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Human Internal Mammary Artery (IMA) Transplantation and Stenting: A Human Model to Study the Development of In-Stent Restenosis
Published on: May 9, 2012
Pathology of bailout coronary stenting in human beings
1Department of Cardiovascular Pathology, Armed Forces Institute of Pathology, Washington, DC 20306-6000, USA.
Insights
Bailout coronary stenting successfully treated dissections within the stented area. However, residual dissections in non-stented segments after angioplasty led to adverse outcomes, highlighting the need for improved stent designs.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Pathology
Background:
- Bailout stenting is frequently employed to manage acute or threatened arterial closure following coronary angioplasty.
- Pathologic data on the efficacy and mechanisms of bailout stenting are limited.
Observation:
- Postmortem analysis of 6 cases revealed 20 stents placed for extensive coronary dissection or abrupt vessel closure.
- Histology showed stents were well-apposed, compressing dissections within the stented segment.
- Residual dissection in non-stented arterial segments was observed in 4 of 6 cases.
Findings:
- Bailout stenting effectively restored lumen patency within the stented segments.
- In cases with residual dissection, focal luminal compression or obstruction occurred.
- Complete coverage of dissection by stenting prevented luminal compromise in 2 cases.
Implications:
- Bailout stenting can resolve dissections at the stented site but does not address dissections in adjacent non-stented areas.
- Residual dissections in non-stented segments negatively impact patient outcomes.
- Development of new stents with enhanced trackability and tapering is crucial for managing complex coronary dissections.
Objectives:
The aim of this study was to perform detailed postmortem analysis of bailout coronary stenting to gain insights into the mechanism of success or failure of the procedure. Bailout stenting is increasingly used for acute or threatened arterial closure after angioplasty. Few pathologic data from bailout stenting have been reported.
Methods And Results:
The coronary arteries from 6 cases of bailout stenting were analyzed at autopsy. All stents were placed for extensive coronary dissection or abrupt vessel closure after balloon angioplasty. Twenty stents (11 Palmaz-Schatz and 9 Gianturco-Roubin stents) were placed in 8 coronary arteries, ranging from 1 to 5 stents per artery. After stenting, angiography showed good coronary flow in 3 of 6 cases. All patients died secondary to acute myocardial infarction. Histologically, in all cases, the stents were well opposed to the coronary artery wall, with a focally widely patent lumen by compression of the dissection plane. However, in 4 of 6 cases, there was residual dissection present in the nonstented portion of the arteries proximal, proximal to, and between stents or distal to the stented segment, resulting in focal luminal compression or obstruction. In 2 cases, bailout stenting effectively covered the dissection and prevented luminal compression.
Conclusions:
Bailout stenting for dissection after balloon angioplasty restores lumen patency in the stented segment. Residual dissection in nonstented segments adversely affects outcome and supports the need for continued development of new stents with increased trackability and tapering designs to more effectively treat major coronary dissections.
