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© American Heart Association, Inc.
Special Report |
From the Department of Cardiovascular Pathology, Armed Forces Institute of Pathology, Washington, DC (R.V., A.F., F.D.K.), and the Cardiovascular (G.G., G.M., N.G., L.M., M.T., O.V.) and Pathology (T.M.) Departments, Ospedali Riuniti di Bergamo, Bergamo, Italy.
Correspondence to Renu Virmani, MD, Chair, Department of Cardiovascular Pathology, Armed Forces Institute of Pathology, 6825 16th St NW, Washington, DC. E-mail virmani{at}afip.osd.mil
Received December 1, 2003; revision received December 17, 2003; accepted December 29, 2003.
Background The US Food and Drug Administration recently issued a warning of subacute thrombosis and hypersensitivity reactions to sirolimus-eluting stents (Cypher). The cause and incidence of these events have not been determined.
Methods and Results We present findings of a 58-year-old man who died of late stent thrombosis 18 months after receiving 2 Cypher stents for unstable angina. Although angiographic and intravascular ultrasound results at 8 months demonstrated the absence of neointimal formation, vessel enlargement was present. An autopsy showed aneurysmal dilation of the stented arterial segments with a severe localized hypersensitivity reaction consisting predominantly of T lymphocytes and eosinophils.
Conclusions The known pharmacokinetic elution profile of Cypher stents and the presence of polymer fragments surrounded by giant cells and eosinophils suggest that a reaction to the polymer may have caused late stent thrombosis. Careful long-term follow-up of patients with vessel enlargement after Cypher stent placement is recommended.
Key Words: sirolimus stents thrombosis death, sudden
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