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Percutaneous transluminal coronary angioplasty for chronic total coronary arterial occlusion
Insights
Percutaneous transluminal coronary angioplasty (PTCA) for totally occluded coronary arteries shows a 56% initial success rate. While recurrence is higher, successful PTCA effectively relieves angina with low complication risk.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Medicine
Background:
- Chronic total coronary artery occlusion presents a significant challenge in cardiovascular intervention.
- Angiographic collateralization is crucial for recanalization attempts in occluded arteries.
Purpose of the Study:
- To evaluate the efficacy and safety of percutaneous transluminal coronary angioplasty (PTCA) for chronic total coronary occlusions with no visible antegrade flow.
- To assess the long-term outcomes and recurrence rates following successful PTCA in these challenging cases.
Main Methods:
- A series of 100 consecutive patients with chronic total coronary occlusions underwent attempted PTCA using a movable guidewire/dilatation system.
- Angiographic success was defined by recanalization, and patient outcomes were followed for symptom relief and revascularization status.
Main Results:
- The initial success rate for PTCA was 56%, significantly influenced by the duration of occlusion (higher success for shorter durations).
- Complications were minor, with no deaths or emergency bypass surgeries. Long-term follow-up showed subjective improvement in 74% of successful cases.
- Angiographic follow-up revealed a 55% recurrence rate (reocclusion or significant stenosis) after initial success, with some patients requiring repeat procedures or surgery.
Conclusions:
- Percutaneous transluminal coronary angioplasty for chronic total coronary occlusions is feasible, offering effective angina relief with a low complication rate.
- Despite a lower initial success rate and higher recurrence compared to stenotic lesions, PTCA is a viable option for selected patients.
- The duration of occlusion is a critical factor predicting procedural success in recanalizing totally occluded coronary arteries.
Abstract:
Experience is reported with 100 consecutive patients in whom percutaneous transluminal coronary angioplasty (PTCA) was attempted on chronically occluded coronary arteries that had no visible anterograde flow. Ninety-eight patients had angina and all had collateral vessels to the occluded artery on angiography. A movable guidewire/dilatation system was used in all cases. Overall initial PTCA success rate was 56% and was related to duration of occlusion (69% success rate for occlusions of 1 month or less, 50% for 1 to 6 months and 11% after 6 months). Complications were minor; no patient died or required emergency bypass operation. Of the 44 patients in whom PTCA failed, 20 underwent elective bypass surgery for relief of angina and 24 were treated medically. Follow-up at a mean of 8 months (range 1 to 48) was available for 49 of the 56 patients in whom PTCA was successful: 40 had subjective improvement, 6 no change and 3 felt worse. Control angiography was carried out in 40 of the 56 patients with primary success and showed long-term success in 18 and reocclusion or significant stenosis in 22. Of these 22, 11 were successfully treated by a second PTCA, 2 underwent operation and 9 were treated medically. Recanalization of totally occluded coronary arteries with no forward flow has a lower initial success rate (56%) than PTCA for stenoses and the recurrence rate is higher (55%), but effective relief of angina is achieved in successful cases. The risk of serious complications appears to be low.