descending (LAD) or right (R) coronary artery early (4 hours to 7 days) or late (80, 90, and 150 days) before coronary endarterectomy and aortocoronary bypass grafting or death. Histologically, each of the 3 early patients had the site of PTCA narrowed 76-95% in cross-sectional area by atherosclerotic plaque, and each had either coronary dissection or plaque hematoma or both at the site of PTCA. Each of the 3 late patients had a decrease in the mean trans-stenotic coronary gradient (17, 38, and 43 mmHg, respectively) and an angiographic increase in the LAD luminal diameter (55, 60, and 65%, respectively) at the time of PTCA. At necropsy, 80, 90, and 150 days later, the LAD coronary artery in the area of the PTCA in each patient was narrowed 76-95% in cross-sectional area by plaques. No cracks in plaques or other lesions which may have resulted from the PTCA procedure were identified histologically in the LAD coronary artery of any late patient.