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Urokinase recanalization of chronically occluded aortocoronary vein grafts
1Good Samaritan Hospital, Downers Grove, Illinois 60565, USA.
Insights
This study presents a safe and effective procedure for preserving occluded aortocoronary vein grafts. Strict adherence to protocol improves outcomes, with lysis alone enhancing acute recanalization and six-month patency.
Area of Science:
- Cardiovascular Surgery
- Interventional Cardiology
- Vascular Medicine
Background:
- Aortocoronary vein graft occlusion is a significant clinical problem.
- Preserving the patency of these grafts is crucial for patient outcomes.
- Existing methods for managing occluded grafts have limitations.
Purpose of the Study:
- To evaluate the safety and efficacy of a specific procedure for treating occluded aortocoronary vein grafts.
- To identify factors influencing acute success and long-term patency of treated grafts.
- To assess the potential of this procedure to enable further interventions, such as stenting.
Main Methods:
- A retrospective analysis of patients undergoing a specific intervention for occluded aortocoronary vein grafts.
- Strict adherence to predefined inclusion and exclusion criteria.
- Assessment of acute recanalization rates and six-month patency using defined criteria (e.g., TIMI flow grades).
Main Results:
- The procedure is safe and effective when protocol is strictly followed.
- Acute recanalization is improved by lysis alone achieving TIMI grade 2 or 3 flow.
- Six-month patency is enhanced with lysis-alone TIMI grade 3 flow and intragraft lesions.
- Factors like distal vessel size and initial graft flow may influence patency.
Conclusions:
- The described procedure offers a viable option for preserving occluded aortocoronary vein grafts.
- Strict protocol adherence is key to achieving successful outcomes and minimizing complications.
- This approach may expand patient eligibility for advanced therapies like coronary stenting, improving long-term graft survival.
Abstract:
The problem of aortocoronary vein graft occlusion remains a major clinical challenge. The approach described above offers one method of preserving the life of some occluded vein grafts. Adherence to the protocol, particularly the inclusion and exclusion criteria, is the primary determinant of acute success and lower complications. The following summarizes the experience to date: (1) This procedure is safe and effective when applied to the patients outlined and when the protocol is strictly adhered to. (2) Acute recanalization is improved if TIMI grade 2 or 3 flow is achieved by lysis alone. (3) Acute recanalization is not influenced by (i) age of graft, (ii) duration of occlusion up to 6 months, (iii) size of distal native vessel, (iv) site of stenosis (intragraft versus anastomosis). (4) Six-month patency is greater when (i) TIMI grade 3 flow was achieved by lysis alone, (ii) the site of offending lesion is intragraft versus anastomosis. (5) Six-month patency may be influenced by (i) a size of distal native vessel greater than 2 mm, (ii) graft flow at initial operation greater than 200 ml/min. These studies were performed before the release of the coronary stent. As shown by Tierstein [32], long-term patency can be greatly enhanced by the use of stents. This procedure will presumably permit more patients to become candidates for this new technology and thereby improve the long-term patency and reduce the need for repeat operations.